diff options
| -rw-r--r-- | control_unit.v | 14 | ||||
| -rw-r--r-- | nqcpu.v | 2 |
2 files changed, 9 insertions, 7 deletions
diff --git a/control_unit.v b/control_unit.v index 00ebd4f..fa652e0 100644 --- a/control_unit.v +++ b/control_unit.v @@ -1,7 +1,7 @@ module control_unit ( input clk, - input fetch_ready, + input needWait, output fetch_en, output decode_en, @@ -25,11 +25,13 @@ module control_unit ( assign incr_pc = current_state[1]; always @(posedge clk) begin - case(current_state) - 10'b1: if(fetch_ready) current_state <= 10'b10; - 10'b10: current_state <= 10'b100; - 10'b100: current_state <= 10'b1; - endcase + if(!needWait) begin + case(current_state) + 10'b1: current_state <= 10'b10; + 10'b10: current_state <= 10'b100; + 10'b100: current_state <= 10'b1; + endcase + end end assign dbg_state = current_state; @@ -150,7 +150,7 @@ module nqcpu ( control_unit control_unit_inst ( .clk(clk), - .fetch_ready(fetch_ready), + .needWait(fetch_en & !fetch_ready), .fetch_en(fetch_en), .decode_en(decode_en), |