From 48d11484cc6e0b26627af6259e238fe29421962c Mon Sep 17 00:00:00 2001
From: uvok
Date: Thu, 22 Jan 2026 19:37:00 +0100
Subject: Implement STA

---
 eater_cpu/eater_decoder.sv | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'eater_cpu/eater_decoder.sv')

diff --git a/eater_cpu/eater_decoder.sv b/eater_cpu/eater_decoder.sv
index ad0fd52..fea00e0 100644
--- a/eater_cpu/eater_decoder.sv
+++ b/eater_cpu/eater_decoder.sv
@@ -29,6 +29,7 @@ function CpuState insdep_state;
     LDA: insdep_state = LDA_INS_to_MAR;
     ADD: insdep_state = ADD_INS_to_MAR;
     SUB: insdep_state = SUB_INS_to_MAR;
+    STA: insdep_state = STA_INS_to_MAR;
     OUT: insdep_state = OUT_A_to_OUT;
     HALT_op: insdep_state = HALT_st;
 
@@ -61,6 +62,9 @@ always @(posedge clk_i) begin
     SUB_MEM_to_B: next_state = SUB_ALU_to_A;
     SUB_ALU_to_A: next_state = PC_to_MAR;
 
+    STA_INS_to_MAR: next_state = STA_A_to_MEM;
+    STA_A_to_MEM: next_state = PC_to_MAR;
+
     OUT_A_to_OUT: next_state = PC_to_MAR;
 
     HALT_st: next_state = HALT_st;
@@ -139,6 +143,16 @@ always_comb begin
         internal_flags.A_in = 1;
     end
 
+    STA_INS_to_MAR: begin
+        internal_flags.INS_out = 1;
+        internal_flags.MAR_in = 1;
+    end
+
+    STA_A_to_MEM: begin
+        internal_flags.RAM_in = 1;
+        internal_flags.A_out = 1;
+    end
+
     OUT_A_to_OUT: begin
         internal_flags.A_out = 1;
         internal_flags.OUT_in = 1;
-- 
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