Add halt state and flag

1 files changed, 7 insertions, 0 deletions

diff --git a/eater_cpu/eater_decoder.sv b/eater_cpu/eater_decoder.sv
index 78d4e6c..53cc39c 100644
--- a/eater_cpu/eater_decoder.sv
+++ b/eater_cpu/eater_decoder.sv
@@ -28,6 +28,7 @@ function CpuState insdep_state;
     LDA: insdep_state = LDA_INS_to_MAR;
     ADD: insdep_state = ADD_INS_to_MAR;
     OUT: insdep_state = OUT_A_to_OUT;
+    HALT_op: insdep_state = HALT_st;
 
     default: insdep_state = INIT;
     endcase
@@ -54,6 +55,8 @@ always @(posedge clk_i) begin
 
     OUT_A_to_OUT: next_state = PC_to_MAR;
 
+    HALT_st: next_state = HALT_st;
+
     default: begin
        next_state = INIT; 
     end
@@ -115,6 +118,10 @@ always_comb begin
         internal_flags.OUT_in = 1;
     end
 
+    HALT_st: begin
+        internal_flags.halt = 1;
+    end
+
     default: begin
     end