diff options
Diffstat (limited to 'zpu/hdl/zpu3/src/zpu_config.vhd')
| -rw-r--r-- | zpu/hdl/zpu3/src/zpu_config.vhd | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/zpu/hdl/zpu3/src/zpu_config.vhd b/zpu/hdl/zpu3/src/zpu_config.vhd new file mode 100644 index 0000000..506121c --- /dev/null +++ b/zpu/hdl/zpu3/src/zpu_config.vhd @@ -0,0 +1,25 @@ +library ieee;
+use ieee.std_logic_1164.all;
+use ieee.std_logic_unsigned.all;
+
+package zpu_config is
+
+ constant Generate_Trace : boolean := false;
+ -- during simulation, set this to '0' to get matching trace.txt
+ constant DontCareValue : std_logic := '0';
+ -- Clock frequency in MHz.
+ constant ZPU_Frequency : std_logic_vector(7 downto 0) := x"64";
+ -- maximum address includes upper bit for IO registers
+ -- the rest is RAM
+ constant maxAddrBit : integer := 14;
+ constant minAddrBit : integer := 2;
+ -- This bit is set for read/writes to IO
+ -- FIX!!! eventually this should be set to wordSize-1 so as to
+ -- to make the address of IO independent of amount of memory
+ -- reserved for CPU. Requires trivial tweaks in toolchain/runtime
+ -- libraries.
+ constant ioBit : integer := maxAddrBit+1;
+ constant wordPower : integer := 5;
+ constant wordSize : integer := 2**wordPower;
+
+end zpu_config;
|
