PM7367 datasheet(70/323 Pages) PMC

70 / 323 page

PM7367 FREEDM-32P32

DATA SHEET

PMC-1991499

ISSUE 2

FRAME ENGINE AND DATA LINK MANAGER

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

Field

Description

The Chain End (CE) bit is used by the host to indicate

the end of a linked list of TDs presented to the TMAC.

The linked list can contain one or more packets as

delineated by the M bit (see above). When CE is set

to logic 1, the current TD is the last TD of a linked list

of TDs. When CE is set to logic 0, the current TD is

not the last TD of a linked list. When the current TD

is not the last of the linked list, the Host Next TD

Pointer[13:0] field is valid, otherwise the field is not

valid.

Note: When CE is set to logic 1, the only valid value

for M is logic 0.

Note: When presenting raw (i.e. unpacketised) data

for transmission, the host should code the M and CE

bits as for a single packet chain, i.e. M=1, CE=0 for

all TDs except the last in the chain and M=0, CE=1

for the last TD in the chain.

TCC[6:0]

The Transmit Channel Code (TCC[6:0]) field is used

by the host to indicate with which channel a TD is

associated. All TD in a chain must be associated with

the same channel, i.e. have this field set to the same

value.

Legal values for this field are 0 to 31.

TMAC Next TD Pointer

[13:0]

The TMAC Next TD Pointer[13:0] bits are used to

store TDRs which permits the TMAC to create linked

lists of TDs passed to it via the TDRR queue. The

TDs are linked with other TDs belonging to the same

channel and same priority level. In the case that data

presented to the TMAC is returned to the host due to

a channel becoming unprovisioned, a TDR pointing to

the start of the per-channel linked list of TDs is placed

on the TDRF queue. It is the responsibility of the

host to follow the TMAC and host links in order to

recover all the buffers.

ABT

The Abort (ABT) bit is used by the host to abort the

transmission of a packet. When ABT is set to logic 1,

the packet will be aborted after all the data in the

buffer has been transmitted. If ABT is set to logic 1 in

the current TD, the M bit must be set low and the CE

bit must be set to high..

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