eater: Add cond jump

1 files changed, 15 insertions, 1 deletions

diff --git a/eater_cpu/eater_decoder.sv b/eater_cpu/eater_decoder.sv
index 53ebf78..9239e92 100644
--- a/eater_cpu/eater_decoder.sv
+++ b/eater_cpu/eater_decoder.sv
@@ -5,7 +5,7 @@
 module eater_decoder (
     input clk_i,
     input wire [7:0] instruction_i,
-    input wire AluFlags flags_in,
+    input wire AluFlags alu_flags_in,
 
     output CpuControlFlags flags_o
 );
@@ -34,6 +34,9 @@ function CpuState insdep_state;
     STA: insdep_state = STA_INS_to_MAR;
     LDI: insdep_state = LDI_INS_to_A;
     JMP: insdep_state = JMP_INS_to_PC;
+    JC_op: insdep_state = JC_st_check;
+    JZ_op: insdep_state = JZ_st_check;
+
     OUT_op: insdep_state = OUT_A_to_OUT;
     HALT_op: insdep_state = HALT_st;
 
@@ -75,6 +78,8 @@ always @(posedge clk_i) begin
     JMP_INS_to_PC: next_state = PC_to_MAR;
     JMP_NOP: next_state = PC_to_MAR;
 
+    JC_st_check, JZ_st_check: next_state = PC_to_MAR;
+
     OUT_A_to_OUT: next_state = PC_to_MAR;
 
     HALT_st: next_state = HALT_st;
@@ -179,6 +184,15 @@ always_comb begin
         internal_flags.PC_in = 1;
     end
 
+    JC_st_check: begin
+        internal_flags.INS_out = alu_flags_in.Carry;
+        internal_flags.PC_in =  alu_flags_in.Carry;
+    end
+    JZ_st_check: begin
+        internal_flags.INS_out = alu_flags_in.Zero;
+        internal_flags.PC_in =  alu_flags_in.Zero;
+    end
+
     JMP_NOP: begin
     end