From: Wolfgang Denk <wd@denx.de>
To: Ricardo Ribalda Delgado <ricardo.ribalda@uam.es>
Cc: jan.nikitenko@gmail.com,
Lorenz Kolb <lorenz@missinglinkelectronics.com>,
dbrownell@users.sourceforge.net, Joachim Foerster <JOFT@gmx.de>,
hp@axis.com, linuxppc-dev@ozlabs.org, mike@steroidmicros.com,
pierre@ossman.eu, joachim@missinglinkelectronics.com,
john.linn@xilinx.com, linuxkernel@vger.kernel.org
Subject: Re: SD card over (xilinx_)SPI, timeout error while CID
Date: Thu, 11 Jun 2009 23:07:51 +0200 [thread overview]
Message-ID: <20090611210751.A7130832E416@gemini.denx.de> (raw)
In-Reply-To: <aa76a2be0906111349s2ff947eo35149ef14e29d05a@mail.gmail.com>
Dear Ricardo Ribalda Delgado,
In message <aa76a2be0906111349s2ff947eo35149ef14e29d05a@mail.gmail.com> you wrote:
>
> > What frequency does Your SPI-Bus use?
>
> 33Mhz.... arghh. just checked is over the standard... Tomorrow I will
> test with a slower clk
Just some really stupid questions:
This is with a 4xx core, right? Is this the same SPI controller design
like in AMCC's 40x and 44x cores, i. e. with a "FIFO" of depth 1?
Assuming you're running your SPI clock at 1 MHz, you get one data
byte and thus one interrupt at a rate of 125 kHz. I doubt your CPU
can handle such a load?
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
A witty saying proves nothing, but saying something pointless gets
people's attention.
next prev parent reply other threads:[~2009-06-11 21:07 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-05 15:34 SD card over (xilinx_)SPI, timeout error while CID Joachim Foerster
2009-06-05 21:15 ` John Linn
2009-06-06 15:14 ` Peter Korsgaard
2009-06-08 15:14 ` Lorenz Kolb
2009-06-09 17:26 ` Joachim Foerster
2009-06-11 19:15 ` Ricardo Ribalda Delgado
[not found] ` <aa76a2be0906111215j15933053rf128f1985a982ca0__26561.0047536486$1244748319$gmane$org@mail.gmail.com>
2009-06-11 20:05 ` Lorenz Kolb
2009-06-11 20:49 ` Ricardo Ribalda Delgado
2009-06-11 21:07 ` Wolfgang Denk [this message]
2009-06-11 21:16 ` Ricardo Ribalda Delgado
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