PEB2256HT datasheet(101/490 Pages) INFINEON

101 / 490 page

FALC56 V1.2

PEB 2256

Functional Description E1

Data Sheet

101

2002-08-27

4.4.7.4

Channel Associated Signaling CAS (E1, serial mode)

In external signaling mode (serial mode) the signaling data received on port XSIG is

sampled with the working clock of the transmit system interface (SCLKX) in combination

with the transmit synchronization pulse (SYPX). Data on XSIG is latched in the bit

positions 5 to 8 per time slot, bits 1 to 4 are ignored. Time slots 0 and 16 are sampled

completely (bit 1 to 8). The received CAS multiframe is inserted frame aligned into the

data stream on XDI and must be valid during the last frame of a multiframe if CRC4/

multiframe mode is selected. The CAS multiframe is aligned to the CRC4-multiframe;

other frames are ignored. Data sourced by the internal signaling controller (µP access

mode) overwrites the external signaling data.

If the FALC56 is configured for no signaling, the system interface data stream passes

the FALC56 undisturbedly.

Note: CAS data on XSIG is read in the last frame of a multiframe only and ignored in all

other frames.

Figure 26

2.048 MHz Transmit Signaling Highway (E1)

4.4.7.5

Channel Associated Signaling CAS (E1, µP access mode)

Transmit data stored in registers XS(16:1) is transmitted on a multiframe boundary in

time slot 16. The signaling controller inserts the bit stream either on the transmit line side

or, if external signaling is enabled, on the transmit system side using pin function XSIG.

Data sourced by the internal signaling controller overwrites the external signaling data.

If the FALC56 is configured for no signaling, the system interface data stream passes

the FALC56 undisturbedly.

F0132

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

XSIG

XDI

SCLKX

FAS/NFAS

SYPX

125 µs

= Time slot offset (XC0, XC1)

FAS

= Frame alignment signal, is taken from XSIG, not from XDI

NFAS

= TS0 not containing FAS

ABCD

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

0000XYXX

= CAS multiframe alignment signal, has to be provided in TS16

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