On Sun, 20 Dec 2009, Kenneth Lerman wrote:
> Date: Sun, 20 Dec 2009 13:41:30 -0500
> From: Kenneth Lerman <kenneth.ler...@se-ltd.com>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <emc-users@lists.sourceforge.net>
> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
> Subject: Re: [Emc-users] Interferometric leadscrew measurement/mapping?
>
> Peter,
>
> What type of counter do you use that can propagate a carry over 32 bits
> in 10 nsec? That's what you need to count at 100 MHz.
>
> Ken
Actually even in Spartan2 150 MHz 32 bit adders/counters are do-able. This is
because the FPGA fabric has special hardware carry look-ahead logic (I think
this is true of all FPGA families from the last 8 years or so)
Peter Wallace
Mesa Electronics
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