PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 55

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

Active means that the behavior is as in former versions of the IEC-Q. The IOM
FSC and DCL are output on the corresponding pins.
Due to the 100 kOhm pull-up resistor this is the default configuration after reset if pin ICE
is not connected.
Table 7
Mode
stand-alone mode
(PMODE= "0" or
unconnected)
µP mode
(PMODE="1")
3.2.5
The U-interface EOC (Embedded Operations Channel) allows transmission of
commands and informations in either direction of the U-interface. For details on EOC
structure and commands, see "Predefined EOC Codes", page 231. If the EOC
"Transparent" mode is selected EOC channel informations will be given transparently on
the IOM
"AUTO" mode an EOC processor is activated for EOC command interpretation and
handling. For operational details of the EOC in both modes see "Access to EOC of
U-Interface", page 110.
In stand-alone mode the EOC mode will be set by the input pin AUTO. In µP mode the
EOC mode will be set by bit AUTO of register STCR (see "STCR-Register", page 212).
3.2.6
The IEC-Q offers an internal reset (monitor procedure "Time-out") for the monitor
procedure (see 3.6.3, page 76 for description of the IOM
Semiconductor Group
®
-2 interface independently of the content of the EOC channel. In the EOC
EOC Auto/Transparent Mode
Monitor Procedure Time-Out (MTO)
Setting IOM
Package
P-LCC-44
M-QFP-64
or
T-QFP-64
P-LCC-44
M-QFP-64
or
T-QFP-64
®
-2 Clock Enable/Disable Mode
ADF2:ICEC bit
polarity
Not available
Not available
"0"
(default)
"1"
"0"
(default)
"1"
55
ICE pin polarity IOM
Not available
"1" or
not connected
"0"
Not available
"1" or
not connected
"0"
"1" or
not connected
"0"
®
-2 Monitor Channel). This reset
Functional Description
interface
Active
Active
Idle
Active
Idle
Active
Idle
Idle
Active
Data Sheet 01.99
®
-2
PEB 2091
PEF 2091
®
-2 clocks