我想编写一个可综合的状态机,以有序的顺序读取/写入叉骨命令。
当前,我定义了一些Verilog宏:
<a class="btn btn-primary primary-bg btn-lg col-md-4 m-2 btn-cus" href="">
<?php foreach($voyage_info as $voyage) { ?>
<h3>Voyage <?=$voyage->voyage_number?></h3>
<small>Schedule</small>
<?php } ?>
</a>
并在我的FSM流程中使用:
`define WB_READ(READ_ADDR) \
begin \
wb_addr_o <= UART_DIV;\
wb_stb_o <= 1'b1; wb_cyc_o <= 1'b1; wb_we_o <= 1'b0; end
`define WB_WRITE(WR_ADDR, WVALUE) \
begin \
wb_addr_o <= WR_ADDR;\
wb_wdat_o <= WVALUE;\
wb_stb_o <= 1'b1; wb_cyc_o <= 1'b1; wb_we_o <= 1'b1; end\
`define WB_NOPE \
begin\
wb_stb_o <= 1'b0; wb_cyc_o <= 1'b0; wb_we_o <= 1'b0; end
每个时间计数为偶数,WB_NOPE状态为“已执行”,每次奇数时,将执行给定的命令。
这在模拟中有效,但是如果我想在状态机的中间添加命令,则必须重新缩进所有{7'hxx,1'b1}状态。并在末尾增加if(count <...)。
有人知道如何(使用宏?)来改进它以避免它吗?
答案 0 :(得分:1)
您只需在case语句中使用一个整数值,然后为每个步骤递增即可。这是代码的简化版本,可以满足您的要求(或者至少足够接近,您可以对其进行修复:-))
module testcase (input logic clk,input logic rst);
enum logic [1:0] { READ,WRITE,NOP } op;
logic [7:0] count;
`define WB_READ begin op <= READ; end
`define WB_WRITE begin op <= WRITE; end
`define WB_NOPE begin op <= NOP; end
logic [6:0] fsm_step_number;
always @(posedge clk or posedge rst)
if(rst) begin
count <= 8'h00;
op <= NOP;
end
else begin
fsm_step_number=1;
case(count)
{(fsm_step_number++), 1'b1}: `WB_READ
{(fsm_step_number++), 1'b1}: `WB_READ
{(fsm_step_number++), 1'b1}: `WB_WRITE
{(fsm_step_number++), 1'b1}: `WB_WRITE
{(fsm_step_number++), 1'b1}: `WB_WRITE
default: `WB_NOPE
endcase
if (count < {(fsm_step_number), 1'b1})
count <= count + 1;
end
assert
endmodule