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writeback tweak

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This commit is contained in:
Eric Matthews 2019-09-01 18:44:10 -07:00
parent c0727257f4
commit f75f981f36
3 changed files with 11 additions and 8 deletions
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4
core/register_file.sv
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@ -94,15 +94,13 @@ module register_file(
in_use_by[rf_decode.future_rd_addr] <= new_id_store;
end
assign rs1_usage = in_use_by[rf_decode.rs1_addr];
assign rs2_usage = in_use_by[rf_decode.rs2_addr];
assign wb_usage = in_use_by[rf_wb.rd_addr];
assign in_use_match = (wb_usage.id == rf_wb.id);
assign rf_wb.rs1_id = rs1_usage.id;
assign rf_wb.rs1_id = rs1_usage.id;
assign rf_wb.rs2_id = rs2_usage.id;
assign rf_wb.rs1_unit_id = rs1_usage.unit_id;
assign rf_wb.rs2_unit_id = rs2_usage.unit_id;

6
core/taiga_config.sv
View file

@ -162,11 +162,11 @@ package taiga_config;
////////////////////////////////////////////////////
//FIFO/Buffer Depths
//All parameters restricted to powers of two
parameter MAX_INFLIGHT_COUNT = 8;
parameter MAX_INFLIGHT_COUNT = 4;
parameter FETCH_BUFFER_DEPTH = 4;
parameter LS_INPUT_BUFFER_DEPTH = 8;
parameter DIV_INPUT_BUFFER_DEPTH = 8;
parameter LS_INPUT_BUFFER_DEPTH = 4;
parameter DIV_INPUT_BUFFER_DEPTH = 4;
////////////////////////////////////////////////////
//Trace Options

9
core/write_back.sv
View file

@ -107,14 +107,19 @@ module write_back(
//One-hot ID retired last cycle
logic [MAX_INFLIGHT_COUNT-1:0] id_retired_last_cycle;
logic [MAX_INFLIGHT_COUNT-1:0] id_retired_last_cycle_r;
always_comb begin
id_retired_last_cycle = 0;
id_retired_last_cycle[retired_id_r] = retired_r;
id_retired_last_cycle[retired_id] = retired;
end
always_ff @ (posedge clk) begin
id_retired_last_cycle_r <= id_retired_last_cycle;
end
//Or together all unit done signals for the same ID.
always_comb begin
id_done = (id_done_r & ~id_retired_last_cycle); //Still pending instructions
id_done = (id_done_r & ~id_retired_last_cycle_r); //Still pending instructions
for (int i=0; i < MAX_INFLIGHT_COUNT; i++) begin
for (int j=0; j< NUM_WB_UNITS; j++) begin
id_done[i] |= unit_done_next_cycle[j] && (unit_instruction_id[j] == i[$clog2(MAX_INFLIGHT_COUNT)-1:0]);