Motorola PowerQUICC II MPC8280 Series Reference Manual page 939

Chapter 29
Multi-Channel Controllers (MCCs)
The MPC8270 and the MPC8275 have only one MCC. Refer
to www.motorola.com/semiconductors for the latest RAM
microcode packages that support enhancements.
A multi-channel controller (MCC) allows the MPC8280 to support up to 128 separate
time-division serial channels on one peripheral. The MPC8280 has two MCCs. Each MCC
is paired with a serial interface (SI), allowing the MCC to communicate over any of that
SI's 4 time-division multiplexed streams (TDM).
An MCC's channels are assigned to a particular TDM in subgroups of 32 channels. MCC1's
channels (0-127) may not be programmed to work with SI2, nor MCC2's channels
(128-255) to work with SI1. Each channel of an MCC can be programmed to perform in a
mode separate from the other channels of that MCC.
Proper programming of the SI and SIRAM is responsible for the routing of timeslots within
a TDM stream to the appropriate MCC channel at the desired time. Programming the SI is
covered in Chapter 15, "Serial Interface with Time-Slot Assigner." Users should be
familiar with the information there before proceeding.
Each MCC has the following features:
• Up to 128 independent HDLC or transparent communication channels or up to
64 SS7 channels
• Independent mapping for receive/transmit
• Supports HDLC, transparent, or SS7 protocols on a per-channel basis
• Supports additional circuit emulation service functionality when used in conjunction
with ATM AAL1
• Supports interworking with AAL0
• Up to 256 DMA channels with independent buffer descriptor (BD) tables
• Five interrupt circular tables with programmable size and overflow identification.
One for transmit and four for receive.
• Global loop mode
MOTOROLA
Freescale Semiconductor, Inc.
NOTE
Chapter 29. Multi-Channel Controllers (MCCs)
For More Information On This Product,
Go to: www.freescale.com
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