From be20c4149da8af929bbdc26f32c17bfcd0981cd9 Mon Sep 17 00:00:00 2001
From: uvok
Date: Thu, 22 Jan 2026 19:53:08 +0100
Subject: Implement JMP

and get rid of arbitrary run limitation.
---
 eater_cpu/eater_decoder.sv | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'eater_cpu/eater_decoder.sv')

diff --git a/eater_cpu/eater_decoder.sv b/eater_cpu/eater_decoder.sv
index 20e3e0b..f6a73e6 100644
--- a/eater_cpu/eater_decoder.sv
+++ b/eater_cpu/eater_decoder.sv
@@ -31,6 +31,7 @@ function CpuState insdep_state;
     SUB: insdep_state = SUB_INS_to_MAR;
     STA: insdep_state = STA_INS_to_MAR;
     LDI: insdep_state = LDI_INS_to_A;
+    JMP: insdep_state = JMP_INS_to_PC;
     OUT: insdep_state = OUT_A_to_OUT;
     HALT_op: insdep_state = HALT_st;
 
@@ -68,6 +69,9 @@ always @(posedge clk_i) begin
 
     LDI_INS_to_A: next_state = PC_to_MAR;
 
+    JMP_INS_to_PC: next_state = JMP_NOP;
+    JMP_NOP: next_state = PC_to_MAR;
+
     OUT_A_to_OUT: next_state = PC_to_MAR;
 
     HALT_st: next_state = HALT_st;
@@ -161,6 +165,14 @@ always_comb begin
         internal_flags.A_in = 1;
     end
 
+    JMP_INS_to_PC: begin
+        internal_flags.INS_out = 1;
+        internal_flags.PC_in = 1;
+    end
+
+    JMP_NOP: begin
+    end
+
     OUT_A_to_OUT: begin
         internal_flags.A_out = 1;
         internal_flags.OUT_in = 1;
-- 
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