From: Grant Likely <grant.likely@secretlab.ca>
To: Jeff Angielski <jeff@theptrgroup.com>
Cc: Joel Lord <Lord@assurtech.com>, Linuxppc-dev@lists.ozlabs.org
Subject: Re: c67x00 with mpc85xx
Date: Mon, 9 Nov 2009 12:23:05 -0700 [thread overview]
Message-ID: <fa686aa40911091123i6909ec8cme8dfc132d544eab5@mail.gmail.com> (raw)
In-Reply-To: <4AD8CD30.6020003@theptrgroup.com>
On Fri, Oct 16, 2009 at 12:44 PM, Jeff Angielski <jeff@theptrgroup.com> wrote:
>
> We are using the Cypress USB Host (CY7C67300) with a Freescale MPC8544 and
> can only get it to work if we add a delay after writing to the hardware
> registers through the HPI.
>
> We tried playing with the SCY settings in the GPCM but nothing helps. It is
> only when we add usecs of delay after our write() functions that the
> hardware works.
>
> The datasheets make no mention of any write-then-read requirements and the
> FAEs are stumped right now.
>
> I was just hoping somebody had some experiencing interfacing this chip to
> the PowerPC and that they could offer some suggestions or ideas.
I've worked with the part attached to the ppc440 inside a Xilinx FPGA.
Though I ran into many problems, I haven't seen the problem that you
describe. Sorry.
g.
--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
prev parent reply other threads:[~2009-11-09 19:23 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-16 19:44 c67x00 with mpc85xx Jeff Angielski
2009-11-09 19:23 ` Grant Likely [this message]
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