MPC8280 datasheet(111/1386 Pages) FREESCALE

111 / 1386 page

Overview

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

1-17

1.7.1.6

SONET Transmission Controller

Figure 1-8 shows a SONET transmission controller configuration.

Figure 1-8. SONET Transmission Controller Configuration

In this application, the MPC8280 implements super channeling with the MCC. Nine 64-Kbps channels are

combined to form a 576-Kbps channel. The MPC8280 at 133 MHz can support up to sixteen 576-Kbps

superchannels. The MPC8280 also supports subchanneling (under 64 Kbps) with its MCC.

1.7.2

Bus Configurations

The following sections describe the following possible bus configurations:

•

Section 1.7.2.1, “Basic System”

•

Section 1.7.2.2, “High-Performance Communication”

•

Section 1.7.2.3, “High-Performance System Microprocessor”

•

Section 1.7.2.4, “PCI”

•

Section 1.7.2.5, “PCI with 155-Mbps ATM”

•

Section 1.7.2.6, “The MPC8280 as PCI Agent”

1.7.2.1

Basic System

In the basic system configuration, shown in Figure 1-9, the G2_LE core is enabled and uses the 64-bit 60x

data bus. The 32-bit local bus data is needed to store connection tables for many active ATM connections.

The local bus may also be used to store data that does not need to be heavily processed by the core. The

MPC8280

10/100BaseT

60x Bus

SDRAM/DRAM/SRAM

Channelized Data

Local Bus

SDRAM/DRAM/SRAM

ATM

Connection

Tables

SMC/I2C/SPI/SCC

(10BaseT)

(up to 16 channels)

TDM0

TDM3

MII

Transceiver

576 Kbps

SONET

Transceivers

Slow

Comm

PHY

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