PM7375-SC datasheet(203/430 Pages) PMC

203 / 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

187

cells are dropped. When PTI_10X_ED is set to logic zero, the cells are copied to

the Multipurpose Port.

CRC-10_DIS:

The CRC-10_DIS bit controls whether to discard or pass ATM cells with CRC-10

error. When CRC-10_DIS is set to logic one, ATM cells with CRC-10 errors are

dropped. When CRC-10_DIS is set to logic zero, the cells are passed.

MRPDU_EN:

The MRPDU_EN bit controls whether to enforce the user programmed maximum

receive CPAAL5_PDU length. If MRPDU_EN is set to logic one, the maximum

length of the CPAAL5_PDU is user programmable using the RALP Max Rx PDU

Length register. CPAAL5_PDUs that exceed this length are prematurely

terminated. All successive bytes from this CPAAL5_PDU are dropped until the

start of the next CPAAL5_PDU.

If MRPDU_EN is set to logic zero, the RALP block will not enforce a

maximum PDU length.

REAS_DM:

The REAS_DM bit selects the reassembly disable mode. Two modes to disable

the RALP block from reassembling CPAAL5_PDUs are provided. When

REAS_DM is set to logic one and the REAS_EN bit is used to disable

reassembling, the RALP block will immediately stop reassembly on all VCs.

When REAS_DM is set to logic zero and the REAS_EN bit is used to

disable reassembling, the RALP block will not start any new reassembles but will

continue to complete the current CPAAL5_PDUs under reassembly. In this

manner, graceful system shutdown can be accomplished. An interrupt is

generated when all of the VCs complete their packet reassemblies.

Note, regardless of the state REAS_DM is set to, management cells (PTI

= 100, 101, 110, 111) are immediately filtered when reassembly is disabled (i.e.

REAS_EN = 0).

PM7375-SC Datasheet(PDF) 203 Page - PMC-Sierra, Inc