PM7375 datasheet(89/430 Pages) PMC

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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

Data Buffer Start

Address[31:0]

The Data Buffer Start Address bits are used as a pointer

to the packet buffer of the current TD in PCI Host

memory.

No DWORD alignment is assumed.

Host Next TD Pointer

[13:0]

The Host Next TD Pointer is used to store TDRs which

permits the PCI Host to support linked lists of TDs. As

mentioned above, linked lists are terminated using the

CE bit. Linked lists of TDs are used by the PCI Host to

pass the LASAR-155 multiple TD packets or to pass the

LASAR-155 multiple packets associated with the same

VC.

The V bit is used to indicate that the PCID Next TD

Pointer field is valid. When V is set to logic one the PCID

Next TD Pointer[13:0] field is valid. When V is set to

logic zero, the PCID Next TD Pointer[13:0] field is

invalid. This field is used by the host to rebuild the PCID

packet links in the event of a segmentation failure

condition. This field must be initialized to zero by the

PCI Host.

PCID Next TD

Pointer [13:0]

The PCID Next TD Pointer bits are used to store TDRs

which permits the TRM to create linked lists, of TDs

passed to it via the TDRR Queues. The TDs are linked

with other TDs with the same VC. In the case that the

TRM aborts a packet, the TRM will only place the first

TD of a VC on the TDRF Queue. It is the responsibility

of the PCI Host to follow the PCID and Host links in

order to recover all the buffers.

CPAAL5_PDU

UU[7:0]

The Common Part Convergence Sublayer AAL Type 5

Protocol Data Unit User to User (CPAAL5_PDU UU)

octet is used by the LASAR-155 to insert into the UU

field of the associated CPAAL5_PDU. Insertion can be

enabled or disabled using a register bit. If disabled, the

LASAR-155 inserts 00H into the UU field of the

associated CPAAL5_PDU.

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

CPAAL5_PDU UU field must be consistent. Note, the

CPAAL5_PDU UU field is only used when CT[1:0]

selects AAL5 user cells (00).

PM7375 Datasheet(PDF) 89 Page - PMC-Sierra, Inc

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