PM7375-SC datasheet(85/430 Pages) PMC

85 / 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

9.14.5 Transmit Descriptor Data Structure

The thirty-two byte Transmit Descriptor Data Structure is used by the PCI Host to

describe a packet or portion of a packet to the PCID's TRM. The data structure and

the fields are described below:

9.14.5.1

Fig. 9.13 Transmit Descriptor

M CE

CT[1:0]

CHS CRC[1:0]

IOC

CLP

Reserved (9)

TVC[6:0]

Packet Length [15:0]

Transmit Buffer Size [15:0]

Data Buffer Start Address [31:0]

Host Next TD Pointer [13:0]

Res (2)

Res

PCID Next TD Pointer [13:0]

Reserved (16)

Reserved (32)

Bit 31

CPAAL5_PDU UU[7:0]

CPAAL5_PDU CPI[7:0]

Unused

30 29 28 27 26

Reserved (6)

Field

Description

The More (M) bit is used by the PCI Host to support

packets that require multiple Transmit Descriptors (TDs).

If M is set to logic one, the LASAR-155 assumes that

the current TD is just one of several TDs for the current

packet. If M is set to logic zero, the LASAR-155

assumes that this TD describes the entire packet for the

single TD packet case or describes the end of a packet

for the multiple TD packet case.

Note, the More bit cannot be set to logic one when the

Chain End bit is set to logic one.

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