MPC8540 datasheet(1019/1302 Pages) FREESCALE

1019 / 1302 page

RapidIO Functionality

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

Freescale Semiconductor

17-95

Recoverable errors are typically transmission errors or physical layer protocol violation errors, and

the recovery algorithm can be used to maintain communications on the link without losing any

data. A compliant device must recover from a single error. Recovery from multiple errors is not

required. The device is always the target for error detection.

Device can accept embedded control symbols

9A. DETAIL: Packet-accepted control symbol

9B. DETAIL: Packet-retry control symbol

9C. DETAIL: Packet-not-accepted control symbol

9D. DETAIL: Idle control symbol

9E. DETAIL: Throttle control symbol

9F. DETAIL: TOD-sync control symbol

9G. DETAIL: Link-response control symbol

TOD-sync control symbol is treated as idle control symbol if TOD-sync control symbol is not

supported

Packets can be canceled using stomp, restart-from-retry, or link-request control symbols.

11A ACTION: Device sends packet-retry control symbol for canceled packet (exception: do not send

packet-retry control symbol while already in input retry-stopped or input error-stopped states)

Device encountering a packet retry situation follows the defined retry behavior

12A. DETAIL: Packet retry situation is an internal hazard or a canceled packet (exception: packet

canceled with a link-request control symbol does not follow retry behavior)

12B. ACTION: Moves from the port OK state to the input retry-stopped state upon detection of a

packet retry situation

12C. ACTION: Sends a packet-retry control symbol with the expected ackID value

12D. DETAIL: Device silently discards packets while in the input retry-stopped state

12E. DETAIL: Device detects control symbol errors while in input retry-stopped state

12F. ACTION: Moves from the input retry-stopped state to the port OK state upon reception of a

restart-from-retry or a restart-from-error (link-request/input-status) control symbol

Accepting an input packet of a priority is not contingent on successfully transmitting a packet of a

less than or equal priority

A generated packet-not-accepted control symbol uses a defined cause field encoding.

Table 17-90. General Device 8/16 LP-LVDS Physical Layer Packet

Reception List (continued)

Item No.

Item Functionality

Meets Reqs?

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