psf21911 ETC-unknow, psf21911 Datasheet - Page 38

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

Semiconductor Group
setting the SPU bit of the ISAC-S TE or ICC to ’1’. Otherwise, the DU line has to be pulled
to low via an I/O port of the microcontroller
DCL is activated such that its first rising edge occurs with the beginning of the bit
following the C/I0 channel. After the clocks have been enabled this is indicated by the
PU code in the C/I0 channel.
2.3.5
The start of a new superframe on the U-interface may be indicated with a FSC high-
phase lasting for one single DCL-period. A FSC high-phase of two DCL-periods is
transmitted for all other IOM-2 frame starts.
The superframe marker is disabled if pin/bit MS2 = 0.
2.3.6
In µP mode the output type of the IOM dataline DOUT is selectable via bit ADF2:DOD.
In stand-alone mode it is configured via pin DOD. Bit/pin DOD set to 0 selects tristate
(reset value) and DOD set to 1 selects open drain outputs.
In the "open drain" mode pull-up resistors (1 k
and DCL always are push pull.
Superframe Marker
IOM
®
-2 Output Driver Selection
38
– 5 k ) are required on DOUT. FSC
IOM®-2 Interface
PSB 21911
PSF 21911
11.97