參數(shù)資料
型號: CN8223EPF
英文描述: ATM/SONET TRANSCEIVER|CMOS|QFP|160PIN|PLASTIC
中文描述: 的ATM / SONET的收發(fā)器|的CMOS | QFP封裝| 160PIN |塑料
文件頁數(shù): 140/161頁
文件大?。?/td> 1865K
代理商: CN8223EPF
4.0 Electrical and Mechanical Specifications
CN8223
4.3 Timing
ATM Transmitter/Receiver with UTOPIA Interface
4-6
Conexant
100046D
4.3.2 Line Interface Timing
Tables 4-3
through
4-6
and
Figures 4-2
through
4-5
display the timing
requirements and characteristics of the line interfaces and parallel data and
overhead ports. All times are in nanoseconds. Example LIU circuits are provided
in CN8223 EVM schematics.
Table 4-3. Line Interface Timing
DS1, E1, DS3, E3 External Framers
Name
Interval
Description
Min
Max
ttxcki
1
7
Transmit Clock Period
(1)
22
ttxh
1
4
Transmit Clock Pulse Width High
(2)
8.8
ttsck
3
4
Transmit Sync Setup to Transmit Clock Falling Edge
0
tckts
4
6
Transmit Sync Hold after Transmit Clock Falling Edge
2.4
tckd1
1
2
Transmit Clock Rising Edge to DS1/E1 Serial Data Out
2.9
12.2
tckd2
4
5
Transmit Clock Falling Edge to DS3/E3 Serial Data Out
2.9
10.4
trxcki
8
13
Receive Clock Period
22
trxh
8
11
Receive Clock Pulse Width High
(2)
8.8
15
trsck
9
11
Receive Sync Setup to Receive Clock Falling Edge
0
tckrs
11
12
Receive Sync Hold after Receive Clock Falling Edge
3.4
trdck
10
11
Receive Data Setup to Receive Clock Falling Edge
2.3
tckdr
11
14
Receive Data Hold after Receive Clock Falling Edge
2.6
NOTE(S):
(1)
Nominal clock periods are:
DS1
648 ns
E1
488 ns
E3
29.1 ns
DS3
22.4 ns
(2)
Duty cycle must be 40/60 at maximum input clock rate.
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