PM4328-PI PMC-Sierra, Inc., PM4328-PI Datasheet - Page 57

• Manufacturer Part Number: PM4328-PI
• Description: Framer, T1|E1|T3 Standard Format, 324-BGA
• Manufacturer: PMC-Sierra, Inc.

STANDARD PRODUCT
DATASHEET
PMC-2011596
Pin Name
SAV5
SAJUST_REQ
PROPRIETARY AND CONFIDENTIAL
Type
Input
Output
Tristate
ISSUE 1
Pin
No.
A3
D7
Function
This signal shares a pin with signal ED[12].
System Add Bus Payload Indicator (SAV5). The add
bus payload indicator locates the position of the
floating payloads for each tributary within the SBI bus
structure. Timing differences between the tributary
timing and the synchronous SBI bus are indicated by
adjustments of this payload indicator relative to the
fixed SBI bus structure.
All timing adjustments indicated by this signal must be
accompanied by appropriate adjustments in the SAPL
signal.
The TECT3 only monitors the add bus payload
Indicator signal during the tributary timeslots assigned
to this device.
SAV5 is sampled on the rising edge of SREFCLK.
This signal shares a pin with signal ED[11].
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 TECT3. This is
only used when the TECT3 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.
The TECT3 only drives the justification request signal
during the tributary timeslots assigned to this device.
SAJUST_REQ is updated on the rising edge of
SREFCLK.
44
HIGH DENSITY T1/E1 FRAMER
AND M13 MULTIPLEXER
PM4328 TECT3