深入浅出FPGA-15-xilinx_zynq7000_EPP上一个简单实验(PL)
引言
之前用的都是alter的东西，xilinx的没实际做过，但大同小异，下面就以一个简单的例子来熟悉一下这个板子吧。
15.1 实验目的
1》 熟悉zynq7000 EPP资源和design suite。
15.2 实验环境
Board ：ZYNQ7000 EPP
Device：XC7Z020CLG484ACX1221
Design suite：14.1 （ISE design tools）
15.3 xilinx 开发套件结构
15.4 实验准备
1》 安装Xilinx Design Tools
2》 ZYNQ7000 EPP Setup
15.5 实验内容
1》 根据按键，来控制LED的on/off
2》 采用外部diff_clk（156.25MHz），并将其分频成两路不同频率后输出。
15.6 实验步骤
1》 编码rill_led.v和rill_led_tb.v,详见附录文件。
2》 创建ISE工程，modelsim工程。
3》 用modelsim，进行function仿真。
4》 用chipscope，进行FPGA验证。
15.7 实验结果
1》 modelsim仿真波形：
2》 chipscope 仿真波形
附：
1》ISE工程模块代码，UCF文件根据文档找到pin的定义就可以了。
/*
*file name: rill_led.v
*func : simple test
*date : 121030
*/
//===============top level module=============
module rill_led
(
input wire USRCLK_P,//diff_clk_156.25MHz
input wire USRCLK_N,
input wire GPIO_SW_N,
output wire PMOD2_2_LS,
output wire PMOD2_1_LS,
output wire PMOD2_0_LS
);
wire clk;
wire key;
wire led2;
wire led1;
wire led0;
IBUFDS #(.DIFF_TERM ("FALSE"),.IOSTANDARD("DEFAULT"))
my_ibufds
(
.O (clk),//buf output
.I(USRCLK_P),//diff_p buf input(connect directly to top-level port)
.IB (USRCLK_N)//diff_n buf input(connect directly to top-level port)
);
IBUF my_ibuf
(
.O (key),
.I (GPIO_SW_N)//Buffer input (connect directly to top-level port)
);
OBUF my_obuf2
(
.O (PMOD2_2_LS),//Buffer output (connect directly to top-level port)
.I (led2)
);
OBUF my_obuf1
(
.O (PMOD2_1_LS),//Buffer output (connect directly to top-level port)
.I (led1)
);
OBUF my_obuf0
(
.O (PMOD2_0_LS),//Buffer output (connect directly to top-level port)
.I (led0)
);
led MY_LED
(
.clk (clk),
.key (key),
.led0 (led0),
.counter_clk1 (led1),
.counter_clk2 (led2)
);
endmodule //end rill_led
//============================led================
module led
(
input wire clk,
input wire key,
output reg led0,
output reg counter_clk1,
output reg counter_clk2
);
parameter counter_max1 = 156;
parameter counter_max2 = 156;
reg [31:0] counter1 = 0;
reg [31:0] counter2 = 0;
always @(posedge clk)
begin
if(counter1 >= counter_max1)
begin
counter1 <= 0;
counter_clk1 <= 0;
end
else
begin
counter1 <= counter1 + 1;
counter_clk1 <= 1;
end
end
always @(posedge clk)
begin
if(counter2 >= counter_max2)
begin
counter2 <= 0;
counter_clk2 <= 0;
end
else
begin
counter2 <= counter2 + 1;
counter_clk2 <= 1;
end
end
always @(posedge clk)
begin
if(key)
begin
led0 <= 1;
end
else
begin
led0 <= 0;
end
end
endmodule //end led
/************* EOF *****************/2，为了modelsim仿真方便，将上面代码进行简化，即只仿真实际模块。
/*
*file name: rill_led.v
*func : modelsim simple test
*date : 121030
*/
//============================led================
module led
(
input wire clk,
input wire key,
output reg led0,
output reg counter_clk1,
output reg counter_clk2
);
parameter counter_max1 = 3;
parameter counter_max2 = 5;
reg [31:0] counter1 = 0;
reg [31:0] counter2 = 0;
always @(posedge clk)
begin
if(counter1 >= counter_max1)
begin
counter1 <= 0;
counter_clk1 <= 0;
end
else
begin
counter1 <= counter1 + 1;
counter_clk1 <= 1;
end
end
always @(posedge clk)
begin
if(counter2 >= counter_max2)
begin
counter2 <= 0;
counter_clk2 <= 0;
end
else
begin
counter2 <= counter2 + 1;
counter_clk2 <= 1;
end
end
always @(posedge clk)
begin
if(key)
begin
led0 <= 1;
end
else
begin
led0 <= 0;
end
end
endmodule //end led
/************* EOF *****************/3，modelsim仿真testbench文件
`timescale 1ns/1ns
module rill_led_tb;
reg clk;
reg key;
wire led0;
wire counter1;
wire counter2;
led MY_LED
(
.clk (clk),
.key (key),
.led0(led0),
.counter_clk1 (counter1),
.counter_clk2 (counter2)
);
initial
begin
clk = 0;
#1000 key = 0;
#1000 key = 1;
#1000 key = 0;
#1000 key = 1;
#1000 $stop;
end
always #20 clk = ~clk;
endmodule
/*************** EOF ******************/