PEB2256HT datasheet(77/490 Pages) INFINEON

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FALC56 V1.2

PEB 2256

Functional Description E1

Data Sheet

2002-08-27

Because the CAS controller is working on the PCM highway side of the receive buffer,

slips disturb the CAS data.

Figure 21

2.048 MHz Receive Signaling Highway (E1)

4.1.14.5

Channel Associated Signaling CAS (E1, µP access mode)

The signaling information is carried in time slot 16 (TS16). Receive data is stored in

registers RS(16:1) aligned to the CAS multiframe boundary. The signaling controller

samples the bit stream either on the receive line side or if external signaling is enabled

on the receive system side.

The signaling procedure is done as it is described in ITU-T G.704 and G.732.

The main functions are:

• Synchronization to a CAS multiframe

• Detection of AIS and remote alarm in CAS multiframes

• Separation of CAS service bits X1 to X3

• Storing of received signaling data in registers RS(16:1) with last look capability

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

(FRS0.LOS = 1), or a loss of CAS multiframe alignment (FRS1.TSL16LFA = 1) or a

receive slip occurs. The current freeze status is output on port FREEZE (RP(A:D)) and

indicated by register SIS.SFS. Optionally automatic freeze signaling can be disabled by

setting bit SIC3.DAF. If SIS.SFS is active, updating of the registers RS(16:1) is disabled.

To relieve the µP load from always reading the complete RS(16:1) buffer every 2 ms the

FALC56 notifies the µP through interrupt ISR0.CASC only when signaling changes from

F0133

A B C D

4 5 6 7

0 1 2 3 4 5 6 7

TS31

TS0

TS1

0 0 0 0 X Y X X

0 1 2 3 4 5 6 7

TS16

A B C D

0 1 2 3 4 5 6 7

TS31

RSIG

RDO

SCLKR

FAS/NFAS

SYPR

125 µs

= Time slot offset (RC0, RC1)

FAS

= Frame alignment signal

NFAS

= TS0 not containing FAS

ABCD

= Signaling bits for time slots 1...15 and 17...31 of CAS multiframe

0000XYXX

= CAS multiframe alignment signal in TS16

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