一步一步学ZedBoard & Zynq(四):基于AXI Lite 总线的从设备IP设计 转载

文章来源

http://www.cnblogs.com/surpassal/archive/2012/10/09/Zynq_Lab4.html

本小节通过使用XPS中的定制IP向导(ipwiz),为已经存在的ARM PS 系统添加用户自定IP(Custom IP ),了解AXI Lite IP基本结构,并掌握AXI Lite IP的定制方法,为后续编写复杂AXI IP打下基础。同时本小节IP定制方法同样适用于MicroBlaze处理系统。

本小节定制的是简单LED的IP,只有一个数据寄存器,向其写值就可以控制8个LED相应亮灭。

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硬件平台:Digilent ZedBoard

开发环境:Windows XP 32 bit

软件: XPS 14.2 +SDK 14.2

一、创建ARM PS系统

同前面几节一样,首先使用XPS创建ARM PS系统。需要注意的是,在选择外设时,同样不要添加任何外设

二、定制AXI IP

ARM PS系统创建结束后,就可以开始定制用户自定义IP。XPS提供了Create or Import Peripheral Wizward 向导,使得用户自定义IP的创建变得非常简单。当然在熟悉了AXI IP核结构和代码编写规则后,可以直接编写自己的IP核而不使用向导。这里采用向导方式。

1、产生AXI IP外设模版

Hardware->Create or Import Peripheral Wizward ,启动向导

欢迎界面

选择从模板创建新外设

默认是将外设直接包含到当前XPS工程中

填入外设名。注意必须都是小写。这里我们建立的是my_axi_ip。下面是版本控制,可以根据需要修改。同时面板的最下方还提示了将创建名为my_axi_ip_v1_00_a的库(其实就是一个目录),所有实现这个IP的HDL文件都在这个库中。

接下来要选择外设总线的类型。AXI4_Lite为最基本的AXI 总线,用于简单处理,所有空间访问都是通过地址/寄存器方式访问,不支持突发;AXI4是标准AXI4总线标准,支持突然,支持高速;AXI4_Stream专门为数据流而设计。

在IPIF (IP 接口) 配置,这里配置接口的一些属性,如是否是AXI 主/从设备等。我们所定制的IP是一个从设备,因而不需要使用主设备接口。

选择需啊哟的寄存器数量。因为我们只需要一个数据寄存器,这里选1。

接下来就是IPIC(IP 互联),也就是IP的接口信号。以BUS2开头的信号,意味对IP来说,这些信号是输入信号;同样IP2BUS意味着输出信号。

这里一些信号做一些说明。

BUS2IP_WrCE(Write Chip Enable,写使能)

Active high chip enable bus to the user logic. These chip enables are asserted only during active write transaction requests with the target address space and in conjunction with the corresponding sub-address within the space. Typically used for user logic writable registers selection.

BUS2IP_Data(Write Data,写数据)

Write data bus to the user logic. Write data is accepted by the user logic during a write operation by assertion of the write acknowledgement signal and the rising edge of the Bus2IP_Clk.

BUS2IP_BE(Byte Enable,字节使能)

Byte Enable qualifiers for the requested read or write operation to the user logic. A bit in the Bus2IP_BE set to ‘1‘ indicates that the associated byte lane contains valid data. For example, if Bus2IP_BE = 0011, this indicates that byte lanes 2 and 3 contain valid data.

IPBUS2_RdAck(Read Acknowledgement,读反馈)

Active high read data qualifier providing the read acknowledgement from the user logic. Read data on the IP2Bus_Data bus is deemed valid at the rising edge of the Bus2IP_Clk and IP2Bus_RdAck asserted high by the user logic.

接下来需要使用需要使用BFM (Bus Functional Models, 总线功能模型)对外设进行仿真。本例IP很简单,不要使用。

最后,需要选择HDL类型、ISE工程支持和软件驱动模板。因为我比较习惯使用verilog,因而使用verilog模板。需要说明的是,IP接口仍然是VHDL编写,只是用户逻辑改用verilog。如果不需要使用软件驱动模板的话,可以不选上。这里选上了,但是后续编程的时候我并没有用。

