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| module memorio(caddress,address,memread,memwrite,ioread,iowrite,mread_data,ioread_data,wdata,rdata,write_data,LEDCtrl,SwitchCtrl);
input[31:0] caddress; // from alu_result in executs32
input memread; // read memory, from control32
input memwrite; // write memory, from control32
input ioread; // read IO, from control32
input iowrite; // write IO, from control32
input[31:0] mread_data; // data from memory
input[15:0] ioread_data; // data from io,16 bits
input[31:0] wdata; // the data from idecode32,that want to write memory or io
output[31:0] rdata; // data from memory or IO that want to read into register
output[31:0] write_data; // data to memory or I/O
output[31:0] address; // address to mAddress and I/O
output LEDCtrl; // LED CS
output SwitchCtrl; // Switch CS
reg[31:0] write_data;
wire iorw;
assign address = caddress;
assign rdata = (iowrite == 1'b1) ? {16'b0, ioread_data} : memread; // 可能是从memory读出，也可能自io读出，自io读取的数据是rdata的低16bit
assign iorw = (iowrite||ioread);
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
assign LEDCtrl = ioread; // led 模块的片选信号，高电平有效;
assign SwitchCtrl = memread; //switch 模块的片选信号，高电平有效
always @* begin
if((memwrite==1)||(iowrite==1)) begin
write_data = wdata;
end else begin
write_data = 32'hZZZZZZZZ;
end
end
endmodule
`timescale 1ns / 1ps
module dmemory32(read_data,address,write_data,Memwrite,clock);
output[31:0] read_data; // 从存储器中获得的数据
input[31:0] address; //来自memorio模块，源头是来自执行单元算出的alu_result
input[31:0] write_data; //来自译码单元的read_data2
input Memwrite; //来自控制单元
input clock;
wire clk;
assign clk = !clock; // 因为使用Block ram的固有延迟，RAM的地址线来不及在时钟上升沿准备好,
// 使得时钟上升沿数据读出有误，所以采用反相时钟，使得读出数据比地址准
// 备好要晚大约半个时钟，从而得到正确地址。
//分配64KB RAM，编译器实际只用 64KB RAM
RAM ram (
.clka(clk), // input wire clka
.wea(Memwrite), // input wire [0 : 0] wea
.addra(address[15:2]), // input wire [13 : 0] addra
.dina(write_data), // input wire [31 : 0] dina
.douta(read_data) // output wire [31 : 0] douta
);
endmodule
module ioread(reset,ior,switchctrl,ioread_data,ioread_data_switch);
input reset; // 复位信号
input ior; // 从控制器来的I/O读，
input switchctrl; // 从memorio经过地址高端线获得的拨码开关模块片选
input[15:0] ioread_data_switch; //从外设来的读数据，此处来自拨码开关
output[15:0] ioread_data; // 将外设来的数据送给memorio
reg[15:0] ioread_data;
always @* begin
if(reset == 1)
ioread_data = 16'b0000000000000000;
else if(ior == 1) begin
if(switchctrl == 1)
ioread_data = ioread_data_switch;
else ioread_data = ioread_data;
end
end
endmodule
module leds(led_clk, ledrst, ledwrite, ledcs, ledaddr,ledwdata, ledout);
input led_clk; // 时钟信号
input ledrst; // 复位信号
input ledwrite; // 写信号
input ledcs; // 从memorio来的，由低至高位形成的LED片选信号 !!!!!!!!!!!!!!!!!
input[1:0] ledaddr; // 到LED模块的地址低端 !!!!!!!!!!!!!!!!!!!!
input[15:0] ledwdata; // 写到LED模块的数据，注意数据线只有16根
output[23:0] ledout; // 向板子上输出的24位LED信号
reg [23:0] ledout;
always@(posedge led_clk or posedge ledrst) begin
if(ledrst) begin
ledout <= 24'h000000;
end
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
else if(ledcs && ledwrite) begin
if(ledaddr == 2'b00)
ledout[23:0] <= { ledout[23:16], ledwdata[15:0] };
else if(ledaddr == 2'b10 )
ledout[23:0] <= { ledwdata[7:0], ledout[15:0] };
else
ledout <= ledout;
end
else begin
ledout <= ledout;
end
end
endmodule
module switchs(switclk, switrst, switchread, switchcs,switchaddr, switchrdata, switch_i);
input switclk; // 时钟信号
input switrst; // 复位信号
input switchcs; //从memorio来的，由低至高位形成的switch片选信号 !!!!!!!!!!!!!!!!!
input[1:0] switchaddr; // 到switch模块的地址低端 !!!!!!!!!!!!!!!
