PM7345 datasheet(32/306 Pages) PMC

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PM7345 S/UNI-PDH

DATA SHEET

PMC-931011

ISSUE 6

SATURN USER-NETWORK INTERFACE

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

RNEG/

ROHM

Input

Receive Negative Pulse (RNEG). RNEG contains

the negative pulses received on the B3ZS encoded

DS3, or the HDB3-encoded E3, transmission

system when the dual-rail NRZ input format is

selected. RNEG contains line code violation

indications when the single-rail (unipolar) NRZ input

format is enabled. Each line code violation is

represented by an RCLK period-wide pulse. The

dual-rail/single-rail selection is controlled by the UNI

bit in the DS3 FRMR or E3 FRMR Configuration

Registers.

Receive Overhead Mask (ROHM). ROHM

indicates the position of overhead bits in the non-

DS3/E3 based transmission system stream, RDAT.

When a PLCP formatted signal is received, ROHM

is pulsed once per transmission frame, and

indicates the DS1 or E1 frame alignment. When a

non-PLCP based signal is received, ROHM

indicates the position of each overhead bit in the

transmission frame.

The RNEG/ROHM pin function selection is

controlled by the FRMRBP bit in the S/UNI-PDH

Configuration Register. Both RNEG and ROHM are

sampled on the rising edge of RCLK by default, and

may be enabled to be sampled on the falling edge

of RCLK. This sampling is controlled by the

RCLKINV bit in the S/UNI-PDH Control Register. In

addition, signal polarity control is provided by the

RPNINV bit in the S/UNI-PDH Control Register.

ROHCLK

Output

Receive DS3/E3 Overhead Clock (ROHCLK).

ROHCLK is active when a DS3 or E3 stream is

being processed. ROHCLK is nominally a 526 kHz

clock when processing DS3, is nominally a 1.072

MHz clock when processing G.832 E3, and is

nominally a 1.074 MHz clock when processing

G.751 E3. ROH, and ROHFP are updated on the

falling edge of ROHCLK.

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