MPC8540 datasheet(1009/1302 Pages) FREESCALE

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Functional Description

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

Freescale Semiconductor

17-85

Table 17-84 summarizes packet formats. The following definitions and Figure 17-81 accompany

the table.

•

PMF—Physical maintenance field; prefixed to each packet format (see Figure 17-81)

•

TYPE —Packet type (1, 2, 5, 6, 8, 10, 11, 13)

•

TARID —target_id: the receiver’s ID within its domain

•

SRCTID— Packet transaction ID

•

TTYPE—Transaction type to be performed by the recipient

•

RDSIZE—Read data size requested

•

WRSIZE—Write data size requested

•

SRCID—source_id: the packet sender’s ID within its domain

•

ADDR—Address for the requested operation

•

MSB—Most-significant byte

•

LSB —Least-significant byte

•

HOPCNT—hop_count selects the distance into the switch network to access

•

CONFIG_OFFSET—Double-word offset into the CAR/CSR register file

•

INFO—Doorbell information field; provided and used by software only

•

MSGLEN—Total number of packets comprising the message

•

MSGSEG—Portion of the message supplied by the packet

•

SSIZE—Standard message packet data size

•

MBOX—Recipient mailbox number at the target device

•

LETTER—Identifies message within the mailbox

•

STATUS—Packet response status field

•

TARINFO—Target_info used for messages only. Field length is 8 bits:

letter (2) + mbox (2) + msgseg (4)

•

W—Word pointer; used in the decoding of the transaction size

Message

class

message

Message

passing

M = 0 write type operation

done, retry, error None

Response

class

response

All

N/A

Depends on the

request

Table 17-83. RapidIO Transaction Summary (continued)

Packet

Format

RapidIO

Transaction

Programming

Model

Possible Processor

Operations

Possible

RapidIO

Responses

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