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store current PC for the currently decoding instruction

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This commit is contained in:
Raphaël Jacquot 2019-03-03 13:34:00 +01:00
parent b58be38b10
commit 28a81503eb
1 changed files with 8 additions and 3 deletions
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11
saturn_inst_decoder.v
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@ -36,6 +36,8 @@ module saturn_inst_decoder (
i_reg_p, i_reg_p,
i_current_pc, i_current_pc,
o_instr_pc,
o_alu_reg_dest, o_alu_reg_dest,
o_alu_reg_src_1, o_alu_reg_src_1,
o_alu_reg_src_2, o_alu_reg_src_2,
@ -63,6 +65,8 @@ input wire [3:0] i_nibble;
input wire [3:0] i_reg_p; input wire [3:0] i_reg_p;
input wire [19:0] i_current_pc; input wire [19:0] i_current_pc;
output reg [19:0] o_instr_pc;
output reg [4:0] o_alu_reg_dest; output reg [4:0] o_alu_reg_dest;
output reg [4:0] o_alu_reg_src_1; output reg [4:0] o_alu_reg_src_1;
output reg [4:0] o_alu_reg_src_2; output reg [4:0] o_alu_reg_src_2;
@ -156,11 +160,12 @@ always @(posedge i_clk) begin
if (!i_debug_cycle && !i_bus_busy) begin if (!i_debug_cycle && !i_bus_busy) begin
if (i_phases[1] && !decode_started) begin if (i_phases[1] && !decode_started) begin
$display("DECODER %0d: [%d] store current PC as instruction start %5h", i_phase, i_cycle_ctr, i_current_pc); // $display("DECODER %0d: [%d] store current PC as instruction start %5h", i_phase, i_cycle_ctr, i_current_pc);
o_instr_pc <= i_current_pc;
end end
if (i_phases[2] && !decode_started) begin if (i_phases[2] && !decode_started) begin
$display("DECODER %0d: [%d] start instruction decoding %h", i_phase, i_cycle_ctr, i_nibble); $display("DECODER %0d: [%d] nb= %h - start instruction decoding", i_phase, i_cycle_ctr, i_nibble);
decode_started <= 1'b1; decode_started <= 1'b1;
case (i_nibble) case (i_nibble)
@ -169,7 +174,7 @@ always @(posedge i_clk) begin
end end
if (i_phases[2] && decode_started) begin if (i_phases[2] && decode_started) begin
$display("DECODER %0d: [%d] decoding %h", i_phase, i_cycle_ctr, i_nibble); $display("DECODER %0d: [%d] nb= %h - decoding", i_phase, i_cycle_ctr, i_nibble);
if (block_2x) begin if (block_2x) begin
$display("DECODER %0d: [%d] P= %h", i_phase, i_cycle_ctr, i_nibble); $display("DECODER %0d: [%d] P= %h", i_phase, i_cycle_ctr, i_nibble);