PM5366-PI PMC-Sierra, Inc., PM5366-PI Datasheet - Page 62
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PM5366-PI
Manufacturer Part Number
PM5366-PI
Description
HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER AND M13 MULTIPLEXER
Manufacturer
PMC-Sierra, Inc.
Datasheet
1.PM5366-PI.pdf
(267 pages)
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PRELIMINARY
DATASHEET
PMC-2010672
Pin Name
SAJUST_REQ
PROPRIETARY AND CONFIDENTIAL
Type
Output
Tristate
ISSUE 1
Pin
No.
A2
Function
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.
50
HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER
AND M13 MULTIPLEXER
PM5366 TEMAP-84
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