PM7347 datasheet(295/341 Pages) PMC

295 / 341 page

S/UNI®-JET Data Sheet

Released

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

295

Document ID: PMC-1990267, Issue 3

Functional Timing

All functional timing diagrams assume that polarity control is not being applied to input and

output data and clock lines (i.e. polarity control bits in the S/UNI-JET registers are set to their

default states).

Figure 29 Receive DS1 Stream

RCLK

RDATI

F BIT

ROHM

INFO 4

INFO 192

F BIT

INFO 1

INFO 2

INFO 3

INFO 4

INFO 5

INFO 3

INFO 1

INFO 2

The Receive DS1 Stream diagram (Figure 29) shows the expected DS1 overhead indicators on

ROHM when the S/UNI-JET is configured for DS1 PLCP or DS1 direct-mapped frame formats.

Frame pulses on ROHM are not required to be present. Once internally synchronized by a pulse

on ROHM, the S/UNI-JET can use its internal timeslot counter for DS1 overhead bit

identification. The ATM cell stream is contained in RDATI, along with a framing bit placeholder

every 193 bit periods. An upstream DS1 framer (such as the PM4341A T1XC or PM4344

TQUAD) must be used to identify the DS1 framing bit position.

Figure 30 Receive E1 Stream

RCLK

RDATI

TS0 bit1

ROHM

TS0 bit5

TS31 bit8 TS0 bit1 TS0 bit2 TS0 bit3

TS0 bit4 TS0 bit5

TS0 bit6

TS0 bit4

TS0 bit2

TS0 bit3

The expected Receive E1 Stream for direct-mapped or PLCP applications is shown in Figure 30.

Frame pulses on ROHM are not required to be present every frame. Once internally synchronized

by a pulse on ROHM, the S/UNI-JET can use its internal timeslot counter for E1 overhead bit

identification. The ATM cell stream is contained in RDATI, along with a framing bit placeholder

every 256 bit periods. An upstream E1 framer (such as the PM6341A E1XC or PM6344 EQUAD)

must be used to identify the E1 framing bit position.

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