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
44
Pin Name
Type
Pin
No.
D19
C20
B21
D20
B22
D21
B23
Function
TDATA[6]
TDATA[5]
TDATA[4]
TDATA[3]
TDATA[2]
TDATA[1]
TDATA[0]
bus when configured for the Transmit byte wide
interface. The transmit data bus is a time division
multiplexed bus which transports tributaries by
assigning them to fixed octets within the 77.76MHz
SBI336 or Telecom Bus structure.
TDATA[7:0] is updated on the rising edge of SYSCLK.
TDP
Output
C18
Transmit Data Parity (TDP).
This is the transmit data
bus parity when configured for the Transmit byte wide
interface. This signal carries the even or odd parity for
the transmit bus signals. In SBI336 mode, the parity
calculation encompasses the TDATA[7:0], TPL and TV5
signals. In Telecom Bus mode, the parity calculation
encompasses the TDATA[7:0] and optionally the
TC1FP and TPL signals.
TDP is updated on the rising edge of SYSCLK.
TPL
Output
D17
Transmit Payload (TPL).
The transmit SBI336 data
bus payload signal indicates valid tributary payload data
when configured for the transmit SBI336 byte wide
interface. In telecom bus mode this signal indicates
valid path payload.
In SBI336 mode:
This active high signal indicates valid data within the
SBI336 structure. This signal is high 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 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
SBI336 structure. For fractional rate links this signal
indicates that the current octet is carrying valid data
when high.
In Telecom Bus mode:
This signal distinguishes between transport overhead
bytes and synchronous payload bytes. TPL is set high
to mark each payload byte on TDATA[7:0] and is set
low to mark each transport overhead byte on
TDATA[7:0].
TPL is updated on the rising edge of SYSCLK.
TV5
Output
C17
Transmit Payload Indicator (TV5).
The transmit
payload indicator (TV5) locates the floating payload on
the SBI336 or Telecom bus when configured for the
transmit byte wide interface.
In SBI336 mode:
This active high signal locates the position of the
floating payloads for each tributary within the SBI336
structure. Timing differences between the port timing
and the SBI336 bus timing are indicated by adjustments
of this payload indicator relative to the fixed SBI336
structure. All movements indicated by this signal must