From: Joshua Wise <joshua@rebirth.joshuawise.com>
Date: Tue, 18 Mar 2008 05:30:45 +0000 (-0400)
Subject: Fixed statekick once and for all, hopefully.
X-Git-Tag: PRE_ROLLBACK~10
X-Git-Url: http://git.joshuawise.com/mandelfpga.git/commitdiff_plain/251788d85bd34ae72b677875e924d56768b409f7?ds=inline;hp=265061f2b080c0ea2b18d0a1f7b92de658a5ad92

Fixed statekick once and for all, hopefully.
---

diff --git a/Main.v b/Main.v
index ad8e90c..3dc546b 100644
--- a/Main.v
+++ b/Main.v
@@ -262,19 +262,21 @@ module Mandelbrot(
 	                stageci[2];
 	
 	reg [7:0] out;
-	reg typethea = 0;	// Whether we have typed the A.
-	reg statekick = 0;	// State needs to be kicked back to 3'b010 on the next mclk.
-
-	// This is guaranteed to converge after two pixclks.
+	
+	// We detect when the state should be poked by a high negedge followed
+	// by a high posedge -- if tha thappens, then we're guaranteed that the
+	// state following the current state will be 100.
+	reg lastneg;
 	always @(negedge mclk)
-		if (pixclk && !statekick) begin
-			statekick <= 1;
-		end else if (statekick) begin // This is the edge of the falling anus.
-			statekick <= 0;
-		end
+		lastneg <= pixclk;
 	
 	always @(posedge mclk)
 	begin
+		if (lastneg && pixclk)	// If a pixclk has happened, the state should be reset.
+			state <= 3'b100;
+		else						// Otherwise, just poke it forward.
+			state <= {state[1], state[0], state[2]};
+	
 		// Data output handling
 		if (state[0]) begin
 			{red, green, blue} <= {out[0],out[3],out[6],out[1],out[4],out[7],out[2],out[5]};
@@ -308,11 +310,6 @@ module Mandelbrot(
 			stageb[1] <= mb[`MAXOUTN];
 			stageci[1] <= curiter[`MAXOUTN];
 		end
-		
-		if (statekick)		// If a pixclk has happened, the state should be reset.
-			state <= 3'b010;
-		else						// Otherwise, just poke it forward.
-			state <= {state[1], state[0], state[2]};
 	end
 
 	MandelUnit mu0(