add missing defs.

1 files changed, 6 insertions, 0 deletions

diff --git a/zpu/hdl/zpu4/core/zpu_config.vhd b/zpu/hdl/zpu4/core/zpu_config.vhd
index a13c0bf..ffc144b 100644
--- a/zpu/hdl/zpu4/core/zpu_config.vhd
+++ b/zpu/hdl/zpu4/core/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 or not.

@@ -12,5 +13,10 @@ package zpu_config is
 	constant	ZPU_Frequency		: std_logic_vector(7 downto 0) := x"64";

 	-- This is the msb address bit. bytes=2^(maxAddrBitIncIO+1)

 	constant 	maxAddrBitIncIO		: integer := 15;

+	constant 	maxAddrBitBRAM		: integer := 14;

 	

+	-- start byte address of stack. 

+	-- point to top of RAM - 2*words

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

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

 end zpu_config;