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参数资料
| 型号： | PEF2080 |
| 厂商： | SIEMENS AG |
| 英文描述： | S/T Bus Interface Circuit(SBC) |
| 中文描述： | S / T的总线接口电路（SBC）的 |
| 文件页数： | 35/74页 |
| 文件大小： | 2620K |
| 代理商： | PEF2080 |
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Semiconductor Group
36
Functional Description
Test Signals
Two kinds of test signals may be sent by the SBC: single pulses and continuous pulses.
The single pulses are of alternating polarity, one S-interface bit period wide, 0.25 ms apart, with a
repetition frequency 2 kHz. Single pulses can be sent in all applications. The corresponding C/l
command in TE, LT-S and LT-T applications is SSZ (Send single zeros). Alternatively, this test
mode can be effected by pulling pin SSZ (pin X2, NT mode only) to logical “0”.
Continuous pulses are likewise of alternating polarity, one S-interface bit period wide, but they are
sent continuously. The repetition frequency is 96 kHz. Continuous pulses may be transmitted in all
applications. This test mode is entered in LT- S, LT-T and TE applications with the C/l command
SCZ. Alternatively, pin SCZ (pin CP, NT mode only) can be pulled to logical “0”.
Special Applications
The mode specific pins X0-3 allow for special applications to be implemented, some of which are
mentioned in the following.
Star Configuration
In NT mode, the SBC transmits the D-bit state over pin X0 (DE). A star configuration may be
implemented by connecting pins X0 of several SBC’s together (open drain with integrated pull up).
With X1 (DEX,
D
-E-
Ex
ternal mirrowing) tied to logical “1”, the SBC transmits the resulting DE (wired
AND for all SBC’s) as the S-interface echo bit.
See figure 18
.
Figure 18
Star Configuration in NT
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PEF2080-N | 制造商:INFINEON 制造商全称:Infineon Technologies AG 功能描述:S/T Bus Interface Circuit(SBC) |
| PEF2091 | 制造商:INFINEON 制造商全称:Infineon Technologies AG 功能描述:ICs for Communications(ISDN Echocancellation Circuit) |
| PEF2091F | 制造商:未知厂家 制造商全称:未知厂家 功能描述:?ISDN Echocancellation Circuit - 2B1Q Code? |
| PEF2091FV5.3 | 制造商:INFINEON 制造商全称:Infineon Technologies AG 功能描述:ICs for Communications(ISDN Echocancellation Circuit) |
| PEF2091HV5.3 | 制造商:INFINEON 制造商全称:Infineon Technologies AG 功能描述:ICs for Communications(ISDN Echocancellation Circuit) |
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