SBI Bus Serializer ASSP Telecom Standard Product Data Sheet
Released
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2000168, Issue 5
36
Pin Name
Type
Pin
No.
Function
OPL[4]
OPL[3]
OPL[2]
OPL[1]
Tristate
Output
AF22
V2
M4
A12
Outgoing Bus Payload (OPL[4:1]).
The outgoing
payload signal, OPL[x], indicates valid tributary data
within each of the corresponding SBI buses. In
Telecom bus mode, this signal indicates valid path
payload.
In SBI/SBI336 mode:
This active high signal is asserted during all octets
making up a tributary which includes all octets shaded
gray in the framing format tables. This signal goes high
during the V3 or H3 octet within a tributary to
accommodate negative timing adjustments between the
tributary rate and the fixed SBI bus structure. This
signal goes low during the octet after the V3 or H3 octet
within a tributary to accommodate positive timing
adjustments between the tributary rate and the fixed
SBI bus structure. For fractional rate links this signal
indicates that the current octet is carrying valid data
when high.
In 19.44MHz SBI mode, the SBS can drive this signal at
uniquely assigned tributary columns within the SBI bus
structure.
In locked TVT mode, this signal must be driven in the
same manner as for floating TVTs.
In Telecom Bus mode:
This signal distinguishes between transport overhead
bytes and synchronous payload bytes. OPL[x] is set
high to mark each payload byte on ODATA[x][7:0] and
is set low to mark each transport overhead byte.
OPL[1] can be part of either a 19.44MHz SBI or
Telecom Bus when combined with OPL[4:2] or can be
used as part of a standalone 77.76MHz SBI336 or
Telecom Bus.
OPL[4:2] are held tri-state when configured for
77.76MHz operation.
When the SBS is held reset, OPL[4:1] is driven low.
OPL[4:1] is updated on the rising edge of SREFCLK.
OV5[4]
OV5[3]
OV5[2]
OV5[1]
Tristate
Output
AD21
W2
L1
C13
Outgoing Bus Payload Indicator (OV5[4:1]).
The
active high signal, OV5[x], locates the position of the
floating payload for each tributary within each of the
corresponding outgoing SBI/SBI336 or Telecom buses.
In SBI/SBI336 mode:
This active high signal locates the position of the
floating payloads for each tributary within the
SBS/SBI336 structure. Timing differences between the
port timing and the bus timing are indicated by
adjustments of this payload indicator relative to the
fixed bus structure. All movements indicated by this
signal must be accompanied by appropriate
adjustments in the OPL[x] signal.
In 19.44MHz SBI mode, the SBS can drive this signal at
uniquely assigned tributary columns within the SBI bus