PM5366 datasheet(62/267 Pages) PMC

62 / 267 page

PRELIMINARY

PM5366 TEMAP-84

DATASHEET

PMC-2010672

ISSUE 1

HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER

AND M13 MULTIPLEXER

PROPRIETARY AND CONFIDENTIAL

Pin Name

Type

No.

Function

SAJUST_REQ

Output

Tristate

System Add Bus Justification Request

(SAJUST_REQ). The justification request signals the

Link Layer device to speed up, slow down or maintain

the rate which it is sending data to the TEMAP-84. This

is only used when the TEMAP-84 is the timing master

for the tributary transmit direction.

This active high signal indicates negative timing

adjustments when asserted high during the V3 or H3

octet of the tributary. In response to this the Link Layer

device sends an extra byte in the V3 or H3 octet of the

next SBI bus multi-frame.

Positive timing adjustments are requested by asserting

justification request high during the octet following the

V3 or H3 octet. The Link Layer device responds to this

request by not sending an octet during the V3 or H3

octet of the next multi-frame.

SAJUST_REQ has a different significance in the

flexible bandwidth mode. In this mode, SAJUST_REQ

is high for one SREFCLK cycle for each byte that can

be accepted. A valid byte on SADATA[7:0] with an

accompanying SAPL assertion is expected in

response.

The TEMAP-84 only drives the justification request

signal during the tributary timeslots assigned to this

device. When operating in 19.44 MHz mode (i.e. S77

low), SAJUST_REQ is aligned by the SAC1FP input.

When operating in 77.76 MHz mode (i.e. S77 high),

SAJUST_REQ’s alignment is relative to the SDC1FP

signal.

SAJUST_REQ is updated on the rising edge of

SREFCLK.

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