PM7347 datasheet(34/341 Pages) PMC

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S/UNI®-JET Data Sheet

Released

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use

Document ID: PMC-1990267, Issue 3

Pin Description

Pin Name

Type

No.

Function

TPOS

TDATO

Output

The Transmit Digital Positive Pulse (TPOS) contains the

positive pulses transmitted on the B3ZS-encoded DS3,

HDB3-encoded E3, or B8ZS-encoded J2 transmission

system when the dual-rail output format is selected.

The Transmit Data (TDATO) contains the transmit data

stream when the single-rail (unipolar) output format is

enabled or when a non-DS3/E3/J2 based transmission

system is selected.

The TPOS/TDATO pin function selection is controlled by

the TFRM[1:0] and the TUNI bits in the S/UNI-JET

Transmit Configuration Register. Output signal polarity

control is provided by the TPOSINV bit in the S/UNI-JET

Transmit Configuration Register.

Both TPOS and TDATO are updated on the falling edge

of TCLK by default, and may be configured for update on

the rising edge of TCLK through the TCLKINV bit in the

S/UNI-JET Transmit Configuration Register. Also, both

TPOS and TDATO can be updated on the rising edge of

TICLK, enabled by the TICLK bit in the S/UNI-JET

Transmit Configuration Register.

TNEG

TOHM

Output

The Transmit Digital Negative Pulse (TNEG) contains the

negative pulses transmitted on the B3ZS-encoded DS3,

HDB3-encoded E3, or B8ZS-encoded J2 transmission

system when the dual-rail NRZ output format is selected.

The Transmit Overhead Mask (TOHM) indicates the

position of overhead bits (non-payload bits) in the

transmission system stream aligned with TDATO. TOHM

indicates the location of the M-frame boundary for DS3,

the position of the frame boundary for E3, and the

position of the multi-frame boundary for J2 when the

single-rail (unipolar) NRZ input format is enabled.

When a PLCP formatted signal is transmitted, TOHM is

set to logic one once per transmission frame, and

indicates the DS1 or E1 frame alignment.

When a non-PLCP, non-DS3, non-E3, or non-J2 based

signal is transmitted, TOHM is a delayed version of the

TIOHM input, and indicates the position of each

overhead bit in the transmission frame. TOHM is updated

on the falling edge of TCLK.

The TNEG/TOHM pin function selection is controlled by

the TFRM[1:0] and the TUNI bits in the S/UNI-JET

Transmit Configuration Register. Output signal polarity

control is provided by the TNEGINV bit in the S/UNI-JET

Transmit Configuration Register.

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