最后给出了外设的信息summary。支持,my_axi_ip"外壳"基本完成。后续我们只需要对user_logic进行编写,并修改元件引脚即可。

2、编写IP

修改.mpd文件,在目录

Lab4\pcores\my_axi_ip_v1_00_a\data\

 1 ###################################################################
 2 ##
 3 ## Name     : my_axi_ip
 4 ## Desc     : Microprocessor Peripheral Description
 5 ##          : Automatically generated by PsfUtility
 6 ##
 7 ###################################################################
 8
 9 BEGIN my_axi_ip
10
11 ## Peripheral Options
12 OPTION IPTYPE = PERIPHERAL
13 OPTION IMP_NETLIST = TRUE
14 OPTION HDL = MIXED
15 OPTION IP_GROUP = MICROBLAZE:USER
16 OPTION DESC = MY_AXI_IP
17 OPTION ARCH_SUPPORT_MAP = (others=DEVELOPMENT)
18
19
20 ## Bus Interfaces
21 BUS_INTERFACE BUS = S_AXI, BUS_STD = AXI, BUS_TYPE = SLAVE
22
23 ## Generics for VHDL or Parameters for Verilog
24 PARAMETER C_S_AXI_DATA_WIDTH = 32, DT = INTEGER, BUS = S_AXI, ASSIGNMENT = CONSTANT
25 PARAMETER C_S_AXI_ADDR_WIDTH = 32, DT = INTEGER, BUS = S_AXI, ASSIGNMENT = CONSTANT
26 PARAMETER C_S_AXI_MIN_SIZE = 0x000001ff, DT = std_logic_vector, BUS = S_AXI
27 PARAMETER C_USE_WSTRB = 0, DT = INTEGER
28 PARAMETER C_DPHASE_TIMEOUT = 8, DT = INTEGER
29 PARAMETER C_BASEADDR = 0xffffffff, DT = std_logic_vector, MIN_SIZE = 0x100, PAIR = C_HIGHADDR, ADDRESS = BASE, BUS = S_AXI
30 PARAMETER C_HIGHADDR = 0x00000000, DT = std_logic_vector, PAIR = C_BASEADDR, ADDRESS = HIGH, BUS = S_AXI
31 PARAMETER C_FAMILY = virtex6, DT = STRING
32 PARAMETER C_NUM_REG = 1, DT = INTEGER
33 PARAMETER C_NUM_MEM = 1, DT = INTEGER
34 PARAMETER C_SLV_AWIDTH = 32, DT = INTEGER
35 PARAMETER C_SLV_DWIDTH = 32, DT = INTEGER
36 PARAMETER C_S_AXI_PROTOCOL = AXI4LITE, TYPE = NON_HDL, ASSIGNMENT = CONSTANT, DT = STRING, BUS = S_AXI
37
38 ## Ports
39 PORT LED = "", DIR = O, VEC = [7:0]
40 PORT S_AXI_ACLK = "", DIR = I, SIGIS = CLK, BUS = S_AXI
41 PORT S_AXI_ARESETN = ARESETN, DIR = I, SIGIS = RST, BUS = S_AXI
42 PORT S_AXI_AWADDR = AWADDR, DIR = I, VEC = [(C_S_AXI_ADDR_WIDTH-1):0], ENDIAN = LITTLE, BUS = S_AXI
43 PORT S_AXI_AWVALID = AWVALID, DIR = I, BUS = S_AXI
44 PORT S_AXI_WDATA = WDATA, DIR = I, VEC = [(C_S_AXI_DATA_WIDTH-1):0], ENDIAN = LITTLE, BUS = S_AXI
45 PORT S_AXI_WSTRB = WSTRB, DIR = I, VEC = [((C_S_AXI_DATA_WIDTH/8)-1):0], ENDIAN = LITTLE, BUS = S_AXI
46 PORT S_AXI_WVALID = WVALID, DIR = I, BUS = S_AXI
47 PORT S_AXI_BREADY = BREADY, DIR = I, BUS = S_AXI
48 PORT S_AXI_ARADDR = ARADDR, DIR = I, VEC = [(C_S_AXI_ADDR_WIDTH-1):0], ENDIAN = LITTLE, BUS = S_AXI
49 PORT S_AXI_ARVALID = ARVALID, DIR = I, BUS = S_AXI
50 PORT S_AXI_RREADY = RREADY, DIR = I, BUS = S_AXI
51 PORT S_AXI_ARREADY = ARREADY, DIR = O, BUS = S_AXI
52 PORT S_AXI_RDATA = RDATA, DIR = O, VEC = [(C_S_AXI_DATA_WIDTH-1):0], ENDIAN = LITTLE, BUS = S_AXI
53 PORT S_AXI_RRESP = RRESP, DIR = O, VEC = [1:0], BUS = S_AXI
54 PORT S_AXI_RVALID = RVALID, DIR = O, BUS = S_AXI
55 PORT S_AXI_WREADY = WREADY, DIR = O, BUS = S_AXI
56 PORT S_AXI_BRESP = BRESP, DIR = O, VEC = [1:0], BUS = S_AXI
57 PORT S_AXI_BVALID = BVALID, DIR = O, BUS = S_AXI
58 PORT S_AXI_AWREADY = AWREADY, DIR = O, BUS = S_AXI
59
60 END

其中,第39行

PORT LED = "", DIR = O, VEC = [7:0]

