RE: [ethmac] what's the meaning of "delayed crc"?

["Illan Glasner" <iglasner@zumanetworks.com>]

   Hi,

      As far as I can think you never want to have delay crc as crc give
you protection on the data and even when you add headers you should
protect them with the crc, just imagine what you system might do if some
of the heareds but get change and you have no knowledge about it ...

who ever get a packet with headers is already not a "pure ethernet" and
so if this module check crc simple tell him to check the crc of all the
packet.

my 2c is always have the crc on all the packet wether it have or don;t
have headers etc.

have a nice day

   Illan


-----Original Message-----
From: Igor Mohor [mailto:igorm@opencores.org]
Sent: Friday, January 11, 2002 12:49 AM
To: ethmac@opencores.org
Subject: RE: [ethmac] what's the meaning of "delayed crc"?


If you put some header that is not part of the data frame and want that
crc
is calculated without that header, then delayed crc should be used.
Normally
you won't need that.

Regards,
	Igor

> -----Original Message-----
> From: owner-ethmac@opencores.org [mailto:owner-ethmac@opencores.org]On
> Behalf Of jcwh@sina.com
> Sent: 10. januar 2002 5:14
> To: ethmac@opencores.org
> Subject: [ethmac] what's the meaning of "delayed crc"?
>
>
> could someone tell me
> when should i set the DlyCrcEn,
> and when should i not?
> thanks!
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