PM7341 datasheet(60/413 Pages) PMC

60 / 413 page

PRELIMINARY

INVERSE MULTIPLEXING OVER ATM

PM7341 S/UNI-IMA-84

DATASHEET

PMC-2000223

ISSUE 4

INVERSE MULTIPLEXING OVER ATM

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

Pin Name

Type

No.

Function

DV5

Input

The Active High Drop Bus Payload Indicator

(DV5) is an active high signal that locates the

position of the floating payloads for each tributary

within the SBI BUS structure. Timing differences

between the port timing and the SBI BUS timing are

indicated by adjustments of this payload pointer

relative to the fixed SBI BUS structure.

Multiple PHY-devices can drive this signal at

uniquely assigned tributary columns within the SBI

BUS structure. All movements indicated by this

signal must be accompanied by appropriate

adjustments in the DPL signal.

The DV5 input signal is sampled on the rising edge

of REFCLK.

AC1FP

Input

The Active High Add Bus C1 Frame Pulse (C1FP)

signal is externally generated to indicate the first C1

octet of each four-frame SBI multiframe on the Add

bus.

This frame pulse is a single REFCLK cycle long and

is sampled on the rising edge of REFCLK.

This signal should be pulsed once every fourth C1

octet to produce a 2 KHz multiframe signal. The

frame pulse does not need to be repeated every

fourth SBI frame. The S/UNI-IMA-84 will synchronize

to this signal and flywheel in its absence.

ADATA[7]

ADATA[6]

ADATA[5]

ADATA[4]

ADATA[3]

ADATA[2]

ADATA[1]

ADATA[0]

Tristate

Output

The Add Data (ADATA[7:0]) signals are a time

division multiplexed bus which transports tributaries

by assigning them to fixed octets within the SBI BUS

structure.

The S/UNI-IMA-84 drives ADATA[7:0] only at

uniquely assigned tributary columns within the SBI

BUS structure.

The ADATA[7:0] output signals are updated on the

rising edge of REFCLK.

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