PM7344 datasheet(187/293 Pages) PMC

187 / 293 page

PM7344 S/UNI-MPH

DATA SHEET

PMC-950449

ISSUE 6

MULTI-PHY USER NETWORK INTERFACE

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

171

PDV:

The PDV bit indicates the current state of the pulse density violation detector.

When PDV is a logic 1, a violation of the pulse density rule exists. When

PDV is a logic 0, no violation of the pulse density rule exists. Note: the PDV

indication persists for the duration of the pulse density violation. At its

minimum, PDV may be asserted for only 1 bit time, therefore, reading this bit

may not return a logic 1 even though a pulse density violation has occurred.

When the XPDE is enabled for pulse stuffing, PDV remains logic 0.

PDVI, Z16DI:

The PDVI and Z16DI bits identify the source of a generated interrupt. PDVI is

a logic 1 whenever a change in the pulse density violation indication

generated an interrupt. PDVI is cleared to 0 when this register is read.

Z16DI is a logic 1 whenever 16 consecutive zeros are detected. Z16DI is

cleared to 0 when this register is read. Note that the PDVI and Z16DI

interrupt indications operate regardless of whether the corresponding

interrupt enables are enabled or disabled. When STUFF is set to logic 1, the

PDVI and Z16DI bits are forced to logic 0.

Z16DE:

The Z16DE bit enables an interrupt to be generated on the INTB pin when

16 consecutive zeros are detected in the transmit T1 stream. When Z16DE

is set to logic 1, interrupt generation is enabled. When Z16DE is set to logic

0, interrupt generation is disabled.

PDVE:

The PDVE bit enables an interrupt to be generated on the INTB pin when a

change in the pulse density is detected. When PDVE is set to logic 1, an

interrupt is generated whenever a pulse density violation occurs or when the

pulse density ceases to exist (if STUFE is logic 0). When PDVE is set to

logic 0, interrupt generation by pulse density violations is disabled.

PM7344 Datasheet(PDF) 187 Page - PMC-Sierra, Inc