PM7346 datasheet(53/419 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 32

Pin Name

Type

Pin No.

Function

TGAPCLK[4]

TGAPCLK[3]

TGAPCLK[2]

TGAPCLK[1]

Output

W14

Y10

Framer Gapped Transmit Clock

(TGAPCLK[4:1]). TGAPCLK[4:1] is valid

when the S/UNI-QJET is configured as a

DS3, E3, or J2 framer for non-ATM

applications by setting the FRMRONLY bit

in the S/UNI-QJET Configuration 1

Registers and the TXGAPEN bit in the

S/UNI-QJET Configuration 2 Registers.

TGAPCLK[4:1] is derived from the transmit

reference clock TICLK[4:1] or from the

receive clock if loop-timed. The overhead

bit (gapped) positions are generated

internal to the device. TGAPCLK[4:1] is

held high during the overhead bit

positions. This clock is useful for

interfacing to devices which source

payload data only. TGAPCLK[4:1] is used

to sample TDATI[4:1].

TCELL[4]

TCELL[3]

TCELL[2]

TCELL[1]

Transmit Cell Indication (TCELL[4:1]).

TCELL[x] is valid when the TCELL bit in

the S/UNI-QJET Misc. register (09BH,

19BH, 29BH, 39BH) is set. TCELL[x]

pulses once for every cell (idle or

assigned) transmitted. TCELL[x] is

updated using timing derived from the

transmit input clock (TICLK[x]), and is

active for a minimum of 8 TICLK[x] periods

(or 8 RCLK[x] periods if loop-timed).

PM7346 Datasheet(PDF) 53 Page - PMC-Sierra, Inc

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