Looks like the main improvement over VirtexIIpro is the reduction in time to
get on and off the carry chain. Tbyp is 88ps = 44ps/bit in the slowest
VIIpro. But the time on and off the chain, e.g. Topcyf is about twice as
quick in the V4, saving c.400ps meaning you get more than 16 bits longer a
counter at the same speed.
Cheers, Syms.
"Philip Freidin" <[email protected]> wrote in message
news:[email protected]..
>
>
> Looks like a 32 bit counter hits 360 MHz, in a -11, with preliminary
> speed files. Gotta love the 41.5 ps/bit carry chain.
>
>>
> Philip
>
> Philip Freidin
> Fliptronics