PSB21911 데이터 시트보기 (PDF) - Infineon Technologies

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PSB21911

ICs for Communications ISDN Echocancellation Circuit for Terminal Applications IEC-Q TE

Infineon Technologies 

2

Functional Description

PSB 21911

PSF 21911

Operating Modes

2.1

Operating Modes

The default configuration after power-on or external reset depends on the state of the

PMODE pin. The cases µP mode and stand-alone mode have to be distinguished:

µP mode (PMODE = VDD)

In µP mode a microprocessor interface gives access to the IOM-2 channel registers as

well as configuration registers. The operating mode is selected via bits STCR:MS0-MS2

according to table 2 . The STCR register is described on page 119.

Test modes Send Single Pulses, Quiet Mode or Data Through are invoked via the

corresponding C/I channel command (page 75) or via bits STCR:TM1-2 (table 3).

Stand-alone mode (PMODE = GND)

In stand-alone mode the operating mode is selected via pin strapping according to

table 2. It is possible to change the mode of a device during operation (e.g. for test

purposes) if the mode change is followed by a reset.

The test modes Send Single Pulses (SSP), Quiet Mode (QM) and Data Through (DT)

are invoked via the corresponding C/I channel command (page 75) or via pins RES and

TSP (table 3).

Table 2

Mode

Modes of Operation (µP and Stand-Alone Mode)

Mode Selection

Output Pins U

Synchronized

Bit/Pin Bit/Pin Bit/Pin DCL

MS2 MS1 MS0 OUT

CLS

OUT

NT

NT

NT-Auto

TE

TE

reserved

0

0

0

512

76802)

1

0

0

512

76802)

0

0

1

512

76802)

0

1

0

1536

76802)

1

1

0

1536

76802)

others

Super-

frame-

marker1)

no

yes

no

no

yes

Notes: 1) 1 DCL-period high-phase of FSC at superframe position

2 DCL-periods high-phase of FSC at normal position

2) CLS-clock signal not available while device is in power-down

Semiconductor Group

26

11.97

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