On Tue, 25 Oct 2011 17:03:16 -0400, you wrote:

>I'm trying to use the bram coregen from ISE. My part is the Spartan 3E 500=
K
>gates with 20 of 18Kbit bram blocks for a total of 368640 bits (according =
to
>the datasheet).
>
>However, the coregen isn't allowing me to fully use all available bits. By
>trying different values, it shows me that (for example), an 8 * 2048 (=3D
>16384 bits) memory consumes one 18Kbit block, which doesn't make sense to
>me. Going over just by one causes it to consume 2 blocks. What's going on
>here?
>
>It won't let me do an 8 * 46080 (=3D 368640) bits memory. It tells me that
>it's more than what's available on my device.

The clue is in the word "Block".=20

The blocks are  not a bucket of single-bit locations, but chunks that can b=
e used in specific
configurations, with powers of 2 as the address inputs.=20
Therefore 2049x8 uses 2 blocks.=20
Larger widths have parity bits available, so 2048x9 can be done in one bloc=
k.=20

If all else fails, read the datasheet!
=20

--=20
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