From 218dad65bcc1ce9d386cc858d2e2da9110c6da58 Mon Sep 17 00:00:00 2001
From: adam <adam@megacz.com>
Date: Thu, 21 Aug 2008 11:34:18 +0100
Subject: [PATCH] clean up Lut3 fpga code

---
 ships/Lut3.ship |   79 +++++++++++++++++++++----------------------------------
 1 file changed, 30 insertions(+), 49 deletions(-)

diff --git a/ships/Lut3.ship b/ships/Lut3.ship
index ddbd37a..7781444 100644
--- a/ships/Lut3.ship
+++ b/ships/Lut3.ship
@@ -62,53 +62,35 @@ is considered ``bit zero'').
 == FleetSim ==============================================================
 == FPGA ==============================================================
 
-  reg                    have_in1;
-  reg [(`DATAWIDTH-1):0] reg_in1;
-  reg                    have_in2;
-  reg [(`DATAWIDTH-1):0] reg_in2;
-  reg                    have_in3;
-  reg [(`DATAWIDTH-1):0] reg_in3;
-  reg                    have_inLut;
-  reg [(`DATAWIDTH-1):0] reg_inLut;
+  wire [7:0]              lut;
 
-  wire [(`DATAWIDTH-1):0] out;
   genvar i;
   generate
     for(i=0; i<`DATAWIDTH; i=i+1) begin : OUT
-      assign out[i] = reg_inLut[{reg_in3[i], reg_in2[i], reg_in1[i]}];
+      assign out_d_[i] = lut[{in3_d[i], in2_d[i], in1_d[i]}];
     end
   endgenerate
 
+  assign lut = inLut_d[7:0];
+
   always @(posedge clk) begin
     if (!rst) begin
-      have_in1 = 0;
-      have_in2 = 0;
-      have_in3 = 0;
-      have_inLut = 0;
       `reset
     end else begin
-    if (!have_in1) begin
-      `onread(in1_r, in1_a) have_in1 = 1; reg_in1 = in1_d; end
-      end else
-    if (!have_in2) begin
-      `onread(in2_r, in2_a) have_in2 = 1; reg_in2 = in2_d; end
-      end else
-    if (!have_in3) begin
-      `onread(in3_r, in3_a) have_in3 = 1; reg_in3 = in3_d; end
-      end else
-    if (!have_inLut) begin
-      `onread(inLut_r, inLut_a) have_inLut = 1; reg_inLut = inLut_d; end
-      end else
-  
-    if (have_in1 && have_in2 && have_in3 && have_inLut) begin
-      out_d = out;
-      `onwrite(out_r, out_a)
-        have_in1  = 0;
-        have_in2  = 0;
-        have_in3  = 0;
-        have_inLut = 0;
+      if (!in1_r && in1_a)     in1_a <= 0;
+      if (!in2_r && in2_a)     in2_a <= 0;
+      if (!in3_r && in3_a)     in3_a <= 0;
+      if (!inLut_r && inLut_a) inLut_a <= 0;
+      if (out_r && out_a) begin
+         in1_a <= 1;
+         in2_a <= 1;
+         in3_a <= 1;
+         inLut_a <= 1;
+         out_r <= 0;
+      end
+      if (in1_r && !in1_a && in2_r && !in2_a && in3_r && !in3_a && inLut_r && !inLut_a && !out_r && !out_a) begin
+        out_r <= 1;
       end
-    end
     end
   end
 
@@ -386,16 +368,7 @@ alu.in2:
    [*] deliver;
 alu.inOp:
    literal Alu2.inOp[ADD];
-   load repeat counter with 63;
-   deliver;
-   load repeat counter with 63;
-   deliver;
-   load repeat counter with 63;
-   deliver;
-   load repeat counter with 63;
-   deliver;
-   load repeat counter with 3;
-   deliver;
+   [*] deliver;
 alu.in1:
    literal 0;
    deliver;
@@ -406,15 +379,23 @@ alu.out:
   [L] sendto alu.in1;
   tail;
 
-// acks from debug ship trigger new truth tables
-debug.in:
-  [*] take, deliver, notify alu.out;
-
 lut.inLut:
   literal 0;
   deliver;
   [*] take, deliver;
 
+// acks from debug ship trigger new truth tables
+debug.in:
+  load repeat counter with 63;
+  take, deliver, notify alu.out;
+  load repeat counter with 63;
+  take, deliver, notify alu.out;
+  load repeat counter with 63;
+  take, deliver, notify alu.out;
+  load repeat counter with 63;
+  take, deliver, notify alu.out;
+  load repeat counter with 4;
+  take, deliver, notify alu.out;
 
 
 
-- 
1.7.10.4