CrazyBingo

（1）verilog代码

/********************************************************************
* Module Name : Crazy_LED
* Author : Crazy Bingo
* Device : EP2C8Q208C8
* Version : Quartus II 10.1
* Date : 2011-3-2
* Description :
*********************************************************************/
module Crazy_LED
(
//Avalon Clock
input csi_clk,
input csi_rst_n,
//Avalon-MM
input avs_chipselect,
input [1:0] avs_address, //multiple of 4
// input [1:0] avs_byteenable_n, //1,2,4,8,16,54,128
input avs_write,
input [31:0] avs_writedata, //32bit cpu
input avs_read,
output [31:0] avs_readdata, //32bit cpu
//Avalon Conduit
output [1:0] coe_data // 2 bis led
);

//write
reg [1:0] coe_data_r;
always @(posedge csi_clk or negedge csi_rst_n)
begin
if (!csi_rst_n)
coe_data_r <= 0;
else if (avs_chipselect && avs_write && (avs_address == 0))
coe_data_r <= avs_writedata[1:0];
end
assign coe_data = coe_data_r;

//read
reg [1:0] avs_readdata_r;
always @(posedge csi_clk or negedge csi_rst_n)
begin
if (!csi_rst_n)
avs_readdata_r <= 0;
else if (avs_chipselect && avs_read && (avs_address == 0)) //for steady state
avs_readdata_r <= coe_data;
end
assign avs_readdata = avs_readdata_r;

endmodule

（2）SOPC导入ip

（3）建立Quartus 工程

module sram_test
(
//global clk
input clk,
input rst_n,
//sram interface
inout [15:0] sram_data,
output [18:0] sram_addr,
output sram_ce_n,
output sram_we_n,
output sram_oe_n,
output sram_ub_n,
output sram_lb_n,
//user interface
output [1:0] led_data
);

sram_test_core sram_test_core_inst
(
.clk (clk),
.reset_n (rst_n),
.coe_SRAM_ADDR_from_the_sram (sram_addr),
.coe_SRAM_CE_N_from_the_sram (sram_ce_n),
.coe_SRAM_DQ_to_and_from_the_sram (sram_data),
.coe_SRAM_LB_N_from_the_sram (sram_lb_n),
.coe_SRAM_OE_N_from_the_sram (sram_oe_n),
.coe_SRAM_UB_N_from_the_sram (sram_ub_n),
.coe_SRAM_WE_N_from_the_sram (sram_we_n),
.coe_data_from_the_led_data (led_data)
);

（4）建立nios2 工程

#include
#include "system.h"
#include "unistd.h"
#include "io.h"

#define LED_DATA_ADDR (LED_DATA_BASE | (1<<31))
#define LED_DATA (*(volatile unsigned int*)LED_DATA_ADDR)

int main()
{
printf("Hello from Nios II!\n");
while(1)
{
LED_DATA = LED_DATA + 1;

}
return 0;
}

run handware OK