PM7375-SC datasheet(130/430 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

114

10.1.7

Status

Bit

Type

Function

Default

Bit 15

TBUS[2]

Bit 14

TBUS[1]

Bit 13

TBUS[0]

Bit 12

TDOOLV

Bit 11

Unused

Bit 10

Unused

Bit 9

Unused

Bit 8

Unused

Bit 7

Unused

Bit 6

Unused

Bit 5

Unused

Bit 4

Unused

Bit 3

TROOLV

Bit 2

Unused

Bit 1

Unused

Bit 0

R/W

TREFSEL

This register controls the clock synthesis and reports the state of the transmit phase

locked loop.

TREFSEL:

The transmit reference select (TREFSEL) bit determines the expected frequency

of TRCLK+/-. If TREFSEL is a logic 0, the correct line clock frequency is

synthesized if the reference frequency is 19.44 MHz. If TREFSEL is a logic 1,

the reference frequency must be 6.48 MHz. TREFSEL only has effect if the

TBYP bit in the LASAR-155 Master Configuration register is low.

TROOLV:

The transmit reference out of lock status indicates the clock synthesis phase

locked loop is unable to lock to the reference on TRCLK+/-. TROOLV is a logic

one if the divided down synthesized clock frequency not within 488 ppm of the

TRCLK+/- frequency.

TBUS[2:0], TDOOLV:

The TBUS[2:0] and TDOOLV bits are provided for analog production test and

should be ignored.

PM7375-SC Datasheet(PDF) 130 Page - PMC-Sierra, Inc

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