PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 50

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

Semiconductor Group
Figure 15
In µP mode B channels, D channel, C/I codes and Monitor commands can either be
passed between the U transceiver and IOM
the µP via the PI. Any selection of "passed" or "looped" channels can be programmed
via a control register.
3.2
Mode setting of the PEB/F 2091 V5.3 will be described in several subsections below.
This includes setting basic operation modes (e.g. LT, NT, Repeater), as well as setting
special operating modes, i.e. test modes, DOUT driver modes, IOM
EOC Auto/Transparent and monitor time-out on/off.
Setting operation modes of the PEB/F 2091 V5.3 will be different in stand-alone and in
µP mode. These two cases will be distinguished.
3.2.1
µP Mode
In µP mode a microprocessor interface gives access to the configuration registers. The
basic operating mode is selected via bits STCR:BURST,LT, TS2,TS1,TS0, according to
Table 2, page 51 . The STCR register is described on page 212.
Stand-Alone Mode
In stand-alone mode the operating mode is selected via pin strapping of pins LT, Burst,
TS2, TS1 and TS0 according to Table 2, page 51. 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.
Setting Operating Modes
Basic Operating Mode
IOM -2
Stand-Alone Mode (left) and µP Mode (right)
R
U
50
®
-2 directly, or they can be looped through
IOM -2
R
FSC
PI
Functional Description
®
ITS10193
-2 enable/disable,
U
Data Sheet 01.99
PEB 2091
PEF 2091