psf21911 ETC-unknow, psf21911 Datasheet - Page 81

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

-2
2.6
Important: This chapter applies only in µP mode
In µP mode the microcontroller has access to the IOM-2 channels via the processor
interface (PI) and registers.
Figure 26 Access to IOM-2 Channels (µP mode)
The processor interface can be understood as an intelligent switch between IOM-2 and
the U-transceiver. It handles D, B1, B2, C/I and Monitor-channel data. The data can
either be transferred directly between IOM-2 and the U-transceiver, or be controlled 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-2
For a description of the bits WT, BS and SGL please refer to page 127. The default value
after hardware reset is "0" at all 8 positions.
Semiconductor Group
SWST-Register
WT
to the corresponding data.
to the U-transceiver and vice versa.
Access to IOM-2 Channels
B1
U
B2
IOM -2
D
R
CI
FSC
81
PI
MON
ITS10193
U
BS
Access to IOM-2 Channels
SGL
PSB 21911
PSF 21911
11.97