MPC860 family - Transparent SMC using TSA (time slot assigner)

From: Lars Poulsen (lars_at_beagle-ears.com)
Date: 07/15/04 

Date: 14 Jul 2004 18:19:59 -0700

I am writing a device driver to interface two E1 channels to an MPC860
using the Time Slot Assigner. I have two Maxim/Dallas framers interfaced
to TDM-A and TDM-B, respectively.

The A channel is serviced using SCC2 in transparent mode, and it works
wonderfully, both for receive and transmit.

The B channel is serviced using SMC2 in transparent mode, and it is
erratic on the transmit side, while the receive side works as expected.

The problem I see, is that transmit synchronization does not reliably
occur on the frame sync pulse, but offset by a varying number of
timeslots. Once started, the channel maintains its frame alignment
(i.e. the back to back frames stay syncronized with the wrong offset.)
It is almost as if the SMC had managed to latch into "inherent
synchronization", as described under the SCC.

I would be grateful if anyone with experience in operating a QUICC
SMC in ransparent mode with a Time Slot Assigner would contact me.

/ Lars Poulsen

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