- reworked FIFOs

- use synchronous resets

git-svn-id: http://moon:8086/svn/vhdl/trunk@1090 cc03376c-175c-47c8-b038-4cd826a8556b

lib/FIFO/src/gray_counter.vhd

@@ -60,25 +60,21 @@ begin
 	bcnt	<= cntb;
 	gcnt	<= cntg;
 
-	process(rst, clk, ce, cntb, nxtb)
-	begin
-		if rst = '1' then
-			cntb	<= to_unsigned(init_value, width);
-			nxtb	<= to_unsigned(init_value, width);
-			nxtg	<= to_unsigned(init_value, width);
-			cntg	<= to_unsigned(init_value, width);
-		else
-			if rising_edge(clk) then
-				cntg	<= nxtg;
-				cntb	<= nxtb;
-			end if;	
-			nxtg <= bin2gray(nxtb);
-			nxtb <= cntb;
-			if ce = '1' then
-				nxtb <= cntb + 1;
-			end if;	
-		end if;	
-	end process;
-
+	nxtg <= bin2gray(nxtb);
+	nxtb <= (cntb + 1) when ce = '1' else cntb;
+
+	process(clk)
+	begin
+		if rising_edge(clk) then
+			if rst = '1' then
+				cntb	<= to_unsigned(init_value, width);
+				cntg	<= to_unsigned(init_value, width);
+			else
+				cntg	<= nxtg;
+				cntb	<= nxtb;
+			end if;
+		end if;	
+	end process;
+
 end Behavioral;