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library ieee ;
use ieee.std_logic_1164.all ;
entity tb3 is
end;
architecture behav of tb3 is
begin
process
function InitMemoryBaseType(Size : integer) return integer_vector is
begin
return ((Size + 31) / 32 downto 1 => 0);
end;
subtype MemoryBaseType is integer_vector ;
type MemBlockType is array (integer range <>) of MemoryBaseType ;
type MemBlockPtrType is access MemBlockType ;
type MemArrayType is array (integer range <>) of MemBlockPtrType ;
type MemArrayPtrType is access MemArrayType ;
type MemStructType is record
MemArrayPtr : MemArrayPtrType ;
AddrWidth : integer ;
DataWidth : natural ;
BlockWidth : natural ;
MemoryBaseTypeWidth : natural ;
end record MemStructType ;
variable MemStructPtr : MemStructType := (NULL, -1, 1, 0, 0);
procedure MemInit (AddrWidth, DataWidth : integer ) is
constant ADJ_BLOCK_WIDTH : integer := 10;
begin
MemStructPtr.AddrWidth := AddrWidth ;
MemStructPtr.DataWidth := DataWidth ;
MemStructPtr.MemoryBaseTypeWidth := (DataWidth + 31) / 32;
MemStructPtr.BlockWidth := ADJ_BLOCK_WIDTH ;
MemStructPtr.MemArrayPtr := new MemArrayType(0 to 2**(AddrWidth-ADJ_BLOCK_WIDTH)-1) ;
end procedure MemInit ;
------------------------------------------------------------
procedure MemWrite (
------------------------------------------------------------
Addr : std_logic_vector ;
Data : std_logic_vector
) is
variable BlockWidth : integer ;
variable MemoryBaseTypeWidth : integer ;
variable BlockAddr, WordAddr : integer ;
begin
BlockWidth := MemStructPtr.BlockWidth ;
MemoryBaseTypeWidth := MemStructPtr.MemoryBaseTypeWidth ;
BlockAddr := 0 ;
assert MemoryBaseTypeWidth = 1;
-- If empty, allocate a memory block
if MemStructPtr.MemArrayPtr(BlockAddr) = NULL then
MemStructPtr.MemArrayPtr(BlockAddr) := new MemBlockType(0 to 2**BlockWidth-1)(MemoryBaseTypeWidth downto 1) ;
MemStructPtr.MemArrayPtr(BlockAddr)(0 to 2**BlockWidth-1) := (0 to 2**BlockWidth-1 => InitMemoryBaseType(Data'length)) ;
end if ;
end procedure MemWrite ;
begin
MemInit(AddrWidth => 20, DataWidth => 16);
MemWrite(x"00000", x"0000");
wait;
end process;
end ;
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