On Sat, 10 Nov 2007, Jon Elson wrote:
> Date: Sat, 10 Nov 2007 00:12:54 -0600
> From: Jon Elson <[EMAIL PROTECTED]>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <[email protected]>
> To: "Enhanced Machine Controller (EMC)" <[email protected]>
> Subject: Re: [Emc-users] Low Cost Motion Contorl Card?
>
> Peter C. Wallace wrote:
>> On Fri, 9 Nov 2007, Jon Elson wrote:
>>
>>
>>> Date: Fri, 09 Nov 2007 20:36:30 -0600
>>> From: Jon Elson <[EMAIL PROTECTED]>
>>> Reply-To: "Enhanced Machine Controller (EMC)"
>>> <[email protected]>
>>> To: "Enhanced Machine Controller (EMC)" <[email protected]>
>>> Subject: Re: [Emc-users] Low Cost Motion Contorl Card?
>>>
>>> Peter C. Wallace wrote:
>>>
>>>>
>>>> Besides I dont think parallel port cards are going away any time soon, I
>>>> just
>>>> saw a just released PCI-express - Serial/parallel/localbus chip...
>>>
>>> How much was that PCI-E card? I may have to get a system with
>>> PCI-E and use a parallel card in it to explore the implications
>>> of serializing the communications.
>>>
>>> Thanks for the news flash!
>>>
>>> Jon
>>
>>
>>
>> This was just the chip (MOSCHIP MCS9901), but cards should not be too far
>> behind. I was interested as it can also be used as a cheap PCI-E to 8 bit
>> local bus (ISA) bridge and the serial ports go up to 16 MBaud...
> Hmmmm, 16 MBits/sec? Gee, I could send a 16-byte packet, with
> start and stop bits, in 10 us! And, UARTs are full-duplex. I
> was thinking "what a pity it doesn't have SYN recognition", but
> it is ASYNC, so it doesn't need them. Most likely has
> 16450-style FIFOs, too, and 16 bytes, I'll bet. So, you can
> collect all 16 bytes of the packet in one burst. Definitely an
> interesting alternative, but the parallel port OUGHT to work
> right out of the box with no software changes (I hope).
>
> Thanks,
>
> Jon
The unknown is the read and write overhead from the PCI-E bus, though I doubt
it will be any worse than a PCI parallel port. The UARTs are indeed 16550 type
with 256 byte receive and trasnmit FIFOs
The fact that the parallel port connects via PCI-E should be transparent.
Peter Wallace
Mesa Electronics
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