PEB2255 datasheet(94/374 Pages) INFINEON

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PEB 2255

FALC-LH V1.3

Functional Description E1

Data Sheet

2000-07

4.5.2

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 in 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 automatically an AIS to the receive

system interface. However, received data can be transparently switched through if bit

FMR2.DAIS is set.

Remote Alarm in

time slot 16 (TS16RA)

Y-bit = 1receivedinCAS

multiframe alignment word

Y-bit = 0receivedinCAS

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 each of two

consecutive CAS multiframes

periods

Transmit Line Short

(XLS)

If XL1 and XL2 are

shortened for at least 32

pulses; pins XL1 and XL2

are forced into a high

impedance state

automatically, if bit

XPM2.DAXLT is reset.

After 32 consecutive pulse

periods the outputs XL1/2 are

activated again and the internal

transmit current limiter is

checked. If a short between XL1/

2 is still existing, the outputs XL1/

2 are switched into high

impedance state again. When the

short disappears pins XL1/2 are

activated automatically.

Transmit Ones Density

(XLO)

32 consecutive zeros in the

transmit data stream on

XL1/2

Cleared with each transmitted

pulse

Table 21

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

Alarm

Detection Condition

Clear Condition

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