PEB2080 SIEMENS [Siemens Semiconductor Group], PEB2080 Datasheet - Page 47

• Manufacturer Part Number: PEB2080
• Description: S/T Bus Interface Circuit(SBC)
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

LT-S Mode
G1 deactivated
The SBC is not transmitting. No signal detected on the S interface, and no activation command is
received in C/l channel.
G2 synchronized
As a result of an INFO1 detected on the S line or an ARD command, the SBC begins transmitting
INFO2 and waits for reception of INFO3. INFO2 is sent after the awake detector has detected
pulses during 4 ms. The timer to supervise reception of INFO3 is to be implemented in software.
G3 activated
Normal state where INFO4 is transmitted to the S interface. This state is reached less than 2 ms
after an INFO3 first arrives at the SBC receiver. The SBC remains in this state as long as neither a
deactivation or a test mode is requested, nor a reset pulse is issued.
When receiver synchronism is lost, lNFO2 is sent automatically. After reception of INFO3, the
transmitter keeps on sending INFO4. (Version A7 and following)
G4 pend. deact.
This state is triggered by a deactivation request DR. It is an unstable state: indication DIU (state “G4
unackn.”) is issued by the SBC when:
G4 unacknowleded
Final state after a deactivation request. The SBC remains in this state until a response to DIU (in
other words DID) is issued, without which a new activation is impossible.
Test mode continuous pulses
Continuous alternating pulses are sent.
Test mode single pulses
Single alternating pulses are sent (2-kHz repetition rate).
Semiconductor Group
– either INFO0 is received during 16 ms,
– or an internal timer of 32 ms expires.
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Operational Description