PM7375-SC datasheet(106/430 Pages) PMC

106 / 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 CLP bit is the received CLP bit in the associated

cell header.

Status [7:0]

The Status field is used by the LASAR-155 to indicate

the status of the received packet. Below are the Status

field bit definitions. When the bit is logic one, the packet

has experienced the indicated condition.

Status[0] -

cell experienced congestion. Cell received

with PTI value 010 or 011.

Status[1] -

cell received with CLP=1.

Status[2] -

Unused.

Status[3] -

cell CRC-10 error.

Status[4] -

Unused.

Status[5] -

Unused.

Status[6] -

Unused.

Status[7] -

cell CRC-32 error.

RVC[6:0]

The Receive Virtual Connection Code (RVC[6:0]) bits

are used by the LASAR-155 to indicate which VC a

RMD is associated with. The RVC bits are constructed

from N (where N=0,1,2) bits of the Virtual Path Identifier

(VPI) and M (where M=7,6,5) bits of the Virtual Channel

Identifier. Selection of M and N are made using a COPS

Receive Buffer

Size [15:0]

The Receive Buffer Size bits indicate the size in bytes of

the current RMD's data buffer. This field must be

configured by the PCI Host during initialization and must

be large enough to accommodate one cell (i.e. 48 or

more bytes).

Bytes in Buffer [15:0]

The Bytes in Buffer bits indicate the number of bytes

actually used in the current RMD's buffer to store cell

data. For RMDs, this value should be between 1 to 48

bytes.

Data Buffer Start

Address[31:0]

The Data Buffer Start Address bits are used as a pointer

to the buffer of the current RMD into PCI Host memory.

Note, Receive Buffers must be DWORD aligned. For

example, Data Buffer Start Address[1:0] is expected to

be set to 00 binary.

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