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
41
Pin Name
Type
Pin
No.
Function
IDP[x] is sampled on the rising edge of SREFCLK.
IDP[4:2] have integral pull-up resistors.
IPL[4]
IPL[3]
IPL[2]
IPL[1]
Input
T25
AF7
AD13
G1
Incoming Bus Payload (IPL[4:1]).
The Incoming
Payload signal, IPL[4:1], 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/SBI336 structure. This
signal goes low during the octet following the V3 or H3
octet within a tributary to accommodate positive timing
adjustments between the tributary rate and the fixed
SBI/SBI336 structure. For fractional rate links this signal
indicates that the current octet is carrying valid data
when high.
Multiple SBI/SBI336 devices can drive this signal at
uniquely assigned tributary columns within the
SBI/SBI336 structure.
For locked TVTs, 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 the synchronous payload bytes. IPL[x] is set
high to mark each payload byte on IDATA[x][7:0] and is
set low to mark each transport overhead byte..
IPL[1] can be part of either a 19.44MHz SBI or Telecom
Bus when combined with IPL[4:2] or can be used as
part of a standalone 77.76MHz SBI336 or Telecom Bus.
IPL[x] is sampled on the rising edge of SREFCLK.
IPL[4:2] have integral pull-up resistors.
IV5[4]
IV5[3]
IV5[2]
IV5[1]
Input
R23
AF8
AE13
G2
Incoming Bus Payload Indicator (IV5[4:1]).
This
signal locates the position of the floating payload for
each tributary within each of the incoming 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
SBI/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 IPL[x] signal.
Multiple SBI/SBI336 devices can drive this signal at
uniquely assigned tributary columns within the
SBI/SBI336 structure.