X-Git-Url: http://git.joshuawise.com/firearm.git/blobdiff_plain/dfe0713aebc58dd093c309011ac0596597ab2cb5..d73619a2a0e4f5876da7f7f413fef61e40a7e063:/Decode.v?ds=inline diff --git a/Decode.v b/Decode.v index 9bfb03d..2c22746 100644 --- a/Decode.v +++ b/Decode.v @@ -2,6 +2,7 @@ module Decode( input clk, + input stall, input [31:0] insn, input [31:0] inpc, input [31:0] incpsr, @@ -180,7 +181,7 @@ module Decode( read_2 = insn[15:12]; op0_out = regs0; - if(insn[25]) begin + if(!insn[25] /* immediate */) begin op1_out = {20'b0, insn[11:0]}; carry_out = incpsr[`CPSR_C]; end else begin @@ -226,12 +227,15 @@ module Decode( always @ (posedge clk) begin - op0 <= op0_out; /* Rn - always */ - op1 <= op1_out; /* 'operand 2' - Rm */ - op2 <= op2_out; /* thirdedge - Rs */ - carry <= carry_out; - outcpsr <= incpsr; - outspsr <= inspsr; + if (!stall) + begin + op0 <= op0_out; /* Rn - always */ + op1 <= op1_out; /* 'operand 2' - Rm */ + op2 <= op2_out; /* thirdedge - Rs */ + carry <= carry_out; + outcpsr <= incpsr; + outspsr <= inspsr; + end end endmodule