參數(shù)資料
型號(hào): PSF21911
廠商: SIEMENS A G
元件分類: 數(shù)字傳輸電路
英文描述: ISDN Echocancellation Circuit for Terminal Applications IEC-Q TE
中文描述: DATACOM, ISDN ECHO CANCELLER
文件頁數(shù): 26/164頁
文件大?。?/td> 1401K
代理商: PSF21911
PSB 21911
PSF 21911
Operating Modes
Semiconductor Group
26
11.97
2
Functional Description
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:
Operating Modes
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
).
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
Table 2
Modes of Operation (μP and Stand-Alone Mode)
Mode Selection
Output Pins U
Synchronized
DCL
OUT
Mode
Bit/Pin
MS2
Bit/Pin
MS1
Bit/Pin
MS0
CLS
OUT
Super-
frame-
marker
1)
no
yes
no
no
yes
NT
NT
NT-Auto
TE
TE
reserved
0
1
0
0
1
others
0
0
0
1
1
0
0
1
0
0
512
512
512
1536
1536
7680
2)
7680
2)
7680
2)
7680
2)
7680
2)
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