參數(shù)資料
型號: S3037
廠商: Applied Micro Circuits Corp.
英文描述: SONET/SDH/ATM OC-3/12 Transceiver W/CDR(19.44和77.76 MHz兩種頻率可選的SONET/SDH收發(fā)器)
中文描述: 的SONET / SDH / ATM的OC-3/12收發(fā)瓦/的CDR(19.44和77.76兆赫兩種頻率可選的的SONET / SDH收發(fā)器)
文件頁數(shù): 20/23頁
文件大?。?/td> 156K
代理商: S3037
20
S3037
SONET/SDH/ATM OC-3/12 TRANSCEIVER W/CDR
December 10, 1999 / Revision C
RECEIVER FRAMING
Figure 12 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 outgoing data
bus (POUT[7:0]). Concurrently, the frame pulse 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 13. 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 pulse or until OOF goes Low, which-
ever occurs last. Figure 12 shows a typical OOF
timing pattern which occurs when the S3037 is con-
nected 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 14 shows the frame and byte boundary detec-
tion activation by a rising edge of OOF, and
deactivated by the first FP pulse.
Figure 12. Frame and Byte Boundary Detection
1. Range of input to output delay can be 1.5 to 2.5 POCLK cycles.
Figure 13. OOF Operation Timing
BOUNDARY DETECTION ENABLED
OOF
FP
OOF
FP
BOUNDARY DETECTION ENABLED
Figure 14. 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
SERDATI
POUT[7:0]
POCLK
FP
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