是我们添加上的,表明我们为其添加了一个名为LED的端口,方向是输出,长度是8位。其他行代码为默认,不需要修改。

修改用户逻辑,在

Lab4\pcores\my_axi_ip_v1_00_a\hdl\verilog\user_logic.v

  1 //----------------------------------------------------------------------------
  2 // user_logic.v - module
  3 //----------------------------------------------------------------------------
  4 //
  5 // ***************************************************************************
  6 // ** Copyright (c) 1995-2012 Xilinx, Inc.  All rights reserved.            **
  7 // **                                                                       **
  8 // ** Xilinx, Inc.                                                          **
  9 // ** XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS"         **
 10 // ** AS A COURTESY TO YOU, SOLELY FOR USE IN DEVELOPING PROGRAMS AND       **
 11 // ** SOLUTIONS FOR XILINX DEVICES.  BY PROVIDING THIS DESIGN, CODE,        **
 12 // ** OR INFORMATION AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE,        **
 13 // ** APPLICATION OR STANDARD, XILINX IS MAKING NO REPRESENTATION           **
 14 // ** THAT THIS IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT,     **
 15 // ** AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE      **
 16 // ** FOR YOUR IMPLEMENTATION.  XILINX EXPRESSLY DISCLAIMS ANY              **
 17 // ** WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE               **
 18 // ** IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR        **
 19 // ** REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF       **
 20 // ** INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS       **
 21 // ** FOR A PARTICULAR PURPOSE.                                             **
 22 // **                                                                       **
 23 // ***************************************************************************
 24 //
 25 //----------------------------------------------------------------------------
 26 // Filename:          user_logic.v
 27 // Version:           1.00.a
 28 // Description:       User logic module.
 29 // Date:              Tue Oct 09 18:28:06 2012 (by Create and Import Peripheral Wizard)
 30 // Verilog Standard:  Verilog-2001
 31 //----------------------------------------------------------------------------
 32 // Naming Conventions:
 33 //   active low signals:                    "*_n"
 34 //   clock signals:                         "clk", "clk_div#", "clk_#x"
 35 //   reset signals:                         "rst", "rst_n"
 36 //   generics:                              "C_*"
 37 //   user defined types:                    "*_TYPE"
 38 //   state machine next state:              "*_ns"
 39 //   state machine current state:           "*_cs"
 40 //   combinatorial signals:                 "*_com"
 41 //   pipelined or register delay signals:   "*_d#"
 42 //   counter signals:                       "*cnt*"
 43 //   clock enable signals:                  "*_ce"
 44 //   internal version of output port:       "*_i"
 45 //   device pins:                           "*_pin"
 46 //   ports:                                 "- Names begin with Uppercase"
 47 //   processes:                             "*_PROCESS"
 48 //   component instantiations:              "<ENTITY_>I_<#|FUNC>"
 49 //----------------------------------------------------------------------------
 50
 51 `uselib lib=unisims_ver
 52 `uselib lib=proc_common_v3_00_a
 53
 54 module user_logic
 55 (
 56   // -- ADD USER PORTS BELOW THIS LINE ---------------
 57   LED,
 58   // -- ADD USER PORTS ABOVE THIS LINE ---------------
 59
 60   // -- DO NOT EDIT BELOW THIS LINE ------------------
 61   // -- Bus protocol ports, do not add to or delete
 62   Bus2IP_Clk,                     // Bus to IP clock
 63   Bus2IP_Resetn,                  // Bus to IP reset
 64   Bus2IP_Data,                    // Bus to IP data bus
 65   Bus2IP_BE,                      // Bus to IP byte enables
 66   Bus2IP_RdCE,                    // Bus to IP read chip enable
 67   Bus2IP_WrCE,                    // Bus to IP write chip enable
 68   IP2Bus_Data,                    // IP to Bus data bus
 69   IP2Bus_RdAck,                   // IP to Bus read transfer acknowledgement
 70   IP2Bus_WrAck,                   // IP to Bus write transfer acknowledgement
 71   IP2Bus_Error                    // IP to Bus error response
 72   // -- DO NOT EDIT ABOVE THIS LINE ------------------
 73 ); // user_logic
 74
 75 // -- ADD USER PARAMETERS BELOW THIS LINE ------------
 76 // --USER parameters added here
 77 // -- ADD USER PARAMETERS ABOVE THIS LINE ------------
 78
 79 // -- DO NOT EDIT BELOW THIS LINE --------------------
 80 // -- Bus protocol parameters, do not add to or delete
 81 parameter C_NUM_REG                      = 1;
 82 parameter C_SLV_DWIDTH                   = 32;
 83 // -- DO NOT EDIT ABOVE THIS LINE --------------------
 84
 85 // -- ADD USER PORTS BELOW THIS LINE -----------------
 86 output        [7:0]                        LED;
 87 // -- ADD USER PORTS ABOVE THIS LINE -----------------
 88
 89 // -- DO NOT EDIT BELOW THIS LINE --------------------
 90 // -- Bus protocol ports, do not add to or delete
 91 input                                     Bus2IP_Clk;
 92 input                                     Bus2IP_Resetn;
 93 input      [C_SLV_DWIDTH-1 : 0]           Bus2IP_Data;
 94 input      [C_SLV_DWIDTH/8-1 : 0]         Bus2IP_BE;
 95 input      [C_NUM_REG-1 : 0]              Bus2IP_RdCE;
 96 input      [C_NUM_REG-1 : 0]              Bus2IP_WrCE;
 97 output     [C_SLV_DWIDTH-1 : 0]           IP2Bus_Data;
 98 output                                    IP2Bus_RdAck;
 99 output                                    IP2Bus_WrAck;
100 output                                    IP2Bus_Error;
101 // -- DO NOT EDIT ABOVE THIS LINE --------------------
102
103 //----------------------------------------------------------------------------
104 // Implementation
105 //----------------------------------------------------------------------------
106
107   // --USER nets declarations added here, as needed for user logic
108
109   // Nets for user logic slave model s/w accessible register example
110   reg        [C_SLV_DWIDTH-1 : 0]           slv_reg0;
111   wire       [0 : 0]                        slv_reg_write_sel;
112   wire       [0 : 0]                        slv_reg_read_sel;
113   reg        [C_SLV_DWIDTH-1 : 0]           slv_ip2bus_data;
114   wire                                      slv_read_ack;
115   wire                                      slv_write_ack;
116   integer                                   byte_index, bit_index;
117
118   // USER logic implementation added here
119     assign LED    = slv_reg0[7:0];
120   // ------------------------------------------------------
121   // Example code to read/write user logic slave model s/w accessible registers
122   //
123   // Note:
124   // The example code presented here is to show you one way of reading/writing
125   // software accessible registers implemented in the user logic slave model.
126   // Each bit of the Bus2IP_WrCE/Bus2IP_RdCE signals is configured to correspond
127   // to one software accessible register by the top level template. For example,
128   // if you have four 32 bit software accessible registers in the user logic,
129   // you are basically operating on the following memory mapped registers:
130   //
131   //    Bus2IP_WrCE/Bus2IP_RdCE   Memory Mapped Register
132   //                     "1000"   C_BASEADDR + 0x0
133   //                     "0100"   C_BASEADDR + 0x4
134   //                     "0010"   C_BASEADDR + 0x8
135   //                     "0001"   C_BASEADDR + 0xC
136   //
137   // ------------------------------------------------------
138
139   assign
140     slv_reg_write_sel = Bus2IP_WrCE[0:0],
141     slv_reg_read_sel  = Bus2IP_RdCE[0:0],
142     slv_write_ack     = Bus2IP_WrCE[0],
143     slv_read_ack      = Bus2IP_RdCE[0];
144
145
146
147   // implement slave model register(s)
148   always @( posedge Bus2IP_Clk )
149     begin
150
151       if ( Bus2IP_Resetn == 1‘b0 )
152         begin
153           slv_reg0 <= 0;
154         end
155       else
156         case ( slv_reg_write_sel )
157           1‘b1 :
158             for ( byte_index = 0; byte_index <= (C_SLV_DWIDTH/8)-1; byte_index = byte_index+1 )
159               if ( Bus2IP_BE[byte_index] == 1 )
160                 slv_reg0[(byte_index*8) +: 8] <= Bus2IP_Data[(byte_index*8) +: 8];
161           default : begin
162             slv_reg0 <= slv_reg0;
163                     end
164         endcase
165
166     end // SLAVE_REG_WRITE_PROC
167
168   // implement slave model register read mux
169   always @( slv_reg_read_sel or slv_reg0 )
170     begin
171
172       case ( slv_reg_read_sel )
173         1‘b1 : slv_ip2bus_data <= slv_reg0;
174         default : slv_ip2bus_data <= 0;
175       endcase
176
177     end // SLAVE_REG_READ_PROC
178
179   // ------------------------------------------------------------
180   // Example code to drive IP to Bus signals
181   // ------------------------------------------------------------
182
183 assign IP2Bus_Data = (slv_read_ack == 1‘b1) ? slv_ip2bus_data :  0 ;
184   assign IP2Bus_WrAck = slv_write_ack;
185   assign IP2Bus_RdAck = slv_read_ack;
186   assign IP2Bus_Error = 0;
187
188 endmodule

