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參數(shù)資料
| 型號： | S3033 |
| 廠商： | APPLIEDMICRO INC |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | SONET/SDH/ATM OC-3/12 Transceiver(帶片上高頻鎖相環(huán)的SONET/SDH收發(fā)器（完全集成OC-3/12接口器件）) |
| 中文描述： | TRANSCEIVER, PQFP64 |
| 封裝： | 10 X 10 MM, PLASTIC, QFP-64 |
| 文件頁數(shù)： | 18/20頁 |
| 文件大小： | 154K |
| 代理商： | S3033 |
18
S3033
SONET/SDH/ATM OC-3/OC-12 TRANSCEIVER
April 7, 2000 / Revision D
RECEIVER FRAMING
Figure 11 shows a typical reframe sequence in
which a byte realignment is made. The frame and
byte boundary detection is enabled by the rising
edge of OOF and remains enabled while OOF is
High. Both boundaries are recognized upon receipt
of the third A2 byte which is the first data byte to be
reported with the correct byte alignment on the out-
going data bus (POUT[7:0]). Concurrently, the
Frame Pulse (FP) is set High for one POCLK cycle.
When interfacing with a section terminating device,
the OOF input remains High for one full frame after
the first frame pulse while the section terminating
device verifies internally that the frame and byte
alignment are correct, as shown in Figure 12. Since
at least one framing pattern has been detected since
the rising edge of OOF, boundary detection is dis-
abled when OOF is set Low.
The frame and byte boundary detection block is acti-
vated by the rising edge of OOF, and stays active
until the first FP or until OOF goes Low, whichever
occurs last. Figure 12 shows a typical OOF timing
pattern which occurs when the S3033 is connected
to a down stream section terminating device. OOF
remains High for one full frame after the first FP
pulse. The frame and byte boundary detection block
is active until OOF goes Low.
Figure 13 shows the frame and byte boundary de-
tection activation by a rising edge of OOF, and
deactivated by the first FP.
Figure 11. Frame and Byte Detection
NOTE 1: Range of input to output delay can be 1.5 to 2.5 POCLK cycles
Figure 12. OOF Operation Timing with PM5312
STTX or PM5355 SUNI-622
BOUNDARY DETECTION ENABLED
OOF
FP
OOF
FP
BOUNDARY DETECTION ENABLED
Figure 13. Alternate OOF Timing
A1
A1
A1
A2
A2
A2
A2
A2
Note 1
A1
A1
A1
A2
A2
A2 (28H)
Invalid Data
Valid
Data
RECOVERED
CLOCK/
REFCLK
OOF
RSD
POUT[7:0]
POCLK
FP
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