PM7346 datasheet(43/419 Pages) PMC

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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 22

Pin Name

Type

Pin No.

Function

TOHM[4]

TOHM[3]

TOHM[2]

TOHM[1]

Output

Transmit Overhead Mask (TOHM[4:1]).

TOHM[4:1] indicates the position of

overhead bits (non-payload bits) in the

transmission system stream aligned with

TDATO[4:1]. TOHM[4:1] 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[4:1] is set to logic 1

once per transmission frame, and

indicates the DS1 or E1 frame alignment.

When a non-PLCP, non-DS3, non-E3, non-

J2 based signal is transmitted, TOHM[4:1]

is a delayed version of the TIOHM[4:1]

input, and indicates the position of each

overhead bit in the transmission frame.

TOHM[4:1] is updated on the falling edge

of TCLK[4:1].

The TNEG/TOHM[4:1] pin function

selection is controlled by the TFRM[1:0]

and the TUNI bits in the S/UNI-QJET

Transmit Configuration Registers. Output

signal polarity control is provided by the

TNEGINV bit in the S/UNI-QJET Transmit

Configuration Registers. Both TNEG[4:1]

and TOHM[4:1] are updated on the falling

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

enabled to be updated on the rising edge

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

by the TCLKINV bit in the S/UNI-QJET

Transmit Configuration Registers. Finally,

both TNEG[4:1] and TOHM[4:1] can be

updated on the rising edge of TICLK[4:1],

enabled by the TICLK bit in the

S/UNI-QJET Transmit Configuration

Registers.

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