PEB2256HT datasheet(190/490 Pages) INFINEON

190 / 490 page

FALC56 V1.2

PEB 2256

Operational Description E1

Data Sheet

190

2002-08-27

E1 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 reset goes inactive. 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 and ETSI

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

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

Table 47 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 should

always be kept low (otherwise T1/J1 mode is selected).

RAH(2:1)

RAL(2:1)

H, FFH

Compare register for receive address cleared

GCM(6:1)

all 00

Fixed clock mode selected (2.048 MHz on pin MCLK

required).

Table 47

Initialization Parameters (E1)

Basic Set Up

Master clocking mode

GCM(6:1) according to external MCLK

clock frequency

E1 mode select

FMR1.PMOD = 0

Specification of line interface and clock

generation

LIM0, LIM1, XPM(2:0)

Line interface coding

FMR0.XC(1:0), FMR0.RC(1:0)

Loss-of-signal detection/recovery

conditions

PCD, PCR, LIM1, LIM2

System clocking and data rate

SIC1.SSCC(1:0),

SIC1.SSD1,FMR1.SSD0

CMR2.IRSP/IRSC/IXSP/IXSC

Transmit offset counters

XC0.XCO, XC1.XTO

Receive offset counters

RC0.RCO, RC1.RTO

AIS to system interface

FMR2.DAIS/SAIS

Table 46

Initial Values after Reset (E1) (cont’d)

Reset Value

Meaning

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