memory

Hello,
I'm new on this group and I'm complete rookie in vhdl
I have to create model of memory in vhdl for spartan II card. It should
contain 20480x3 of memory. As far as i know spartan have few memory block's
but it's only about 56k, while i need approximately 60kb. I know that i can
use LUT to simulate some memory but i don't know how. I also know that i
have to use some multiplexer and demultiplexer to convert memory addresses
to two parts - one for normal memory and second for LUT memory. Can somebody
help me with this? Maybe some examples or links. How can i use LUT to
simulate memory and how can i connect this two different memory into one
logical memory?

--
Regards
M

Mariusz

> I know that i can
> use LUT to simulate some memory but i don't know how. I also know that i
> have to use some multiplexer and demultiplexer to convert memory addresses
> to two parts - one for normal memory and second for LUT memory. Can
somebody
> help me with this? Maybe some examples or links.

http://www.xilinx.com/bvdocs/appnotes/xapp464.pdf

> how can i connect this two different memory into one
> logical memory?

Use one-bit of address as chip-select/enable to select either the block RAM
or distributed RAM..

Jim Wu
(remove capital letters)
http://www.geocities.com/jimwu88/chips

Jim Wu