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Add initial hazard unit

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This commit is contained in:
Graham Edgecombe 2017-12-04 21:26:26 +00:00
parent 310c275ba2
commit 4c2c44e94d
2 changed files with 65 additions and 8 deletions
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43
rv32.sv
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@ -4,6 +4,7 @@
`include "rv32_decode.sv"
`include "rv32_execute.sv"
`include "rv32_fetch.sv"
`include "rv32_hazard.sv"
`include "rv32_mem.sv"
module rv32 (
@ -15,10 +16,36 @@ module rv32 (
leds <= mem_rd_value[7:0];
end
logic fetch_stall;
logic fetch_flush;
logic decode_stall;
logic decode_flush;
logic execute_stall;
logic execute_flush;
logic mem_stall;
logic mem_flush;
rv32_hazard hazard (
.fetch_stall_out(fetch_stall),
.fetch_flush_out(fetch_flush),
.decode_stall_out(decode_stall),
.decode_flush_out(decode_flush),
.execute_stall_out(execute_stall),
.execute_flush_out(execute_flush),
.mem_stall_out(mem_stall),
.mem_flush_out(mem_flush)
);
rv32_fetch fetch (
.clk(clk),
.stall(0),
.flush(0),
.stall(fetch_stall),
.flush(fetch_flush),
/* control in (from mem) */
.branch_taken_in(mem_branch_taken),
@ -37,8 +64,8 @@ module rv32 (
rv32_decode decode (
.clk(clk),
.stall(0),
.flush(0),
.stall(decode_stall),
.flush(decode_flush),
/* control in (from writeback) */
.rd_in(mem_rd),
@ -98,8 +125,8 @@ module rv32 (
rv32_execute execute (
.clk(clk),
.stall(0),
.flush(0),
.stall(execute_stall),
.flush(execute_flush),
/* control in */
.rs1_in(decode_rs1),
@ -161,8 +188,8 @@ module rv32 (
rv32_mem mem (
.clk(clk),
.stall(0),
.flush(0),
.stall(mem_stall),
.flush(mem_flush),
/* control in */
.read_en_in(execute_mem_read_en),

30
rv32_hazard.sv Normal file
View file

@ -0,0 +1,30 @@
`ifndef RV32_HAZARD
`define RV32_HAZARD
module rv32_hazard (
output fetch_stall_out,
output fetch_flush_out,
output decode_stall_out,
output decode_flush_out,
output execute_stall_out,
output execute_flush_out,
output mem_stall_out,
output mem_flush_out
);
assign fetch_stall_out = decode_stall_out;
assign fetch_flush_out = 0;
assign decode_stall_out = execute_stall_out;
assign decode_flush_out = fetch_stall_out;
assign execute_stall_out = mem_stall_out;
assign execute_flush_out = decode_stall_out;
assign mem_stall_out = 0;
assign mem_flush_out = execute_stall_out;
endmodule
`endif