PEB2256HT datasheet(196/490 Pages) INFINEON

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FALC56 V1.2

PEB 2256

Operational Description T1/J1

Data Sheet

196

2002-08-27

T1/J1 Initialization

For a correct start up of the primary access interface a set of parameters specific to the

system and hardware environment must be programmed after RES goes inactive (high).

Both the basic and the operational parameters must be programmed before the

activation procedure of the PCM line starts. Such procedures are specified in ITU-T

recommendations (e.g. fault conditions and consequent actions). Setting optional

parameters primarily makes sense when basic operation via the PCM line is guaranteed.

Table 53 gives an overview of the most important parameters in terms of signals and

control bits which are to be programmed in one of the above steps. The sequence is

recommended but not mandatory. Accordingly, parameters for the basic and operational

set up, for example, can be programmed simultaneously. The bit FMR1.PMOD must

always be kept high (otherwise E1 mode is selected). J1 mode is selected by additionally

setting RC0.SJR = 1.

Features like channel loop-back, idle channel activation, clear channel activation,

extensions for signaling support, alarm simulation, etc. are activated later. Transmission

of alarms (e.g. AIS, remote alarm) and control of synchronization in connection with

consequent actions to remote end and internal system depend on the activation

procedure selected.

MODE

MODE2

MODE3

Signaling controller disabled

RAH(2:1)

RAL(2:1)

H, FFH

Compare register for receive address cleared

GCM(6:1)

all 00

Fixed clock mode selected (1.544 MHz on pin MCLK

required).

RTR(4:1)

TTR(4:1)

TSS2

TSS3

all 00

No time slots selected

Table 52

Initial Values after reset and FMR1.PMOD = 1 (T1/J1) (cont’d)

Initiated

Value

Meaning

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