代码中57、86行

LED,
output        [7:0]                        LED;

表明在用户逻辑中,定义了名为LED的端口,方向是输出,长度为8。

代码中119行

assign LED    = slv_reg0[7:0];

表明将slv_reg0的低8位传递给输出端口LED。其实就是实现了数据寄存器的值作用到输出端口的功能。

需要将用户逻辑和IPIF连接上,需要完成user_logic的例化

Lab4\pcores\my_axi_ip_v1_00_a\hdl\vhdl\my_axi_ip.vhd

  1 ------------------------------------------------------------------------------
  2 -- my_axi_ip.vhd - entity/architecture pair
  3 ------------------------------------------------------------------------------
  4 -- IMPORTANT:
  5 -- DO NOT MODIFY THIS FILE EXCEPT IN THE DESIGNATED SECTIONS.
  6 --
  7 -- SEARCH FOR --USER TO DETERMINE WHERE CHANGES ARE ALLOWED.
  8 --
  9 -- TYPICALLY, THE ONLY ACCEPTABLE CHANGES INVOLVE ADDING NEW
 10 -- PORTS AND GENERICS THAT GET PASSED THROUGH TO THE INSTANTIATION
 11 -- OF THE USER_LOGIC ENTITY.
 12 ------------------------------------------------------------------------------
 13 --
 14 -- ***************************************************************************
 15 -- ** Copyright (c) 1995-2012 Xilinx, Inc.  All rights reserved.            **
 16 -- **                                                                       **
 17 -- ** Xilinx, Inc.                                                          **
 18 -- ** XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS"         **
 19 -- ** AS A COURTESY TO YOU, SOLELY FOR USE IN DEVELOPING PROGRAMS AND       **
 20 -- ** SOLUTIONS FOR XILINX DEVICES.  BY PROVIDING THIS DESIGN, CODE,        **
 21 -- ** OR INFORMATION AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE,        **
 22 -- ** APPLICATION OR STANDARD, XILINX IS MAKING NO REPRESENTATION           **
 23 -- ** THAT THIS IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT,     **
 24 -- ** AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE      **
 25 -- ** FOR YOUR IMPLEMENTATION.  XILINX EXPRESSLY DISCLAIMS ANY              **
 26 -- ** WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE               **
 27 -- ** IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR        **
 28 -- ** REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF       **
 29 -- ** INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS       **
 30 -- ** FOR A PARTICULAR PURPOSE.                                             **
 31 -- **                                                                       **
 32 -- ***************************************************************************
 33 --
 34 ------------------------------------------------------------------------------
 35 -- Filename:          my_axi_ip.vhd
 36 -- Version:           1.00.a
 37 -- Description:       Top level design, instantiates library components and user logic.
 38 -- Date:              Tue Oct 09 18:28:06 2012 (by Create and Import Peripheral Wizard)
 39 -- VHDL Standard:     VHDL‘93
 40 ------------------------------------------------------------------------------
 41 -- Naming Conventions:
 42 --   active low signals:                    "*_n"
 43 --   clock signals:                         "clk", "clk_div#", "clk_#x"
 44 --   reset signals:                         "rst", "rst_n"
 45 --   generics:                              "C_*"
 46 --   user defined types:                    "*_TYPE"
 47 --   state machine next state:              "*_ns"
 48 --   state machine current state:           "*_cs"
 49 --   combinatorial signals:                 "*_com"
 50 --   pipelined or register delay signals:   "*_d#"
 51 --   counter signals:                       "*cnt*"
 52 --   clock enable signals:                  "*_ce"
 53 --   internal version of output port:       "*_i"
 54 --   device pins:                           "*_pin"
 55 --   ports:                                 "- Names begin with Uppercase"
 56 --   processes:                             "*_PROCESS"
 57 --   component instantiations:              "<ENTITY_>I_<#|FUNC>"
 58 ------------------------------------------------------------------------------
 59
 60 library ieee;
 61 use ieee.std_logic_1164.all;
 62 use ieee.std_logic_arith.all;
 63 use ieee.std_logic_unsigned.all;
 64
 65 library proc_common_v3_00_a;
 66 use proc_common_v3_00_a.proc_common_pkg.all;
 67 use proc_common_v3_00_a.ipif_pkg.all;
 68
 69 library axi_lite_ipif_v1_01_a;
 70 use axi_lite_ipif_v1_01_a.axi_lite_ipif;
 71
 72 ------------------------------------------------------------------------------
 73 -- Entity section
 74 ------------------------------------------------------------------------------
 75 -- Definition of Generics:
 76 --   C_S_AXI_DATA_WIDTH           -- AXI4LITE slave: Data width
 77 --   C_S_AXI_ADDR_WIDTH           -- AXI4LITE slave: Address Width
 78 --   C_S_AXI_MIN_SIZE             -- AXI4LITE slave: Min Size
 79 --   C_USE_WSTRB                  -- AXI4LITE slave: Write Strobe
 80 --   C_DPHASE_TIMEOUT             -- AXI4LITE slave: Data Phase Timeout
 81 --   C_BASEADDR                   -- AXI4LITE slave: base address
 82 --   C_HIGHADDR                   -- AXI4LITE slave: high address
 83 --   C_FAMILY                     -- FPGA Family
 84 --   C_NUM_REG                    -- Number of software accessible registers
 85 --   C_NUM_MEM                    -- Number of address-ranges
 86 --   C_SLV_AWIDTH                 -- Slave interface address bus width
 87 --   C_SLV_DWIDTH                 -- Slave interface data bus width
 88 --
 89 -- Definition of Ports:
 90 --   S_AXI_ACLK                   -- AXI4LITE slave: Clock
 91 --   S_AXI_ARESETN                -- AXI4LITE slave: Reset
 92 --   S_AXI_AWADDR                 -- AXI4LITE slave: Write address
 93 --   S_AXI_AWVALID                -- AXI4LITE slave: Write address valid
 94 --   S_AXI_WDATA                  -- AXI4LITE slave: Write data
 95 --   S_AXI_WSTRB                  -- AXI4LITE slave: Write strobe
 96 --   S_AXI_WVALID                 -- AXI4LITE slave: Write data valid
 97 --   S_AXI_BREADY                 -- AXI4LITE slave: Response ready
 98 --   S_AXI_ARADDR                 -- AXI4LITE slave: Read address
 99 --   S_AXI_ARVALID                -- AXI4LITE slave: Read address valid
100 --   S_AXI_RREADY                 -- AXI4LITE slave: Read data ready
101 --   S_AXI_ARREADY                -- AXI4LITE slave: read addres ready
102 --   S_AXI_RDATA                  -- AXI4LITE slave: Read data
103 --   S_AXI_RRESP                  -- AXI4LITE slave: Read data response
104 --   S_AXI_RVALID                 -- AXI4LITE slave: Read data valid
105 --   S_AXI_WREADY                 -- AXI4LITE slave: Write data ready
106 --   S_AXI_BRESP                  -- AXI4LITE slave: Response
107 --   S_AXI_BVALID                 -- AXI4LITE slave: Resonse valid
