From bdf05c2c95d6fe92d5350d31a42f106c5b98c043 Mon Sep 17 00:00:00 2001 From: Nick McKinney Date: Thu, 29 Dec 2016 15:58:59 -0600 Subject: support setting PC for branch and jump instructions --- nqcpu.v | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) (limited to 'nqcpu.v') diff --git a/nqcpu.v b/nqcpu.v index 34935c6..c27c742 100644 --- a/nqcpu.v +++ b/nqcpu.v @@ -31,6 +31,9 @@ module nqcpu ( output [15:0] dbg_r7, output [9:0] dbg_state, + output dbg_setPC, + output [15:0] dbg_setPCValue, + output [1:0] dbg_statusreg ); @@ -40,7 +43,8 @@ module nqcpu ( pc = 16'h0; end - wire fetch_en, decode_en, alu_en, incr_pc; + wire fetch_en, decode_en, alu_en, incr_pc, setPC; + wire [15:0] setPCValue; wire fetch_ready; wire [15:0] fetched_instr; @@ -58,6 +62,9 @@ module nqcpu ( if(incr_pc) begin pc <= pc + 16'h2; end + else if (setPC & alu_en) begin + pc <= setPCValue; + end end wire [32:0] ctrl_from_decoder; @@ -130,6 +137,9 @@ module nqcpu ( .memData_in(16'hDEAD), // read in from memory //.memData_out(??), // to write out to memory + .setPC(setPC), + .setPCValue(setPCValue), + .control_signals_out(ctrl_from_alu), .imm_out(imm_from_alu), .pc_out(pc_from_alu), @@ -174,6 +184,7 @@ module nqcpu ( .setRegCond(debugSetRegCond) ); - assign debugPC = pc_from_alu; - + assign debugPC = pc; + assign dbg_setPC = setPC; + assign dbg_setPCValue = setPCValue; endmodule -- cgit v1.2.3