psf21911 ETC-unknow, psf21911 Datasheet - Page 26

• Manufacturer Part Number: psf21911
• Description: Isdn Echocancellation Circuit Terminal Applications Iec-q
• Manufacturer: ETC-unknow

Semiconductor Group
2
2.1
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
NT
NT
NT-Auto
TE
TE
reserved
Notes:
1)
2)
1 DCL-period high-phase of FSC at superframe position
2 DCL-periods high-phase of FSC at normal position
CLS-clock signal not available while device is in power-down
Functional Description
Operating Modes
Modes of Operation (µP and Stand-Alone Mode)
Mode Selection
Bit/Pin
MS2
0
1
0
0
1
others
Bit/Pin
MS1
0
0
0
1
1
Bit/Pin
MS0
0
0
1
0
0
26
Output Pins U
Synchronized
DCL
OUT
512
512
512
1536
1536
CLS
OUT
7680
7680
7680
7680
7680
2)
2)
2)
2)
2)
Operating Modes
Super-
frame-
marker
no
yes
no
no
yes
PSB 21911
PSF 21911
1)
11.97