PM7350-PI datasheet(75/241 Pages) PMC

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PM7350 S/UNI-DUPLEX

DATA SHEET

PMC-1980581

ISSUE 5

DUAL SERIAL LINK PHY MULTIPLEXER

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

Byte

Bits

Mnemonic

Description

UPCA

The UPCA bit carries flow control

information for the microprocessor control

channel. If this bit is one, control channel

cells may be transferred.

In the event of an errored header, the

UPCA bit will be assumed to be zero. This

ensures cells are not transmitted for which

there is no buffer space.

5:0

PHYID

The PHY identifier determines to which

PHY a cell is destined in the downstream

direction and from which PHY it came in

the upstream direction. It also indicates

whether the cell is a stuff or control

channel cell. The field is encoded as

follows:

“111111” – Stuff cell provided for cell rate

decoupling. The payload carries no useful

data and the cell shall be discarded.

“111110” – Control channel cell. On the

transmit serial link, PHYID shall equal this

value for all cells inserted via the

Microprocessor Cell Buffer. All cells

received on the serial link with this

encoding will be routed to the local

microprocessor.

“100000” to “111101” – Reserved

“000000” to “011111” – Logical channel

index for the PHY devices.

BOC

The Bit Oriented Code (BOC) bit position

carries a repeating 16 pattern that encodes

one of 63 possible code words used for

remote control and status reporting. Five

codes are predefined to represent a

remote defect, a loopback activate

request, a loopback deactivate request, a

reset activate request and a reset

deactivate request. The remaining codes

are either reserved or user defined. The

receiver ensures the pattern is the same

for 10 (default) or 5 repetitions before

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