
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
64
Pin Name
Type
Pin
No.
Function
AV5
Tristate
Output
L2
The
Active High Add Bus Payload Indicator (AV5)
is an active high signal that locates the position of
the floating payload for each tributary within the add
bus structure.
The S/UNI-IMA-84 drives AV5 only at uniquely
assigned tributary columns within the SBI BUS
structure. All movements indicated by this signal are
accompanied by appropriate adjustments in the APL
signal.
The AV5 output signal is updated on the rising edge
of REFCLK.
AJUST_RE
Q
Input
P1
The
Active High Add Bus Justification Request
(AJUST_REQ)
signal is used to speed up or slow
down the S/UNI-IMA-84 which is sending data to the
PHY (e.g., TEMUX).
This active high signal indicates negative timing
adjustments when asserted high during the V3 or H3
octet, depending on the tributary type. In response to
this, the S/UNI-IMA-84 will send an extra byte in the
V3 or H3 octet of the next frame.
This signal indicates positive timing adjustments
when asserted high during the octet following the V3
or H3 octet, depending on the tributary type. The
S/UNI-IMA-84 will respond to this by not sending an
octet during the V3 or H3 octet of the next frame.
All timing adjustments from the S/UNI-IMA-84 in
response to the justification request will still set the
payload and payload indicators appropriately for
timing adjustments.
The AJUST_REQ input signal is sampled on the
rising edge of REFCLK.