MPC8540 datasheet(928/1302 Pages) FREESCALE

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MPC8540 PowerQUICC III Integrated Host Processor Reference Manual, Rev. 1

17-4

Freescale Semiconductor

RapidIO Interface

17.1.2 RapidIO Terminology

Table 17-1 describes terminology used throughout this chapter.

17.1.3 RapidIO Interface Features

This section describes the RapidIO interface features.

17.1.3.1 Supported Features

RapidIO supports the following features of the Parallel RapidIO Interconnect Specification:

•

8-bit interface as defined by the 8/16 LP-EP physical layer specification

•

Support for non-coherent I/O transactions

Table 17-1. RapidIO Terminology

Term

Description

Ack

Acknowledge control symbol

CAR

Capability register

CRC

Cyclic redundancy check

CSR

Command and status register

Domain

Logically associated group of processing elements

Doorbell

Port on a device that generates an interrupt to the processor

Double word

An 8-byte quantity

Header

Part of a packet that contains all of the information about the packet excluding any data

Identifier, the name of a processing element on the RapidIO interconnect

Logical layer

Handles all logic transformations of packets between the protocol layer and the physical layer

LP-LVDS

Low-power, low-voltage differential signaling

Mailbox

Dedicated hardware that receives a message in the message passing unit

Physical layer

Physical handling of the transport of packets over the RapidIO interface

Priority

Relative importance of a transaction or packet; in most systems a higher priority transaction or

packet is serviced or transmitted before a lower priority transaction.

Protocol layer

Handling of packets at the protocol level on the RapidIO interface

Receiver

Destination of a packet on the RapidIO interface, also referred to as a destination or a target

Source

Originator of a packet on the RapidIO interconnect

Symbol

One beat of a packet appearing on the interface pins

Target

Destination of a packet on the RapidIO interface, also referred to as a destination or a receiver

Word

A 4-byte quantity

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