* io.vhd: fix address comparsion and added numerous outputs

	during simulation to make things a bit easier
	* zpu_config.vhd: do not use hardcoded startSp, allows more easily
	tinkering w/RAM size

1 files changed, 3 insertions, 1 deletions

diff --git a/zpu/hdl/example/zpu_config.vhd b/zpu/hdl/example/zpu_config.vhd
index a59ac8e..dc2b666 100644
--- a/zpu/hdl/example/zpu_config.vhd
+++ b/zpu/hdl/example/zpu_config.vhd
@@ -1,6 +1,7 @@
 library ieee;

 use ieee.std_logic_1164.all;

 use ieee.std_logic_unsigned.all;

+use ieee.std_logic_arith.all;

 

 package zpu_config is

 	-- generate trace output

@@ -16,5 +17,6 @@ package zpu_config is
 		

 	-- start byte address of stack. 

 	-- point to top of RAM - 2*words

-	constant 	spStart				: std_logic_vector(maxAddrBitIncIO downto 0) := x"1fffff8"; 	

+	constant 	spStart				: std_logic_vector(maxAddrBitIncIO downto 0) :=

+					conv_std_logic_vector((2**(maxAddrBitBRAM+1))/4-8, maxAddrBitIncIO+1);

 end zpu_config;