input switchread; // 读信号
output [15:0] switchrdata; // 送到CPU的拨码开关值注意数据总线只有16根
input [23:0] switch_i; // 从板上读的24位开关数据
reg [15:0] switchrdata;
always@(negedge switclk or posedge switrst) begin
if(switrst) begin
switchrdata <= 0;
end
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
else if(switchcs && switchread) begin
if(switchaddr==2'b00)
switchrdata[15:0] <= switch_i[15:0]; // data output,lower 16 bits non-extended
else if(switchaddr==2'b10)
switchrdata[15:0] <= { 8'h00, switch_i[23:16] }; //data output, upper 8 bits extended with zero
else
switchrdata <= switchrdata;
end
else begin
switchrdata <= switchrdata;
end
end
endmodule
module top(clk, rst, ioReadCtrl, MemreadCtrl, iowriteCtrl, ledout, switch_i, MemwriteCtrl,
register, RegAddr, RegwriteCtrl, RegreadCtrl, caddress// );
,ioread_data_switch, write_data, mread_data, ledwdata);
input[31:0] caddress; // 需要写入的地址，在memoryio中赋值给address
input clk, rst;
input ioReadCtrl; // read IO, from control32
input MemreadCtrl; // read memory, from control32
input MemwriteCtrl; // write memory, from control32
input iowriteCtrl; // write IO, from control32
input [23:0] switch_i; // 从板上读的24位开关数据
output[23:0] ledout; // 向板子上输出的24位LED信号
input[4:0] RegAddr;
wire SwitchCtrl;
input RegwriteCtrl, RegreadCtrl;
output [31:0] register[0:31];
wire[15:0] switchrdata; // 送到CPU的拨码开关值注意数据总线只有16根
// 辅助信号
output[15:0] ioread_data_switch;
assign ioread_data_switch = switchrdata;
output[31:0] write_data;
output[31:0] mread_data;
output[15:0] ledwdata;
/* 存储器核心单元 */
wire[31:0] read_data; // 从存储单元中获得的数据
wire LEDCtrl;
wire[31:0] rdata; // data from memory or IO that want to read into register
wire[31:0] address; // address to mAddress and I/O
wire[15:0] ioread_data;
wire[31:0] write_data;
wire[31:0] mread_data = MemreadCtrl ? read_data : (RegreadCtrl ? register[RegAddr] : mread_data);
memorio memorioU(.caddress(caddress),
.address(address),
.memread(MemreadCtrl),
.memwrite(MemwriteCtrl),
.ioread(ioReadCtrl),
.iowrite(iowriteCtrl),
.mread_data(mread_data),
.ioread_data(ioread_data),
.wdata(RegreadCtrl ? register[RegAddr] : 32'b0),
.rdata(rdata),
.write_data(write_data), // data to memory or I/O
.LEDCtrl(LEDCtrl), // led 模块的片选信号，高电平有效;
.SwitchCtrl(SwitchCtrl)); //switch 模块的片选信号，高电平有效
/* 拨码开关 */
/* SwitchCtrl & ioReadCtrl 时可读 */
switchs switchsU(.switclk(clk),
.switrst(rst),
.switchread(ioReadCtrl),
.switchcs(SwitchCtrl),
.switchaddr(address[1:0]),
.switchrdata(switchrdata),
.switch_i(switch_i));
/* IO输入的多路选择器 */
/* ioReadCtrl 时可读， SwitchCtrl 时读取拨码开关 */
ioread ioreadU(.reset(rst),
.ior(ioReadCtrl),
.switchctrl(SwitchCtrl),
.ioread_data(ioread_data),
.ioread_data_switch(switchrdata));
/* 存储单元 */
dmemory32 dmemory32(.read_data(read_data),
.address(address),
.write_data(write_data),
.Memwrite(MemwriteCtrl),
.clock(clk));
/* LED 模块 */
wire[1:0] ledaddr = address[1:0];
wire[15:0] ledwdata = ledaddr == 2'b00 ? mread_data[15:0] : mread_data[31:16]; // 写到LED模块的数据，注意数据线只有16根
leds ledsU(.led_clk(clk),
.ledrst(rst),
.ledwrite(iowriteCtrl),
.ledcs(LEDCtrl),
.ledaddr(ledaddr),
.ledwdata(ledwdata),
.ledout(ledout));
/* 内置寄存器 */
reg [31:0] register[0:31];
always@(posedge clk, negedge rst) begin
if (rst) begin
for (integer cnt = 0; cnt < 32; cnt = cnt + 1)
register[cnt] <= 0;
end
else if (RegwriteCtrl == 1'b1) begin
if (address[1:0] == 2'b00)
register[RegAddr][15:0] <= ioread_data;
else
register[RegAddr][31:16] <= ioread_data;
end
end
endmodule
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