PM7346 datasheet(46/419 Pages) PMC

46 / 419 page

PM7346 S/UNI-QJET

DATASHEET

PMC-960835

ISSUE 6

SATURN QUAD USER NETWORK INTERFACE FOR J2, E3, T3

PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND ITS CUSTOMERS’ INTERNAL USE 25

Pin Name

Type

Pin No.

Function

ROHM[4]

ROHM[3]

ROHM[2]

ROHM[1]

Input

Receive Overhead Mask (ROHM[4:1]).

When a DS1 or E1 PLCP or ATM direct-

mapped signal is received, ROHM[4:1] is

pulsed once per transmission frame, and

indicates the DS1 or E1 frame alignment

relative to the RDATI[4:1] data stream.

When an alternate frame-based signal is

received, ROHM[4:1] indicates the position

of each overhead bit in the transmission

frame.

The RNEG/RLCV/ROHM[4:1] pin function

selection is controlled by the RFRM[1:0]

bits in the S/UNI-QJET Receive

Configuration Registers, the UNI bits in the

DS3 FRMR, E3 FRMR, or J2 FRMR

Configuration Registers, and the PLCPEN

and EXT bits in the SPLR Configuration

ROHM[4:1] are sampled on the rising

edge of RCLK[4:1] by default, and may be

enabled to be sampled on the falling edge

of RCLK[4:1]. This sampling is controlled

by the RCLKINV bit in the S/UNI-QJET

Receive Configuration Registers. In

addition, signal polarity control is provided

by the RNEGINV bit in the S/UNI-QJET

Receive Configuration Registers.

RCLK[4]

RCLK[3]

RCLK[2]

RCLK[1]

Input

Receive Clock (RCLK[4:1]). RCLK[4:1]

provides the receive direction timing.

RCLK[4:1] is the externally recovered

transmission system baud rate clock that

samples the RPOS/RDATI[4:1] and

RNEG/RLCV/ROHM[4:1] inputs on its

rising or falling edge.

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