MPC8280 datasheet(936/1386 Pages) FREESCALE

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Multi-Channel Controllers (MCCs)

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

29-46

Freescale Semiconductor

29.10 MCC Initialization and Start/Stop Sequence

The MCC must be initialized and started/stopped in relation with the corresponding TDMs. The following

section presents the initialization and start/stop sequences which must be followed for single and super

channels.

The following is a general sequence for initializing an MCC and its channels after reset:

1. Program the parallel I/O port interface for the TDM to be used (refer to Chapter 41, “Parallel I/O

Ports”).

2. Program the SIU’s interrupt controller to mask or enable MCC-related interrupts as desired (refer

to Section 4.3.1, “Interrupt Controller Registers”).

3. Program the SI’s SIRAM and related registers. If the user wishes to enable the TDM at this time,

the SIRAM programming cannot yet contain MCC-related timeslots. Those timeslots should be

NULL entries and not programmed for MCC usage until after MCC-related initialization is

complete. Refer to Chapter 15, “Serial Interface with Time-Slot Assigner,” for SI programming

details.

4. Initialize buffer descriptors and data buffers as needed.

5. Initialize all MCC global parameters.

6. Initialize MCC channel-specific parameters for channels to be used. (Note that, if SI was not

already enabled in step 3, TSTATE and RSTATE can be fully programmed here to begin data

transmission and reception as soon as the TDM is enabled. If a user wishes to wait until after the

TDM is enabled before starting data transmission and reception, the user may program only the

FCR portions of RSTATE and TSTATE; and STOP TX and STOP RX commands should be issued

for the appropriate channels before enabling the TDM.)

7. Initialize MCC channel-extra parameters for channels to be used.

8. Initialize Superchannel Table if superchannels are to be used.

9. Issue MCC INIT commands as appropriate to make sure all MCC FIFOs that are to be used are

initialized.

10. Enable TDM (or if TDM is already enabled, the user may now reprogram the TDM to include

MCC-related timeslots).

11. If the user did not program a channel’s TSTATE and RSTATE in step 6 to begin data transmission

and reception immediately upon having an active TDM, the user may program the start conditions

at this time.

NOTE

Some steps may be performed out of order. However, it is critical, regardless

of their relative sequence, that steps 5, 6, 7, 8 and 9 occur before the

enabling of the TDM or an active TDM is reprogrammed to include

MCC-related timeslots. Failure to properly initialize MCC parameters and

issue appropriate INIT commands before MCC-related timeslots are

programmed in an active TDM may result in spurious GUN events or other

anomalous behavior.

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