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
34
Pin Name
Type
Pin
No.
Function
slave timed SBI336 device that the timing master
device is able to accept another byte of data. For every
byte that this signal is asserted high the slave device is
expected to send a valid byte of data.
All timing adjustments from the slave timed device in
response to the justification request must still set the
payload and payload indicators appropriately for timing
adjustments.
RJUST_REQ is sampled on the rising edge of
SYSCLK.
RJUST_REQ has an integral pull-up resistor.
Outgoing SBI Bus (68 Signals)
OC1FP[4]
OC1FP[3]
OC1FP[2]
OC1FP[1]
Output
AF23
W3
M3
C12
Outgoing C1 Frame Pulse (OC1FP[4:1]).
This signal
indicates the first C1 octet on the outgoing SBI or
Telecom bus.
In SBI/SBI336 mode:
This signal also indicates multi-frame alignment which
occurs every 4 frames, therefore this signal is pulsed
every fourth C1 octet to produce a 2KHz multi-frame
signal.
When using the SBI bus in synchronous mode the
OC1FP signal indicates T1 and E1 signaling multi-
frame alignment by pulsing on 48 SBI frame
boundaries. This must be done if CAS is to be switched
along with the data.
For both 19.44Mhz SBI and 77.76MHz SBI336 buses,
only OC1FP[1] will indicate the C1 byte position and
OC1FP[4:2] are held low.
In Telecom Bus mode:
This signal may also be pulsed to indicate the J1 byte
position and the byte following J1. For locked
STS/AUs, the J1 byte position is locked to an offset of
either 0 or 522. The byte following J1 is used to
indicate multi-frame alignment and is only pulsed once
every 4 frames marking the frame with the V1s.
For a 77.76MHz Telecom bus, only OC1FP[1] is used
and OC1FP[4:2] are held low. For a 19.44MHz
Telecom bus, OC1FP[4:1] are all generated with the
same C1 frame alignment.
OC1FP[4:1] is updated on the rising edge of SREFCLK.
ODATA[4][7]
ODATA[4][6]
ODATA[4][5]
ODATA[4][4]
ODATA[4][3]
ODATA[4][2]
ODATA[4][1]
ODATA[4][0]
ODATA[3][7]
ODATA[3][6]
ODATA[3][5]
Tristate
Output
AD18
AC17
AF19
AE18
AF18
AC16
AE17
AD16
T4
U2
T3
Outgoing Data (ODATA[4:1][7:0]).
The Outgoing Data
buses, ODATA[4:1][7:0], are separate time division
multiplexed buses which transport tributaries by
assigning them to fixed octets within the SBI or
Telecom Bus structure.
In 19.44MHz SBI mode, the SBS can drive this bus at
uniquely assigned tributary columns within the SBI bus
structure.
ODATA[1][7:0] can be either a 19.44MHz SBI or
Telecom Bus when combined with ODATA[4:2][7:0] or
can be used as a standalone 77.76MHz SBI336 or