MPC8540 datasheet(1017/1302 Pages) FREESCALE

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RapidIO Functionality

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

Freescale Semiconductor

17-93

Table 17-88 lists requirements for link maintenance functionality and the compliance of the

RapidIO controller.

Table 17-89 lists requirements for the device while transmitting a packet (a general device is

required to generate response packets) and the compliance of the RapidIO controller.

Table 17-88. General Device 8/16 LP-LVDS Physical Layer Link Maintenance List

Item No.

Item Functionality

Meets Reqs?

Link-request/input-status control symbol causes a link-response control symbol

Link-response control symbol link_status field indicates input port status

2A. DETAIL: Uninitialized means disabled

2B. DETAIL: Initializing means following the training sequence.

2C. DETAIL: Error means unrecoverable problem encountered; no packets are accepted.

2D. DETAIL: Retry-stopped means that input port is stopped due to a retry; no packets are

accepted until receiving a restart-from-retry or a restart-from-error control symbol.

2E. DETAIL: Error-stopped means that input port is stopped due to a transmission error; no

packets are accepted until receiving a restart-from-error control symbol.

2F. DETAIL: Stopped means that input is stopped for some other (not retry or transmission

error) reason; no packets are accepted.

2G. DETAIL: OK means that the input port is operating and can communicate with the

connected device.

Link-request/send-training control symbol causes 256 training patterns to be sent

Link-request/reset control symbol causes the device to reset after four requests

Link-request/input-status, link-response control symbol pair forces completion of all

preceding activity

5A. DETAIL: All preceding packets have generated acknowledge control symbol if

applicable.

5B. DETAIL: Returned link_status correctly indicates next expected ackID

Device does not issue more than one outstanding link-request control symbol (except in case

of time-out)

6A. DETAIL: Device holds off another link-request control symbol until expected

link-response control symbol is received

Table 17-89. General Device 8/16 LP-LVDS Physical Layer Packet

Transmission List

Item No.

Item Functionality

Meets Reqs?

Device cannot issue more than 8 unacknowledged packets

AckIDs are always issued sequentially unless a retry or error causes the device to back up.

Start with ackID = 0 after reset.

Physical layer 3 reserved bits are cleared.

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