P1394 Mail Archive: RE: P1394> Rough SBP-2 & IP1394 core component ROM sizes

P1394 Mail Archive: RE: P1394> Rough SBP-2 & IP1394 core component ROM sizes

RE: P1394> Rough SBP-2 & IP1394 core component ROM sizes

Turner, Randy (rturner@sharplabs.com)
Wed, 11 Feb 1998 08:35:10 -0800

I didn't know chip sets offered "explicit" support for SBP-2. OHCI
maybe, but I hadn't seen the chip set feature in the brochure for
"chip-level SBP-2 support".

Also, since 1394 is a peer-to-peer interface, anyone developing a
peer-to-peer device (like the majority of the Japanese electronics
industry), would have to essentially duplicate the functionality of
SBP-2 initiator and target, whether they actually use SBP-2 to do this,
or some other (potentially proprietary) method for implementing
peer-to-peer functionality.

Randy

-----Original Message-----
From: Stephen Holmstead [SMTP:stephen@hpb16977.boi.hp.com]
Sent: Wednesday, February 11, 1998 8:30 AM
To: 'Turner, Randy'; 'Brian Batchelder'; p1394@pwg.org
Subject: RE: P1394> Rough SBP-2 & IP1394 core component
ROM sizes

My experiences in the past is that combining target AND
initiator
functions into a single device is VERY difficult. The
complexity of the
state tables and ambiguities that can arise make it very
difficult.
Also, I don't believe any of the chip manufacturers support
SBP-2 for
both target and initiator. In my opinion, it's NOT just a
matter of
adding the 15K for the target and 15K for the initiator. The
target and
initiator have vastly different functions. Designing a model
that did
both (well) would be a challenge. It was problems like this
that fueled
many of the AEN (asynchronous event notification) debates.

Stephen

> -----Original Message-----
> From: Turner, Randy [SMTP:rturner@sharplabs.com]
> Sent: Monday, February 09, 1998 1:03 PM
> To: 'Brian Batchelder'; p1394@pwg.org
> Subject: RE: P1394> Rough SBP-2 & IP1394 core component
ROM sizes
>
>
> I am very interested in the combined target/initiator
footprint as
> well.
>
> Thx
>
> Randy
>
>
> -----Original Message-----
> From: Brian Batchelder [SMTP:brianb@vcd.hp.com]
> Sent: Monday, February 09, 1998 9:37 AM
> To: p1394@pwg.org
> Subject: Re: P1394> Rough SBP-2 & IP1394 core
component
> ROM sizes
>
> At 02:04 PM 2/6/98 -0800, Greg Shue wrote:
>
> [snip]
>
> >I approached them about sharing some rough estimates of
code
> size
> >for the IP1394 glue, SBP-2 target and initiator, and
1394 bus
> >manager modules to get a feel for how "heavy" the
protocol
> >implementations really are. They graciously shared the
flowing
> >estimates with us, and certainly deserve our thanks.
Since the
> >technology is still being developed, these
implementations are
> >certainly going to be tuned and the numbers will change
a
> little
> >bit.
> >
> > Component Rough ROM size (KBytes)
> > --------- -----------------------
> > SBP-2 initiator core 15 +/- 5
> > SBP-2 target core 15 +/- 5 (incl. Mgmt+Fetch
agent,
> no exec agent)
>
> Any idea how big a combined SBP-2 target/initiator would
be?
> 15-30K? ;-)
>
> [snip]
>
> Brian
>
>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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