CA16B2CNN datasheet(25/30 Pages) AGERE

25 / 30 page

Agere Systems Inc.

Advance Data Sheet

CA16-Type 2.5 Gbits/s DWDM Transponder with

March 2001

16-Channel 155 Mbits/s Multiplexer/Demultiplexer

Figure 12. Frame and Byte Detection

1-1024(F)

Figure 13. OOF Timing (FRAMEN = High)

RECOVERED

CLOCK

OOF

SERIAL

DATA

RXD[15:0]

ROCLK

A1, A1

A2, A2

INVALID DATA

VALID DATA

OOF

BOUNDARY DETECTION ENABLED

Timing Characteristics (continued)

Receiver Framing

Note: Future versions of the cooled transponder

will not support the frame-detect function.

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-

going data bus (RxD[15:0]). Concurrently, the frame

pulse (FP) is set high for one POCLK cycle.

The frame and byte boundary detection block is acti-

vated by the rising edge of OOF and stays active until

the first FP pulse.

Figure 13 shows the frame and byte boundary detec-

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.

1-1023(F)r.3

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