Spartan6 distributed RAM- why no x4 and x8 configurations ?

B

Brane2

Guest
Hi to all,

I have installed Webpack 12.2 and am getting acquainted with Spartan6.
While reading "Spartan6 CLB User Guide( ug384.pdf )" I came up to page
15 -"Distributed RAM and MEmory (SLICEM only)" and noticed that there
is no x4 or x8 configuration, and there is no explanation of that,
neither it is self-evident from diagrams.

Is there some fundamental routing resources limitation or something
similar ?
 

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