Re: XC9500 design does not fit into Coolrunner

Klaus Falser <[EMAIL PROTECTED]> wrote:
: Hello,

: I have a rather large design for a XC95288XL which consumes 276 macrocells 
: of 288 possible.
: Since Xilinx seems to prefer Coolrunner devices to the good old XC9500's 
: I tried to stuff the design into a Coolrunner II chip to look how it 
: would behave.

Did you play with the fitter options?

: However, I was not able to make it fit even in a 512 macrocell device.
: Timing should not be so tight, it has to run at 8 MHz clock, but the 
: timing analyzer gives me 17-18 MHz on the slowest 10 ns device.

The Macrocell of the XC2 is not as wide as the cell of the XC95X(V), so some
logic may need expansion on two cells.

: Can anybody which know's the XCR2 better than me give me a hit where 
: to pay attention?
: How can I see from the report where the fitter has a problem?

Did you look look at the *.rpt files?

Bye
-- 
Uwe Bonnes  [EMAIL PROTECTED]

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