108 --   S_AXI_AWREADY                -- AXI4LITE slave: Wrte address ready
109 ------------------------------------------------------------------------------
110
111 entity my_axi_ip is
112   generic
113   (
114     -- ADD USER GENERICS BELOW THIS LINE ---------------
115     --USER generics added here
116     -- ADD USER GENERICS ABOVE THIS LINE ---------------
117
118     -- DO NOT EDIT BELOW THIS LINE ---------------------
119     -- Bus protocol parameters, do not add to or delete
120     C_S_AXI_DATA_WIDTH             : integer              := 32;
121     C_S_AXI_ADDR_WIDTH             : integer              := 32;
122     C_S_AXI_MIN_SIZE               : std_logic_vector     := X"000001FF";
123     C_USE_WSTRB                    : integer              := 0;
124     C_DPHASE_TIMEOUT               : integer              := 8;
125     C_BASEADDR                     : std_logic_vector     := X"FFFFFFFF";
126     C_HIGHADDR                     : std_logic_vector     := X"00000000";
127     C_FAMILY                       : string               := "virtex6";
128     C_NUM_REG                      : integer              := 1;
129     C_NUM_MEM                      : integer              := 1;
130     C_SLV_AWIDTH                   : integer              := 32;
131     C_SLV_DWIDTH                   : integer              := 32
132     -- DO NOT EDIT ABOVE THIS LINE ---------------------
133   );
134   port
135   (
136     -- ADD USER PORTS BELOW THIS LINE ------------------
137     LED                                : out std_logic_vector(7 downto 0);
138     -- ADD USER PORTS ABOVE THIS LINE ------------------
139
140     -- DO NOT EDIT BELOW THIS LINE ---------------------
141     -- Bus protocol ports, do not add to or delete
142     S_AXI_ACLK                     : in  std_logic;
143     S_AXI_ARESETN                  : in  std_logic;
144     S_AXI_AWADDR                   : in  std_logic_vector(C_S_AXI_ADDR_WIDTH-1 downto 0);
145     S_AXI_AWVALID                  : in  std_logic;
146     S_AXI_WDATA                    : in  std_logic_vector(C_S_AXI_DATA_WIDTH-1 downto 0);
147     S_AXI_WSTRB                    : in  std_logic_vector((C_S_AXI_DATA_WIDTH/8)-1 downto 0);
148     S_AXI_WVALID                   : in  std_logic;
149     S_AXI_BREADY                   : in  std_logic;
150     S_AXI_ARADDR                   : in  std_logic_vector(C_S_AXI_ADDR_WIDTH-1 downto 0);
151     S_AXI_ARVALID                  : in  std_logic;
152     S_AXI_RREADY                   : in  std_logic;
153     S_AXI_ARREADY                  : out std_logic;
154     S_AXI_RDATA                    : out std_logic_vector(C_S_AXI_DATA_WIDTH-1 downto 0);
155     S_AXI_RRESP                    : out std_logic_vector(1 downto 0);
156     S_AXI_RVALID                   : out std_logic;
157     S_AXI_WREADY                   : out std_logic;
158     S_AXI_BRESP                    : out std_logic_vector(1 downto 0);
159     S_AXI_BVALID                   : out std_logic;
160     S_AXI_AWREADY                  : out std_logic
161     -- DO NOT EDIT ABOVE THIS LINE ---------------------
162   );
163
164   attribute MAX_FANOUT : string;
165   attribute SIGIS : string;
166   attribute MAX_FANOUT of S_AXI_ACLK       : signal is "10000";
167   attribute MAX_FANOUT of S_AXI_ARESETN       : signal is "10000";
168   attribute SIGIS of S_AXI_ACLK       : signal is "Clk";
169   attribute SIGIS of S_AXI_ARESETN       : signal is "Rst";
170 end entity my_axi_ip;
171
172 ------------------------------------------------------------------------------
173 -- Architecture section
174 ------------------------------------------------------------------------------
175
176 architecture IMP of my_axi_ip is
177
178   constant USER_SLV_DWIDTH                : integer              := C_S_AXI_DATA_WIDTH;
179
180   constant IPIF_SLV_DWIDTH                : integer              := C_S_AXI_DATA_WIDTH;
181
182   constant ZERO_ADDR_PAD                  : std_logic_vector(0 to 31) := (others => ‘0‘);
183   constant USER_SLV_BASEADDR              : std_logic_vector     := C_BASEADDR;
184   constant USER_SLV_HIGHADDR              : std_logic_vector     := C_HIGHADDR;
185
186   constant IPIF_ARD_ADDR_RANGE_ARRAY      : SLV64_ARRAY_TYPE     :=
187     (
188       ZERO_ADDR_PAD & USER_SLV_BASEADDR,  -- user logic slave space base address
189       ZERO_ADDR_PAD & USER_SLV_HIGHADDR   -- user logic slave space high address
190     );
191
192   constant USER_SLV_NUM_REG               : integer              := 1;
193   constant USER_NUM_REG                   : integer              := USER_SLV_NUM_REG;
194   constant TOTAL_IPIF_CE                  : integer              := USER_NUM_REG;
195
196   constant IPIF_ARD_NUM_CE_ARRAY          : INTEGER_ARRAY_TYPE   :=
197     (
198       0  => (USER_SLV_NUM_REG)            -- number of ce for user logic slave space
199     );
200
201   ------------------------------------------
202   -- Index for CS/CE
203   ------------------------------------------
204   constant USER_SLV_CS_INDEX              : integer              := 0;
205   constant USER_SLV_CE_INDEX              : integer              := calc_start_ce_index(IPIF_ARD_NUM_CE_ARRAY, USER_SLV_CS_INDEX);
206
207   constant USER_CE_INDEX                  : integer              := USER_SLV_CE_INDEX;
208
209   ------------------------------------------
210   -- IP Interconnect (IPIC) signal declarations
211   ------------------------------------------
212   signal ipif_Bus2IP_Clk                : std_logic;
213   signal ipif_Bus2IP_Resetn             : std_logic;
214   signal ipif_Bus2IP_Addr               : std_logic_vector(C_S_AXI_ADDR_WIDTH-1 downto 0);
215   signal ipif_Bus2IP_RNW                : std_logic;
216   signal ipif_Bus2IP_BE                 : std_logic_vector(IPIF_SLV_DWIDTH/8-1 downto 0);
217   signal ipif_Bus2IP_CS                 : std_logic_vector((IPIF_ARD_ADDR_RANGE_ARRAY‘LENGTH)/2-1 downto 0);
218   signal ipif_Bus2IP_RdCE               : std_logic_vector(calc_num_ce(IPIF_ARD_NUM_CE_ARRAY)-1 downto 0);
219   signal ipif_Bus2IP_WrCE               : std_logic_vector(calc_num_ce(IPIF_ARD_NUM_CE_ARRAY)-1 downto 0);
220   signal ipif_Bus2IP_Data               : std_logic_vector(IPIF_SLV_DWIDTH-1 downto 0);
221   signal ipif_IP2Bus_WrAck              : std_logic;
222   signal ipif_IP2Bus_RdAck              : std_logic;
223   signal ipif_IP2Bus_Error              : std_logic;
224   signal ipif_IP2Bus_Data               : std_logic_vector(IPIF_SLV_DWIDTH-1 downto 0);
225   signal user_Bus2IP_RdCE               : std_logic_vector(USER_NUM_REG-1 downto 0);
226   signal user_Bus2IP_WrCE               : std_logic_vector(USER_NUM_REG-1 downto 0);
