PM7375-SC datasheet(87/430 Pages) PMC

87 / 430 page

PM7375 LASAR-155

DATA SHEET

PMC-931127

ISSUE 6

LOCAL ATM SAR & PHYSICAL LAYER

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

CLP

The Cell Loss Priority (CLP) bit is used by the PCI Host

to control the CLP field in the cell headers used to

transport the current TD's buffer data. Note, this bit is

not considered unless the CHS bit is set to logic one.

When CLP is set to logic one, all cells involved in the

transport of the current buffer will contain a CLP field set

to logic one. If CLP is set to logic zero, all cells involved

in the transmit of the current TD's buffer data will contain

a CLP field set to logic zero. For multiple TD packets,

for all TDs of the packet, the CLP bit must be consistent.

CHS

The Cell Header Select (CHS) bit is used by the PCI

Host to select the source of the cell header fields used

to transport the current TD's buffer data. When CHS is

logic one, the CG, CT[1:0] and CLP bits in the current

TD are used to form the Payload Type Indicator (PTI)

field and the Cell Loss Priority (CLP) field in the cell

headers. When the CHS is logic zero, the default PTI

and CLP fields programmed into the Connection

Parameter Store (COPS) are used.

Note, if CT[1:0] selects AAL5 user cells (00), then CHS

must be set to logic one.

CRC[1:0]

The CRC select (CRC[1:0]) bits select whether the

CRC-32 polynomial, CRC-10 polynomial or no CRC

should be applied to the packet/cell described in the

current TD.

00 - CRC-32

01 - CRC-10

10 - No CRC

11 - No CRC

For multiple TD packets, for all TDs of the packet, the

CRC bits must be consistent.

PM7375-SC датащи(PDF) 87 Page - PMC-Sierra, Inc