PEB2256HT datasheet(139/490 Pages) INFINEON

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FALC56 V1.2

PEB 2256

Functional Description T1/J1

Data Sheet

139

2002-08-27

5.2

Framer Operating Modes (T1/J1)

5.2.1

General

Activated with bit FMR1.PMOD = 1.

PCM line bit rate

1.544 Mbit/s

Single frame length

193 bit, No. 1…193

Framing frequency

8 kHz

Organization

24 time slots, No. 1…24

with 8 bits each, No. 1…8 and one preceding F-bit

Selection of one of the four permissible framing formats is performed by bits FMR4.FM1/

0. These formats are:

4-frame multiframe

F12

12-frame multiframe (D4)

ESF

Extended Superframe (F24)

F72

72-frame multiframe (SLC96)

The operating mode of the FALC56 is selected by programming the carrier data rate and

characteristics, line code, multiframe structure, and signaling scheme.

The FALC56 implements all of the standard and/or common framing structures PCM24

(T1/J1, 1.544 Mbit/s) carriers. The internal HDLC controller supports all signaling

procedures including signaling frame synchronization/synthesis in all framing formats.

After reset, the FALC56 must be programmed with FMR1.PMOD = 1 to enable the T1/

J1 (PCM24) mode. Switching between the framing formats is done by bit FMR4.FM1

⁄0

for the receiver and for the transmitter.

5.2.2

General Aspects of Synchronization

Synchronization status is reported by bit FRS0.LFA (Loss Of Frame Alignment). Framing

errors (pulse frame and multiframe) are counted by the Framing Error Counter FEC.

Asynchronous state is reached if

2 out of 4 (bit FMR4.SSC1/0 = 00), or

2 out of 5 (bit FMR4.SSC1/0 = 01), or

2 out of 6 (bit FMR4.SSC1/0 = 10), or

4 consecutive multiframe pattern in ESF format are incorrect (bit FMR4.SSC1/0 = 11).

If auto mode is enabled, counting of framing errors is interrupted.

The resynchronization procedure is controlled by either one of the following procedures:

• Automatically (FMR4.AUTO = 1). Additionally, it can be triggered by the user by

setting/resetting one of the bits FMR0.FRS (force resynchronization) or FMR0.EXLS

(external loss of frame).

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