eater: ALU outputs flags

1 files changed, 14 insertions, 1 deletions

diff --git a/eater_cpu/eater_computer.sv b/eater_cpu/eater_computer.sv
index 75a54c9..b22096a 100644
--- a/eater_cpu/eater_computer.sv
+++ b/eater_cpu/eater_computer.sv
@@ -41,6 +41,9 @@ wire [7:0]
       OUT_out
 ;
 
+// ALU flags. int: direct out. out: buffered output (for decoder).
+wire AluFlags ALU_flags_int, ALU_flags_out;
+
 // PC is only 4 bit.
 wire [3:0] PC_in, PC_out;
 
@@ -134,7 +137,8 @@ eater_alu alu (
   .A_in(A_out),
   .B_in(B_out),
   .subtract_n_add_in(flags.ALU_subtract_nadd),
-  .bus_out(bus)
+  .bus_out(bus),
+  .flags_out(ALU_flags_int)
 );
 
 assign PC_in = bus[3:0];
@@ -167,6 +171,15 @@ eater_register OUT_reg (
   .always_out(OUT_out)
 );
 
+eater_register ALU_flags (
+  .clk_in(clk_in),
+  .en_store_in(flags.flags_in),
+  .en_output_in(1'b0),
+  .data_in(ALU_flags_int),
+  .bus_out(),
+  .always_out(ALU_flags_out)
+);
+
 // run decoder on negated clock,
 // allowing stuff to be clocked in "early"
 wire DEC_clk_neg = ~clk_in;