PM8611-BIAP PMC [PMC-Sierra, Inc], PM8611-BIAP Datasheet - Page 278

• Manufacturer Part Number: PM8611-BIAP
• Manufacturer: PMC [PMC-Sierra, Inc]

14.5
14.6
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2010883, Issue 2
Outgoing 77.76 MHz TelecomBus Functional Timing
Figure 37 shows the timing of the Outgoing TelecomBus stream. Timing is provided by
SREFCLK. SONET/SDH data is carried on the ODATA[7:0] signals. The bytes are arranged in
order of transmission in an STS-12/STM-4 stream. Each transport/section overhead byte is
labeled by Sx,y and type. Payload bytes are labeled by Sx,y and Bn, where ‘n’ is the active offset
of the byte. Within Sx,y, the STS-3/STM-1 number is given by ‘x’ and the column number within
the STS-3/STM-1 is given by ‘y’. The OPL signal is set high to mark payload bytes and is set
low at all other bytes. Similarly, OTPL is set high to mark tributary payload bytes and is set low
at all other bytes. The composite transport frame and payload frame signal, OC1FP (OJ0J1V1), is
set high with OPL set low to mark the J0 byte of a transport frame. OJ0J1V1 is optionally set
high with OPL also set high to mark the J1 byte and the byte following J1 of all the streams
within ODATA[7:0]. Tributary path frame boundaries are marked by a logic high on the OV5
signal. Tributaries in AIS alarm are indicated by the OTAIS signal.
Figure 37 Outgoing 77.76 MHz TelecomBus Functional Timing
Outgoing SBI336 Functional Timing
Figure 38 shows the functional timing for the outgoing 77.76 MHz SBI336 bus configured for
connection to a link layer device. When configured for the SBI336 bus, timing is provided by a
77.76 MHz SREFCLK which is also connected to SYSCLK. When connecting to a link layer
device the justification request signal, JUST_REQ, is output from the SBSLITE and is used to
control the link timing. If the SBSLITE is connected to a physical layer device the JUST_REQ
signal is an input synchronized to IC1FP rather than OC1FP. With the exception of the
JUST_REQ signal, the functional timing of the outgoing SBI336 bus is the same when
connecting to a physical layer device as connecting to a link layer device.
OC1FP (OC1J1V1)
ODATA[7:0]
SREFCLK
OTAIS
OTPL
ODP
OPL
OV5
S4,3
A2
S1,1
J0
S2,1
Z0
S3,1
Z0
S4,1
Z0
S1,2
Z0
S2,2
Z0
S3,2
Z0
S4,2
Z0
S1,3
Z0
S2,3
Z0
S3,3
Z0
S4,3
Z0
B522
S1,1
OPTIONALLY SET FOR
J1 AND V1 POSITIONS
S2,1
B522
B522
S3,1
SBSLITE™ Telecom Standard Product Data Sheet
B522
S4,1
S4,3
H2
S1,1
H3
S2,1
H3
S3,1
H3
S4,1
H3
S1,2
H3
S2,2
H3
S3,2
H3
S4,2
H3
S1,3
H3
S2,3
H3
S3,3
H3
Preliminary
S4,3
H3
S1,1
B0
S2,1
B0
S3,1
B0
277
S4,1
B0
S1,2
B0
S2,2
B0
S3,2
B0