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
45
Pin Name
Type
Pin
No.
Function
be accompanied by appropriate adjustments in the TPL
signal.
In Telecom Bus mode:
This signal identifies tributary payload frame boundaries
on the transmit parallel data bus. TV5 is set high to
mark the V5 bytes on the bus.
TV5 is updated on the rising edge of SYSCLK.
TTPL
Output
A19
Transmit Tributary Payload (TTPL).
This signal
indicates valid tributary payload data when configured
for transmit byte wide telecom bus interface.
TTPL is set high during valid VC11 and VC12 bytes.
TTPL is set low for all transport overhead bytes, high
order path overhead bytes, fixes stuff column bytes and
tributary transport overhead bytes (V1,V2,V3,V4).
TTPL is held low in SBI336 mode.
TTPL is updated on the rising edge of SYSCLK.
TTAIS
Output
A18
Transmit Tributary AIS Indicator (TAIS).
This signal
indicates tributaries in low order path AIS state when
configured for the transmit byte wide Telecom Bus
interface.
TTAIS is set high when the tributary on the transmit bus
is in AIS state and is set low when the tributary is out of
AIS state.
TTAIS is held low in SBI336 mode
TTAIS is updated on the rising edge of SYSCLK.
TJUST_REQ
Output
D22
Transmit Justification Request (TJUST_REQ).
This
is the transmit side justification request when configured
for SBI336 byte wide interface instead of the Serial
SBI336S interface and when connecting to a link layer
device. This signal is held low when connecting to a
SBI336 physical layer device or when in telecom bus
mode.
The SBI336 Bus Justification Request signal,
TJUST_REQ, is used to speed up, slow down or
maintain the minimal rate of a slave timed SBI336
device.
This active high signal indicates negative timing
adjustments on the SBI336 bus when asserted high
during the V3 or H3 octet, depending on the tributary
type. In response to this the slave timed SBI336 device
should send an extra byte in the V3 or H3 octet of the
next receive frame along with a valid payload signal
indicating a negative justification.
This signal indicates positive timing adjustments on the
SBI336 bus when asserted high during the octet
following the V3 or H3 octet, depending on the tributary
type. The slave timed SBI336 device should respond to
this by not sending an octet during the V3 or H3 octet of
the next receive frame along with a valid payload signal
indicating a positive justification.
For fractional rate links this signal is asserted high