PEF80902 datasheet(39/83 Pages) INFINEON

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PEF 80902

Functional Description

Data Sheet

2001-11-12

Acknowledge Sent / Receive

After having sent the awake signal, the U-transceiver has received the acknowledge

wake tone. If being awoken the U-transceiver has sent the acknowledge. In both cases

the U-transceiver waits for possible repetition or time-out.

Awake Signal Sent

The NT has sent out the awake signal U1W and waits now for a response. If the LT does

not react in time timer T6 expires and the NT repeats its wake-up call.

Deactivated

Only in “Deactivated” state the device may enter the power-down mode.

Deactivating

State Deactivating assures that the C/I-channel code DC is issued four times before

entering the ’Deactivated’ state.

IOM® Awaked

The U-transceiver is deactivated, but may not enter the power-down mode.

Loss of Framing

This state is entered on loss of framing (LOF). No signal is transmitted on the U-interface.

A receiver-reset is performed by.

Note that there is no return to the ’Transparent’ state that has been possible before in

the former IEC-T based state machine.

Pending Deactivation

The U-transceiver has received U0. The U-transceiver remains at least 0.5ms in this

state before it accepts DI.

SBC Synchronizing

The NT is now synchronized and indicates this by AR/ARL towards the downstream

device. The NT waits for the acknowledge ’AI’ from the downstream device.

Sending Awake-Ack.

On the receipt of the awake signal U2W the U-transceiver responds with the

transmission of U1W.

PEF80902 Datasheet(PDF) 39 Page - Infineon Technologies AG