227   signal user_IP2Bus_Data               : std_logic_vector(USER_SLV_DWIDTH-1 downto 0);
228   signal user_IP2Bus_RdAck              : std_logic;
229   signal user_IP2Bus_WrAck              : std_logic;
230   signal user_IP2Bus_Error              : std_logic;
231
232   ------------------------------------------
233   -- Component declaration for verilog user logic
234   ------------------------------------------
235   component user_logic is
236     generic
237     (
238       -- ADD USER GENERICS BELOW THIS LINE ---------------
239       --USER generics added here
240       -- ADD USER GENERICS ABOVE THIS LINE ---------------
241
242       -- DO NOT EDIT BELOW THIS LINE ---------------------
243       -- Bus protocol parameters, do not add to or delete
244       C_NUM_REG                      : integer              := 1;
245       C_SLV_DWIDTH                   : integer              := 32
246       -- DO NOT EDIT ABOVE THIS LINE ---------------------
247     );
248     port
249     (
250       -- ADD USER PORTS BELOW THIS LINE ------------------
251       LED                                : out std_logic_vector(7 downto 0);
252       -- ADD USER PORTS ABOVE THIS LINE ------------------
253
254       -- DO NOT EDIT BELOW THIS LINE ---------------------
255       -- Bus protocol ports, do not add to or delete
256       Bus2IP_Clk                     : in  std_logic;
257       Bus2IP_Resetn                  : in  std_logic;
258       Bus2IP_Data                    : in  std_logic_vector(C_SLV_DWIDTH-1 downto 0);
259       Bus2IP_BE                      : in  std_logic_vector(C_SLV_DWIDTH/8-1 downto 0);
260       Bus2IP_RdCE                    : in  std_logic_vector(C_NUM_REG-1 downto 0);
261       Bus2IP_WrCE                    : in  std_logic_vector(C_NUM_REG-1 downto 0);
262       IP2Bus_Data                    : out std_logic_vector(C_SLV_DWIDTH-1 downto 0);
263       IP2Bus_RdAck                   : out std_logic;
264       IP2Bus_WrAck                   : out std_logic;
265       IP2Bus_Error                   : out std_logic
266       -- DO NOT EDIT ABOVE THIS LINE ---------------------
267     );
268   end component user_logic;
269
270 begin
271
272   ------------------------------------------
273   -- instantiate axi_lite_ipif
274   ------------------------------------------
275   AXI_LITE_IPIF_I : entity axi_lite_ipif_v1_01_a.axi_lite_ipif
276     generic map
277     (
278       C_S_AXI_DATA_WIDTH             => IPIF_SLV_DWIDTH,
279       C_S_AXI_ADDR_WIDTH             => C_S_AXI_ADDR_WIDTH,
280       C_S_AXI_MIN_SIZE               => C_S_AXI_MIN_SIZE,
281       C_USE_WSTRB                    => C_USE_WSTRB,
282       C_DPHASE_TIMEOUT               => C_DPHASE_TIMEOUT,
283       C_ARD_ADDR_RANGE_ARRAY         => IPIF_ARD_ADDR_RANGE_ARRAY,
284       C_ARD_NUM_CE_ARRAY             => IPIF_ARD_NUM_CE_ARRAY,
285       C_FAMILY                       => C_FAMILY
286     )
287     port map
288     (
289       S_AXI_ACLK                     => S_AXI_ACLK,
290       S_AXI_ARESETN                  => S_AXI_ARESETN,
291       S_AXI_AWADDR                   => S_AXI_AWADDR,
292       S_AXI_AWVALID                  => S_AXI_AWVALID,
293       S_AXI_WDATA                    => S_AXI_WDATA,
294       S_AXI_WSTRB                    => S_AXI_WSTRB,
295       S_AXI_WVALID                   => S_AXI_WVALID,
296       S_AXI_BREADY                   => S_AXI_BREADY,
297       S_AXI_ARADDR                   => S_AXI_ARADDR,
298       S_AXI_ARVALID                  => S_AXI_ARVALID,
299       S_AXI_RREADY                   => S_AXI_RREADY,
300       S_AXI_ARREADY                  => S_AXI_ARREADY,
301       S_AXI_RDATA                    => S_AXI_RDATA,
302       S_AXI_RRESP                    => S_AXI_RRESP,
303       S_AXI_RVALID                   => S_AXI_RVALID,
304       S_AXI_WREADY                   => S_AXI_WREADY,
305       S_AXI_BRESP                    => S_AXI_BRESP,
306       S_AXI_BVALID                   => S_AXI_BVALID,
307       S_AXI_AWREADY                  => S_AXI_AWREADY,
308       Bus2IP_Clk                     => ipif_Bus2IP_Clk,
309       Bus2IP_Resetn                  => ipif_Bus2IP_Resetn,
310       Bus2IP_Addr                    => ipif_Bus2IP_Addr,
311       Bus2IP_RNW                     => ipif_Bus2IP_RNW,
312       Bus2IP_BE                      => ipif_Bus2IP_BE,
313       Bus2IP_CS                      => ipif_Bus2IP_CS,
314       Bus2IP_RdCE                    => ipif_Bus2IP_RdCE,
315       Bus2IP_WrCE                    => ipif_Bus2IP_WrCE,
316       Bus2IP_Data                    => ipif_Bus2IP_Data,
317       IP2Bus_WrAck                   => ipif_IP2Bus_WrAck,
318       IP2Bus_RdAck                   => ipif_IP2Bus_RdAck,
319       IP2Bus_Error                   => ipif_IP2Bus_Error,
320       IP2Bus_Data                    => ipif_IP2Bus_Data
321     );
322
323   ------------------------------------------
324   -- instantiate User Logic
325   ------------------------------------------
326   USER_LOGIC_I : component user_logic
327     generic map
328     (
329       -- MAP USER GENERICS BELOW THIS LINE ---------------
330       --USER generics mapped here
331       -- MAP USER GENERICS ABOVE THIS LINE ---------------
332
333       C_NUM_REG                      => USER_NUM_REG,
334       C_SLV_DWIDTH                   => USER_SLV_DWIDTH
335     )
336     port map
337     (
338       -- MAP USER PORTS BELOW THIS LINE ------------------
339       LED                            => LED,
340       -- MAP USER PORTS ABOVE THIS LINE ------------------
341
342       Bus2IP_Clk                     => ipif_Bus2IP_Clk,
343       Bus2IP_Resetn                  => ipif_Bus2IP_Resetn,
344       Bus2IP_Data                    => ipif_Bus2IP_Data,
345       Bus2IP_BE                      => ipif_Bus2IP_BE,
346       Bus2IP_RdCE                    => user_Bus2IP_RdCE,
347       Bus2IP_WrCE                    => user_Bus2IP_WrCE,
348       IP2Bus_Data                    => user_IP2Bus_Data,
349       IP2Bus_RdAck                   => user_IP2Bus_RdAck,
350       IP2Bus_WrAck                   => user_IP2Bus_WrAck,
351       IP2Bus_Error                   => user_IP2Bus_Error
352     );
353
354   ------------------------------------------
355   -- connect internal signals
356   ------------------------------------------
357   ipif_IP2Bus_Data <= user_IP2Bus_Data;
358   ipif_IP2Bus_WrAck <= user_IP2Bus_WrAck;
359   ipif_IP2Bus_RdAck <= user_IP2Bus_RdAck;
360   ipif_IP2Bus_Error <= user_IP2Bus_Error;
361
362   user_Bus2IP_RdCE <= ipif_Bus2IP_RdCE(USER_NUM_REG-1 downto 0);
363   user_Bus2IP_WrCE <= ipif_Bus2IP_WrCE(USER_NUM_REG-1 downto 0);
364
365 end IMP;

