MPC8280 datasheet(107/1386 Pages) FREESCALE

107 / 1386 page

Overview

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

1-13

1.7.1.1

Remote Access Server

Figure 1-3 shows remote access server configuration.

Figure 1-3. Remote Access Server Configuration

In this application, eight TDM ports are connected to external framers. In the MPC8280, each group of

four ports support up to 128 channels. One TDM interface can support 32–128 channels. The MPC8280

receives and transmits data in transparent or HDLC mode, and stores or retrieves the channelized data from

memory. The data can be stored either in memory residing on the 60x bus or in memory residing on the

local bus.

The main trunk can be configured as 155 Mbps full-duplex ATM, using the UTOPIA interface, or as

10/100 BaseT Fast Ethernet with MII interface, or as a high-speed serial channel (up to 45 Mbps). In ATM

mode, there may be a need to store connection tables in external memory on the local bus; for example,

128 active internal connections require 8 Kbytes of dual-port RAM. The need for local bus depends on the

total throughput of the system. The MPC8280 supports automatic (without software intervention) cross-

connect between ATM and MCC, routing ATM AAL1 frames to MCC slots.

The local bus can be used as an interface to a bank of DSPs that can run code that performs analog modem

signal modulation. Data to and from the DSPs can be transferred through the parallel bus with the internal

virtual IDMA.

MPC8280

TDM0

TDM7

Quad

Framer

UTOPIA Multi PHY

60x Bus

SDRAM/DRAM/SRAM

Channelized Data

Local Bus

SDRAM/DRAM/SRAM

ATM

Connection Tables

(up to 256 channels)

SMC/I2C/SPI/SCC

Slow

Comm

PHY

10/100BaseT

E3 clear channel

(takes one TDM)

Slaves

DSP Bank

Local

Bus

(optional)

Framer

MII

Transceiver

155 Mbps

PHY

ATM

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