Advance Data Sheet
March 2001
CA16-Type 2.5 Gbits/s DWDM Transponder with
16-Channel 155 Mbits/s Multiplexer/Demultiplexer
going data bus (RxD[15:0]). Concurrently, the frame
pulse (FP) is set high for one POCLK cycle.
Timing Characteristics (continued)
Receiver Framing
The frame and byte boundary detection block is acti-
vated by the rising edge of OOF and stays active until
the first FP pulse.
Note: Future versions of the cooled transponder
will not support the frame-detect function.
Figure 13 shows the frame and byte boundary detec-
Figure 12 shows a typical reframe sequence in which a
byte realignment is made. The frame and byte bound-
ary detection is enabled by the rising edge of OOF.
Both the frame and byte boundaries are recognized
upon receipt of the first A2 byte following three consec-
utive A1 bytes. The third A2 byte is the first data byte to
be reported with the correct byte alignment on the out-
tion activation by a rising edge of OOF and deactiva-
tion by the first FP pulse.
Figure 14 shows the frame and byte boundary detec-
tion by the activation of a rising edge of OOF and deac-
tivation by the FRAMEN input.
RECOVERED
CLOCK
OOF
SERIAL
DATA
A1
A1
A1
A2
A2
A2
A2
A2
A2
RXD[15:0]
A1, A1 A1, A1 A1, A1 A2, A2 A2, A2 A2, A2 A2, A2
INVALID DATA VALID DATA
ROCLK
FP
1-1023(F)r.3
Figure 12. Frame and Byte Detection
BOUNDARY DETECTION ENABLED
OOF
FP
SEARCH
1-1024(F)
Figure 13. OOF Timing (FRAMEN = High)
25
Agere Systems Inc.
AGERE [ AGERE SYSTEMS ]
