MPC8280 datasheet(115/1386 Pages) FREESCALE

115 / 1386 page

Overview

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

1-21

This system supports PCI and implements a 155-Mbps, full-duplex ATM with more than 128 active

connections. The MPC8280 cannot support both functions simultaneously. The local bus is needed to store

ATM connection tables. Therefore, an external PCI bridge is necessary. In systems with fewer than 128

active connections or where the ATM average bit rate is lower that 155 Mbps, the local bus may not be

necessary to store connection tables, and it may be possible to use it as PCI bus.

1.7.2.6

The MPC8280 as PCI Agent

Figure 1-14 shows the configuration when the MPC8280 acts as the PCI agent.

Figure 1-14. MPC8280 as PCI Agent

In this system, the MPC8280 is a PCI agent on an I/O card and the PCI host resides on the PCI bus. An

external PCI bridge is used to connect the host to the PCI bus. The internal PCI bridge in the MPC8280 is

used to bridge between the PCI bus and the 60x bus on the MPC8280.

PCI Bus

60x Bus

SDRAM/SRAM/DRAM

ATM Connection Tables

and/or

MPC8280

Communication

Channels

UTOPIA

PHY

ATM

PHY

PCI Bridge

System Bus

Host

Processor

Agent

Host

Memory

Communication Data

MPC8280 数据表(PDF) 115 Page - Freescale Semiconductor, Inc

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