Motorola MPC8260 User Manual

MOTOROLA

Chapter 27. Multi-Channel Controllers (MCCs)

27-1

Chapter 27
Multi-Channel Controllers (MCCs)

270

The MPC8260Õs two multi-channel controllers (MCC1 and MCC2) each handle up to 128
serial, full-duplex data channels. The 128 channels are divided into four subgroups (of 32
channels each). One or more subgroups can be multiplexed through corresponding SIx
TDM channels; MCC1 connects through SI1, and MCC2 uses SI2.

Each channel can be programmed separately either to perform HDLC formatting/
deformatting or to act as a transparent channel.

27.1 Features

Each MCC has the following features:

Up to 128 independent communication channels.

Independent mapping for receive/transmit.

Supports either transparent or HDLC protocols for each channel.

Up to 256 DMA channels with independent buffer descriptor (BD) tables.

Five interrupt circular tables with programmable size and overßow identiÞcation.
One for transmit and four for receive.

Global loop mode.

Individual channel loop mode.

EfÞcient bus usage (no bus usage for inactive channel or for active channels with
nothing to transmit).

EfÞcient control of the interrupts to the core.

Supports external BD tables.

Uses on-chip dual-port RAM (DPR) for parameter storage.

Uses 64-bit data transactions for reading and writing data in BDs.

Supports automatic routing in transparent mode using negative empty polarity.

Supports inverted data per channel.

Supports super channel synchronization in transparent mode (slot synchronization).

Supports in-line synchronization in transparent mode (synchronization on a pattern
of 2 bytes).