github-mirrors/serv
1
0
Fork 0
mirror of https://github.com/olofk/serv.git synced 2025-04-20 03:47:09 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

De-pipeline alu_result_sel

Browse source
This commit is contained in:
Olof Kindgren 2019-09-27 17:48:36 +02:00
parent b9a9e99e2b
commit 574464a33b
1 changed files with 9 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

17
rtl/serv_decode.v
View file

@ -176,16 +176,17 @@ module serv_decode
wire iorjtype = (op_code[0] & ~op_code[2]) | (op_code[2] & ~op_code[0]) | (~op_code[0] & ~op_code[3]);
wire sorbtype = op_code[3:0] == 4'b1000;
always @(posedge clk) begin
always @(funct3)
casez(funct3)
3'b000 : o_alu_rd_sel <= ALU_RESULT_ADD;
3'b001 : o_alu_rd_sel <= ALU_RESULT_SR;
3'b01? : o_alu_rd_sel <= ALU_RESULT_LT;
3'b100 : o_alu_rd_sel <= ALU_RESULT_BOOL;
3'b101 : o_alu_rd_sel <= ALU_RESULT_SR;
3'b11? : o_alu_rd_sel <= ALU_RESULT_BOOL;
endcase // casez (funct3)
3'b000 : o_alu_rd_sel = ALU_RESULT_ADD;
3'b001 : o_alu_rd_sel = ALU_RESULT_SR;
3'b01? : o_alu_rd_sel = ALU_RESULT_LT;
3'b100 : o_alu_rd_sel = ALU_RESULT_BOOL;
3'b101 : o_alu_rd_sel = ALU_RESULT_SR;
3'b11? : o_alu_rd_sel = ALU_RESULT_BOOL;
endcase
always @(posedge clk) begin
if (i_wb_en) begin
o_rf_rd_addr <= i_wb_rdt[11:7];
o_rf_rs1_addr <= i_wb_rdt[19:15];