参数资料
型号: XRT94L31IB
厂商: Exar Corporation
文件页数: 10/133页
文件大小: 0K
描述: IC MAPPER DS3/E3/STS-1 504TBGA
标准包装: 24
应用: 网络切换
接口: 总线
电源电压: 3.14 V ~ 3.47 V
封装/外壳: 504-LBGA
供应商设备封装: 504-TBGA(35x35)
包装: 托盘
安装类型: 表面贴装
XRT94L31
107
REV. 1.0.1
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC
1.3
STS-3/STM-1 TELECOM BUS INTERFACE TIMING INFORMATION
1.3.1
STS-3/STM-1 Telecom Bus Interface Timing Information
This section presents the timing requirements for the STS-3/STM-1 Telecom Bus Interface. In particular this
section prsents the following.
1.
Identifies which edge of TxA_CLK in which the TxA_D[7:0], TxA_PL, TxA_C1J1, TxA_ALARM and
TxA_DP output pins are updated on.
2.
The clock to output delays (from the rising edge of TxA_CLK to the instant that the TxA_D[7:0], TxA_PL,
TxA_C1J1, TxA_ALARM and TxA_DP output pins are updated.
3.
Identifies which edge of RxD_CLK that the RxD_D[7:0], RxD_PL, RxD_C1J1, RxD_ALARM and
RxD_DP input pins are sampled on.
4.
The set-up time requirements (from an update in the RxD_D[7:0], RxD_PL, RxD_C1J1, RxD_ALARM
and RxD_DP input signals to the rising edge of RxD_CLK).
5.
The hold-time requirements (from the rising edge of RxD_CLK to a change in the RxD_D[7:0], RxD_PL,
RxD_C1J1, RxD_ALARM and RxD_DP input signals)
1.3.1.1
The Transmit STS-3/STM-1 Telecom Bus Interface Timing
In the Transmit STS-3/STM-1 Telecom Bus Interface, all of the signals (which are output via this Bus Interface)
are updated upon the rising edge of TxA_CLK (19.44MHz clock signal).
Figures 12 and 13 presents an illustration of the waveforms of the signals that will be output via the Transmit
STS-3/STM-1 Telecom Bus Interface, as well as the timing parameter (t1).
NOTE: The value for t1 can be found in
The TxSBFP input signal is sampled upon the rising edge of TxA_CLK by the Transmit STS-3/STM-1 Telecom
Bus Interface circuitry, as illustrated below in Figure 13.
FIGURE 12. AN ILLUSTRATION OF THE WAVEFORMS OF THE SIGNALS THAT ARE OUTPUT VIA THE TRANSMIT STS-3/
STM-1 TELECOM BUS INTERFACE.
t1
TxA_CLK
TxA_D[7:0]
TxA_PL
TxA_C1J1
A2
C1
J1
Data
J1
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