PM4318-BI データシートの表示（PDF） - PMC-Sierra

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PM4318-BI

OCTAL E1/T1/J1 LINE INTERFACE DEVICE

PMC-Sierra 

PRELIMINARY

DATASHEET

PMC- 2001578

ISSUE 3

PM4318 OCTLIU

OCTAL E1/T1/J1 LINE INTERFACE DEVICE

Pin Name

Type

Pin Function

No.

Timing Options Control

XCLK

Input

D9

RSYNC/ICLK_OUT

Output D8

Alarm Interface

LOS

Output A5

LOS_L1

Output C7

Crystal Clock Input (XCLK). This signal provides a stable, global

timing reference for the OCTLIU internal circuitry via an internal

clock synthesizer. XCLK is a nominally jitter free clock at

1.544 MHz in T1 mode and 2.048 MHz in E1 mode.

In T1 mode, a 2.048 MHz clock may be used as a reference.

When used in this way, however, the intrinsic jitter specifications

in AT&T TR62411 may not be met.

Recovered Clock Synchronization Signal (RSYNC). This output

signal is the recovered, jitter attenuated, receiver line rate clock

(1.544 or 2.048 MHz) of one of the eight T1 or E1 channels or,

optionally, the recovered, jitter attenuated clock synchronously

divided by 193 (T1 mode) or 256 (E1 mode) to create a 8 kHz

timing reference signal. The default is to source RSYNC from

octant #1.

When the OCTLIU is in a loss of signal state, RSYNC is derived

from the XCLK input or, optionally, is held high.

RSYNC shares the same pin as the ICLK_OUT output. RSYNC is

selected when SBI2CLK is tied low.

Loss of Signal Alarm (LOS). This signal outputs the LOS status

of the 8 LIU octants in a serial format which repeats every 8

XCLK cycles. The presence of the LOS status for LIU #1 on this

output is indicated by the LOS_L1 output pulsing high. On the

following XCLK cycle, the LOS status for LIU #2 is output, then

LIU #3, and so on.

This signal is intended for use in Hardware Only mode. When the

microprocessor interface is enabled, the status of the LOS alarm

can also be determined by reading the LOSV bit in the CDRC

Interrupt Status register.

LOS is updated on the falling edge of XCLK.

Loss of Signal LIU #1 indicator (LOS_L1). This signal is pulsed

high for one XCLK cycle every 8 XCLK cycles and indicates that

the LOS status for LIU #1 is being output on LOS.

LOS_L1 is updated on the falling edge of XCLK.

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

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