137行

LED                                : out std_logic_vector(7 downto 0);

定义IP的端口为LED,这里需要和之前修改MPD文件一致。

232-268行为元件声明

 1 ------------------------------------------
 2 -- Component declaration for verilog user logic
 3 ------------------------------------------
 4 component user_logic is
 5   generic
 6   (
 7     -- ADD USER GENERICS BELOW THIS LINE ---------------
 8     --USER generics added here
 9     -- ADD USER GENERICS ABOVE THIS LINE ---------------
10
11     -- DO NOT EDIT BELOW THIS LINE ---------------------
12     -- Bus protocol parameters, do not add to or delete
13     C_NUM_REG                      : integer              := 1;
14     C_SLV_DWIDTH                   : integer              := 32
15     -- DO NOT EDIT ABOVE THIS LINE ---------------------
16   );
17   port
18   (
19     -- ADD USER PORTS BELOW THIS LINE ------------------
20     LED                                : out std_logic_vector(7 downto 0);
21     -- ADD USER PORTS ABOVE THIS LINE ------------------
22
23     -- DO NOT EDIT BELOW THIS LINE ---------------------
24     -- Bus protocol ports, do not add to or delete
25     Bus2IP_Clk                     : in  std_logic;
26     Bus2IP_Resetn                  : in  std_logic;
27     Bus2IP_Data                    : in  std_logic_vector(C_SLV_DWIDTH-1 downto 0);
28     Bus2IP_BE                      : in  std_logic_vector(C_SLV_DWIDTH/8-1 downto 0);
29     Bus2IP_RdCE                    : in  std_logic_vector(C_NUM_REG-1 downto 0);
30     Bus2IP_WrCE                    : in  std_logic_vector(C_NUM_REG-1 downto 0);
31     IP2Bus_Data                    : out std_logic_vector(C_SLV_DWIDTH-1 downto 0);
32     IP2Bus_RdAck                   : out std_logic;
33     IP2Bus_WrAck                   : out std_logic;
34     IP2Bus_Error                   : out std_logic
35     -- DO NOT EDIT ABOVE THIS LINE ---------------------
36   );
37 end component user_logic;

