psf21911 ETC-unknow, psf21911 Datasheet - Page 35

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

PSB 21911
PSF 21911
IOM®-2 Interface
®
2.3.3
IOM
-2 Monitor Channel
The Monitor channel protocol is a handshake protocol used for programming and
monitoring devices in Monitor channel "0" or "1". These can include the on-chip U-
transceiver of the IEC-Q TE as well as external devices connected to the IOM-2
interface.
The Monitor channel operates on an asynchronous basis. While data transfers on the
bus take place synchronized to frame sync, the flow of data is controlled by a handshake
procedure. For example: data is placed onto the Monitor channel and the MX bit is
activated. This data will be transmitted repeatedly once per 8-kHz frame until the transfer
is acknowledged via the MR bit.
Monitor Channel 0
Monitor channel 0 is available in both operational modes (NT and TE mode). The U-
transceiver is always controlled and monitored via Monitor channel 0. The Monitor
channel commands and indications of the U-transceiver are listed and explained on
page 51-61.
In stand-alone mode the Monitor channel is controlled by an external device, e.g. the
ICC, 3PAC, IPAC or ISAR.
In µP mode the Monitor channel can either be controlled by an external device or via the
microprocessor interface. For a description on how to access the Monitor 0 channel via
the µP-interface please refer to chapter 2.6.4 on page 84.
Monitor Channel 1
Monitor channel 1 is only available in TE mode (DCL = 1.536 MHz). The channel
consists of six bits in each direction.
In stand-alone mode the Monitor 1 channel is ignored by the U-transceiver.
In µP mode it can be accessed via the microprocessor interface (page 83) to control an
external device (e.g. ARCOFI).
Semiconductor Group
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