Re: LITE5200B Powerfail

John Rigby wrote on Tue, 19 Dec 2006 10:34:16

According to the Lite5200B schematic
http://www.freescale.com/files/32bit/hardware_tools/schematics/lite5200BSCH.pdf

PSC2_4 is tied to a signal called PWR_DN_CTL_STS via a zero ohm resistor
R88.  If you want to use PSC2_4 as something else you probably need to
remove R88.

You were right, that solved the problem. Resitor should be removed.
Thx for the hint.

   Pedro L.

On 12/15/06, John Rigby [off-list ref] wrote:

quoted

Have you looked at the Lite5200B schematic to see where the signals in
question go?  Maybe you trying to drive something tied to ground high or
vice-versa.

On 12/15/06, Pedro Luis D. L. [off-list ref] wrote:

quoted

Hi all,

I not pretty sure if this is the correct forum to ask for a solution 

but

quoted

I
know that some of you have worked on a driver to make PSCs in this 

board

quoted

work in an I2S mode.

Have you ever have powerfail problems when writing the configuration
registers for this mode?

I´ve delimited the problem:
- GPIO Port Config register stores without problems the value "111" in
bits
25:27 (PSC2 to work in CODEC2 functionality with MCLK).
- When I write a "1" in PSC2->SICR register bit GenClk  to ensure that
clock
and FrameSync are generated internally from MCLK the systems suffers a
powerfail and I suppose that´s consecuence or some kind of 

shortcircuit.

quoted

I´ve followed the same steps made by Bob Peterson in

http://ozlabs.org/pipermail/linuxppc-embedded/2005-September/020210.html

quoted

to write the configuration in the proper registers but I still suffer
the
powerfail when GenClk is activated or, if I activate that bit first,
when
Port Config is written.
I´m also trying to understand how things are done in Roman Fietze 

driver

quoted

but
can´t find a difference. That makes me think that perhaps other
registers
must be modificated before driver loading. Meanwhile, I keep waiting 

for

quoted

Grant Likely release, :-).
Has this happened to someone before?

Thanks for your help.

    Pedro.

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