323-352行为user_logic元件例化。VHDL是不区分大小写的。

 1 ------------------------------------------
 2 -- instantiate User Logic
 3 ------------------------------------------
 4 USER_LOGIC_I : component user_logic
 5   generic map
 6   (
 7     -- MAP USER GENERICS BELOW THIS LINE ---------------
 8     --USER generics mapped here
 9     -- MAP USER GENERICS ABOVE THIS LINE ---------------
10
11     C_NUM_REG                      => USER_NUM_REG,
12     C_SLV_DWIDTH                   => USER_SLV_DWIDTH
13   )
14   port map
15   (
16     -- MAP USER PORTS BELOW THIS LINE ------------------
17     LED                            => LED,
18     -- MAP USER PORTS ABOVE THIS LINE ------------------
19
20     Bus2IP_Clk                     => ipif_Bus2IP_Clk,
21     Bus2IP_Resetn                  => ipif_Bus2IP_Resetn,
22     Bus2IP_Data                    => ipif_Bus2IP_Data,
23     Bus2IP_BE                      => ipif_Bus2IP_BE,
24     Bus2IP_RdCE                    => user_Bus2IP_RdCE,
25     Bus2IP_WrCE                    => user_Bus2IP_WrCE,
26     IP2Bus_Data                    => user_IP2Bus_Data,
27     IP2Bus_RdAck                   => user_IP2Bus_RdAck,
28     IP2Bus_WrAck                   => user_IP2Bus_WrAck,
29     IP2Bus_Error                   => user_IP2Bus_Error
30   );

这几个文件修改后保存。

Project->Rescan User Repositories(更新用户仓库?),让XPS识别到对IP所做的修改

三、将自定义IP核添加到PS系统

同第三篇一样,需要将IP添加到PS系统中。

在Ports标签中,需要将我们定义的LED端口设置为外部端口,外部引脚名按照Zedboard的习惯,定义为LD

在Address标签中,设定IP的地址。XPS支持自定义定制范围、空间大小等。可以使用默认设置,也可以手动设置。这里我设置基地址为0x40000000,其实也就是我们设定的数据寄存器的地址为0x40000000。如果有更多的寄存器,会以4字节offset 地址的方式访问即可。

最后一样修改ucf文件,完成约束。

1 NET LD[0] LOC = T22  | IOSTANDARD=LVCMOS33;  # "LD0"
2 NET LD[1] LOC = T21  | IOSTANDARD=LVCMOS33;  # "LD1"
3 NET LD[2] LOC = U22  | IOSTANDARD=LVCMOS33;  # "LD2"
4 NET LD[3] LOC = U21  | IOSTANDARD=LVCMOS33;  # "LD3"
5 NET LD[4] LOC = V22  | IOSTANDARD=LVCMOS33;  # "LD4"
6 NET LD[5] LOC = W22  | IOSTANDARD=LVCMOS33;  # "LD5"
7 NET LD[6] LOC = U19  | IOSTANDARD=LVCMOS33;  # "LD6"
8 NET LD[7] LOC = U14  | IOSTANDARD=LVCMOS33;  # "LD7"

最后对这个系统编译,生成bitstream文件,并将硬件配置导入到SDK,并启动SDK。

四、使用SDK编写IP核驱动程序和应用程序

打开SDK,可以从系统信息system.xml中看到我们的系统信息。可以看到我们实例化连接到系统的ip是my_axi_ip_0,基地址是0x4000000。

建立软件工程后,修改main代码,如下

//@超群天晴 http://www.cnblogs.com/surpassal/ 1 #include <stdio.h>
 2 #include "xparameters.h"
 3 #include "xil_types.h"
 4 #include "xstatus.h"
 5 #include "xil_io.h"//包含xil_io头文件,完成对绝对地址的访问
 6 #include "platform.h"
 7
 8 #define LED_DATA_REG 0x40000000
 9
10 void print(char *ptr);
11 void delay(unsigned int delaytime);
12 void LED_Play(unsigned char led);
13
14
15 int main(void)
16 {
17
18     init_platform();
19
20     print("ZedBoard LAB4: MY_AXI_LEDs\n\r");
21     print("超群天晴 2012年10月8日22:12:31\n\r");
22
23     LED_Play(0x03);
24     while(1);
25
26     cleanup_platform();
27
28     return 0;
29 }
30
31
32 void delay(unsigned int delaytime)
33 {
34     int i;
35     for(i=0;i<delaytime;i++)
36         ;
37 }
38
39 void LED_Play(unsigned char led)
40 {
41     for(;;)
42     {
43         led=(led<<1)|(led>>7);
44         Xil_Out32(LED_DATA_REG,led);
45         delay(50000000);
46     }
47 }

定义了两个函数

void delay(unsigned int delaytime);
void LED_Play(unsigned char led);

其中delay()为延时函数,参数为延时时间,100000000大约延时1s;

LED_Play()为LED流水灯函数,参数是流水初始值。在程序里面设定的是0x2,也就LD0、LD1最开始亮,然后流水。

其中第8行

#define LED_DATA_REG 0x40000000

使用宏定义,定义LED_DATA_REG,实际上就是自定义IP的基地址。

第44行

Xil_Out32(LED_DATA_REG,led);

使用了xil_io.h提供的绝对地址访问函数Xil_Out32(u32 OutAddress, u32 Value),定义如下

 1 /*****************************************************************************/
 2 /**
 3 *
 4 * Performs an output operation for a 32-bit memory location by writing the
 5 * specified Value to the the specified address.
 6 *
 7 * @param    OutAddress contains the address to perform the output operation
 8 *        at.
 9 * @param    Value contains the Value to be output at the specified address.
10 *
11 * @return    None.
12 *
13 * @note        None.
14 *
15 ******************************************************************************/
16 void Xil_Out32(u32 OutAddress, u32 Value)
17 {
18     /* write the contents of the I/O location and then synchronize the I/O
19      * such that the I/O operation completes before proceeding on
20      */
21     *(volatile u32 *) OutAddress = Value;
22     SYNCHRONIZE_IO;
23 }

可以看出,其实现的功能就是向32位绝对地址OutAddress中写入32位无符号值Value。参考这样的写法,可以将地址访问修改

1 #define LED_DATA_ADDR 0x40000000
2 #define LED_DATA_REG(x) *(volatile unsigned int *) LED_DATA_ADDR = x

然后修改寄存器的值,只需要修改LED_DATA_REG(x)参数x的值即可。

四、运行结果

编译下载之后,可以从超级终端看到调试信息

同时Zedboard上的 LD 流水

================================

备注:

有关AXI协议,请参考

AXI Bus Functional Model v1.1 Product Brief

AXI Reference Guide (AXI)

更多资料,请参考

AXI IP Documentation

================================

完整工程代码:Lab4.rar

时间: 05-15

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