Re: [partial-reconfig] Another BM Question...

[<jedward@xxxxxxxxxx>]

Hello,

It's ok, in my design I colocate the reconfigurable part in the leftmost
position, and to utilize 2 CLB columns(left) i have to use bit 0 and 1 to
go left to right and the bits 2 and 3 to go right to left.
I don't know exaclty why?.. but if you utilize the bus macro in one
direction, the tool don't work due to routing problems!. Besides that, one
advantage could be you utilize only two CLB columns instead of 4 CLB
columns, this can be useful in some cases where you need area
optimization.
Best regards.

***************************************************
JOHN EDWARD ESQUIAGOLA ARANDA

Master Student - Electrical Engineering
Microelectronis Laboratory of São Paulo University
São Paulo - SP - Brazil
***************************************************


> Hi...
>
> Just noticed something in xapp290 that I hadn't noticed earlier...
>
> In Appendix C, it says...
>
> "5. If the bus macro is in the leftmost position, bits 2 and 3 cannot
> go left-to-right.
> 6. If the bus macro is in the rightmost position, bits 0 and 1 cannot
> go right-to-left."
>
> I can't seem to understand what this means or implies... does it mean
> that if two modules A and B are communicating using a BM and A lies at
> the left edge of the FPGA, it cannot send bits 2 and 3 to B if the BM
> falls on x=0? If so, why?
>
> Needless to say, a design revision looms threatningly on the horizon if
> this is so... :( ...
>
> Sincerely,
> Umar
>
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