PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 56

• Manufacturer Part Number: PEF2091
• Description: ICs for Communications(ISDN Echocancellation Circuit)
• Manufacturer: Siemens Semiconductor Group

Semiconductor Group
Table 8
EOC Mode
Transparent
Automatic
function transfers the Monitor Channel into the idle state thereby resolving possible
lock-up situations. It therefore is to be used in all systems where no P is capable of
detecting and solving hang-up situations in the monitor procedure. For a detailed
description of the time-out procedure see "Monitor Procedure Time-Out", page 80.
Note 4:
I
MTO mode will be set by bit MTO of register ADF2 (see "ADF2-Register", page 214).
Table 9
MTO Mode
Time-out Enabled
Time-out Disabled
1) In stand-alone mode the pin MTO can be left unconnected. Due to an internal pull-down the
3.2.7
Note 5:
The default frequency of the IOM
(see Note 7, page 70). In some non standard applications it might be more convenient
to have IOM
mode. In this mode it is possible to change the DCL frequency if the IOM
n stand-alone mode the MTO mode will be set by the input pin MTO. In µP mode the
Monitor Channel time-out feature will be enabled.
The Monitor Channel Time-Out feature is only available after the
complete receive frame structure has been detected on U (see Figure 30,
page 81). I.e. this feature is available if the following signals have been
received:
In LT modes, the signals SN3 or SN3T
In NT modes, the signals SL2, SL3, SL3T
See "U-Interface Signals", page 125 for definition of these signals.
This section applies only if the microprocessor mode and the IOM
Master
Setting IOM
®
-2 bit rate on DCL, instead. The IEC-Q supports this in the microprocessor
Setting MTO Mode
Setting EOC Mode
mode are used (see Note 8, page 70 for definition).
®
-2 Bit Clock Mode
Mode Selection
Stand-Alone Mode / µP Mode
Pin AUTO/Bit STCR:AUTO
0
1
Mode Selection
Stand-Alone Mode / µP Mode
Pin MTO/Bit ADF2:MTO
0
1
®
1)
-2 clock DCL will always be two times the bit frequency
56
Functional Description
Data Sheet 01.99
PEB 2091
PEF 2091
®
-2 master
®
-2