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Date: Wed, 3 Jan 2007 11:48:47 -0800
From: Andrew Sharp <andy.sharp@onstor.com>
To: "Brian Stark" <brian.stark@onstor.com>, dl-cougar@onstor.com
Subject: Re: Standalone SSC processor
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On Wed, 3 Jan 2007 09:57:25 -0800 "Brian Stark"
<brian.stark@onstor.com> wrote:

> Hi,
> 
> Just an update on the discussion that we had yesterday in the Cougar
> meeting.  Broadcom has the SiByte 1125H processor that provides the
> following:
> 
> - 1 CPU core
> - 32-bit PCI bus
> - 2 * GE interfaces
> - DDR memory controller
> - 2 UARTs
> 
> I am going to look at using the 1125 as a standalone processor, and as
> we discussed yesterday, this will largely be a function of board space
> and cost.  If we move forward with the 1125, then I would propose
> eliminating the BCM5715 dual MAC and using the native GE interfaces of
> the 1125.  I would also look at using soldered-down DDR1 SDRAM that is
> fixed at 512MB if that helps with the layout.

While we are getting rid of the separate dual gigE chip, we could also
get rid of the separate south bridge chip and run the PCI-X bus of the
1480s at 64 bits/133MHz, and put the Qlogic controllers directly on that
bus.  The 32 bit PCI bus on the 1125 can handle the CF controller at
that point.  The Qlogics could DMA directly into the 1480s memory
without the latency of going through another bus/bottleneck, as well as
eliminating the notion that the FPs are best run on the second node.

Cheers,

a
