RELEASED
PM7350 S/UNI-DUPLEX
DATA SHEET
PMC-1980581
ISSUE 5
DUAL SERIAL LINK PHY MULTIPLEXER
Byte
2
Bits
6
Mnemonic
UPCA
Description
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.
2
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.
3
7
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
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
63
PMC [ PMC-SIERRA, INC ]
