RE: New project...PCI based servo control board

["Craig Edwards" <cedwards-at-ceinetworks.com>]

Yea... I thought you would see the irony it this suggestion...:)  But one
difference is that that we're still envisioning the motor drive I/O ( X 8 )
to be a separate set of I/O registers hanging off the PCI bus.  I don't
disagree that the added performance is probably not needed at this stage,
but I think it will allow for more options / innovations in the future,
especially for tightly coupled servo control.   

But for today I agree the EPP is completely adequate...:)

Craig Edwards

-----Original Message-----
From: emc-at-nist.gov [emc-at-nist.gov] On Behalf Of Jon Elson
Sent: Tuesday, April 01, 2003 1:53 AM
To: Multiple recipients of list
Subject: Re: New project...PCI based servo control board





jekasunich-at-worldnet.att.net wrote:

>Craig wrote:
>
>  
>
>>>>One closing thought on board #2, I'd like to consider a SIMPLE bus 
>>>>expander be included on it
>>>>        
>>>>
>
>  
>
>>>Excellent idea!  Why waste FPGA gates on simple input and output 
>>>ports. Let the FPGA implement an expandable bus.
>>>
Ah HA!  I KNEW it!  You'd eventually reinvent what I already have been 
doing.
Except, the PC ALREADY has an expandable, bidirectional, 8-bit data bus! The
EPP Parallel Port!  its fast, very low CPU load (1 cpu instruction/byte
transferred) the protocol is totally managed in hardware, etc.

Jon