PEB2256HT datasheet(91/490 Pages) INFINEON

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FALC56 V1.2

PEB 2256

Functional Description E1

Data Sheet

2002-08-27

4.3.2

Auto Modes

• Automatic remote alarm access

If the receiver has lost its synchronization a remote alarm can be sent automatically,

if enabled by bit FMR2.AXRA to the distant end. The remote alarm bit is set

automatically in the outgoing data stream, if the receiver is in asynchronous state

(FRS0.LFA bit is set). In synchronous state the remote alarm bit is removed.

• Automatic E-bit access

By setting bit XSP.AXS status information of received submultiframes is automatically

inserted at the E-bit position of the outgoing CRC Multiframe without any further

interventions of the microprocessor.

• Automatic AIS to system interface

In asynchronous state the synchronizer enforces an AIS to the receive system

interface

automatically.

However,

received

data

can

switched

through

transparently, if bit FMR2.DAIS is set.

• Automatic clock source switching

In slave mode (LIM0.MAS = 0) the DCO-R synchronizes to the recovered route clock.

In case of loss-of-signal (LOS) the DCO-R switches to Master mode automatically. If

bit CMR1.DCS is set, automatic switching from RCLK to SYNC is disabled.

• Automatic freeze signaling:

Updating of the received signaling information is controlled by the freeze signaling

status. The freeze signaling status is automatically activated if a loss-of-signal or a

Remote Alarm in

time slot 16 (TS16RA)

Y-bit = 1 received in CAS

multiframe alignment word

Y-bit = 0 received in CAS

multiframe alignment word

Loss-of-Signal in

time slot 16

(TS16LOS)

all zeros for at least 16

consecutively received time

slots 16

receiving a one in

time slot 16

Alarm Indication

Signal in time slot 16

(TS16AIS)

time slot 16 containing less

than 4 zeros in each of two

consecutive CAS

multiframes periods

time slot 16 containing more than

3 zeros in one CAS multiframe

Transmit Line Short

(XLS)

more than 3 pulse periods

with highly increased

transmit line current on

XL1/2

transmit line current limiter

inactive

Transmit Ones-

Density

(XLO)

32 consecutive zeros in the

transmit data stream on

XL1/2

Cleared with each transmitted

pulse

Table 20

Summary of Alarm Detection and Release (E1) (cont’d)

Alarm

Detection Condition

Clear Condition

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