From: "hubert.loewenguth" <hubert.loewenguth@thales-bm•com>
To: linuxppc-embedded@ozlabs•org
Subject: what is the MPC8260 spi maximum rate ?
Date: Tue, 04 Jul 2006 10:12:19 +0200 [thread overview]
Message-ID: <44AA22E3.3050701@thales-bm.com> (raw)
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Hi everybody
I have a question about the spi on the MPC8260.
I have written a driver for this controller but there is something in
the MPC8260 documentation I don't understand:
It is written in MPC8260 documentation (SPI chapter) : " The maximum
sustained data rate that the SPI supports is SYSTEMCLK/50. However the
spi can transfer a single character at much higher rates (SYSTEMCLK/4 in
master mode)".
My really stupid question is ...... what is "SYSTEMCLK" ???????
is it the BRG_CLK ? the CPM_CLK or the CPU_CLK ????
Seeing that in the SPMODE register, the maximum SPI CLK possible is
BRG_CLK/4, I imagine that this "SYSTEMCLK" is BRG_CLK, but this looks
very strange .....
This question is quite stupid but very important for me in order to know
if that controller permit to exchange data with one of our extention
board at 1.2 MHz.
Anybody knows ?
Thanks very much for any help .
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next reply other threads:[~2006-07-04 8:12 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-04 8:12 hubert.loewenguth [this message]
2006-07-04 19:49 ` what is the MPC8260 spi maximum rate ? Wolfgang Denk
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