PM7375-SC datasheet(128/430 Pages) PMC

128 / 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

112

LOOPT:

The LOOPT bit selects the source of timing for the transmit section of the

LASAR-155. When LOOPT is a logic zero, the transmitter timing is derived from

inputs TRCLK+ and TRCLK-.

When LOOPT is a logic one, the transmitter timing is derived from the

receiver inputs RXD+ and RXD- when clock recovery is enabled and from

RRCLK+ and RRCLK- when clock recovery is disabled.

DLE:

The DLE bit enables the LASAR-155 diagnostic loopback. When DLE is a logic

one, the transmit stream is connected to the receive stream. Note, whether

loopback is through the CRU or not depends on the RBYP bit in the LASAR-155

Master Configuration register. Simultaneous diagnostic loopback and line

loopback is not supported.

LLE:

The LLE bit enables the LASAR-155 line loopback. When LLE is a logic one,

RXD+ and RXD-, are connected internally to TXD+ and TXD-, respectively.

Simultaneous diagnostic loopback and line loopback is not supported. Polarity

invert (RXDINV) is not supported when line loopback (LLE) is enabled (If LLE = 1

then RXDINV must be set to 0).

FIXPTR:

The FIXPTR bit disables transmit payload pointer adjustments. If the FIXPTR bit

is a logic 1, the transmit payload pointer is set at 522. If FIXPTR is a logic zero,

the payload pointer is controlled by the contents of the TPOP Pointer Control

LCDV:

The LCDV bit reflects the current loss of cell delineation state. LCDV becomes a

logic 1 when an out of cell delineation state has persisted for 4 ms without any

lower level alarms (LOS, LOP, Path AIS, Line AIS) occurring. LCDV becomes

logic 0 when the SYNC state has been maintained for 4 ms.

LCDE:

The LCDE bit enables the loss of cell delineation (LCD) interrupt. When logic

one, the LASAR-155 INTB or PCIINTB output is asserted when there is a

change in the LCD state. When logic zero, the LASAR-155 INTB or PCIINTB

output is not affected by the change in LCD state.

PM7375-SC Datasheet(PDF) 128 Page - PMC-Sierra, Inc