PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 97

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

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4.1
Note 27: This chapter applies only in µP mode.
In µP mode the microcontroller has access to the IOM
interface (PI) and registers.
Figure 39
The processor interface can be understood as an intelligent switch between IOM
the transceiver core. It handles D, B1, B2, C/I and Monitor-channel data. The data can
either be transferred directly between IOM
via the PI. The PI acts as an additional participant to the Monitor Channel.
Switching directions are selected by setting the register SWST as indicated below:
• Setting one of the 5 bits B1, B2, D, CI, or MON of SWST to "1" enables the µP access
• Setting the bits listed above to "0" directly passes the corresponding data from IOM
Refer also to "SWST-Register", page 220 for more details. The default value after
hardware reset is "0" at all 8 positions.
Semiconductor Group
SWST-Register
to the corresponding data.
to the transceiver core and vice versa.
WT
Microprocessor Access to
B1
Access to IOM
U
B2
IOM -2
®
D
-2 Channels (µP mode)
R
CI
FSC
®
PI
97
-2 and the transceiver core, or be controlled
IOM
MON
®
-2 Channels
ITS10193
U
®
BS
-2 channels via the processor
Operational Description
SGL
Data Sheet 01.99
PEB 2091
PEF 2091
®
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®
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