psb21391 Infineon Technologies Corporation, psb21391 Datasheet - Page 69

• Manufacturer Part Number: psb21391
• Description: Siemens Codec With Upn Transceiver
• Manufacturer: Infineon Technologies Corporation

2.2.8
The IOM-2 interface can be switched off in the inactive state, reducing power
consumption to a minimum. In this deactivated state is FSC = ’1’, DCL = ’0’ and BCL =
’1’ and the data lines are ’1’. The data between the functional blocks of the SCOUT is
then transferred internally.
The IOM-2 interface can be kept active while the line interface is deactivated by setting
the CFS bit to "0" (MODE register). This is the case after a hardware reset. If the IOM-2
interface should be switched off while the line interface is deactivated, the CFS bit should
be set to ’1’. In this case the internal oscillator is disabled when no signal (info 0) is
present on the line interface and the C/I command is ’1111’ = DIU (refer to chapter
2.3.5.1.3 and 2.3.5.1.6). If the TE wants to activate the line, it has first to activate the
IOM-2 interface either by using the "Software Power Up" function (IOM_CR.SPU bit) or
by setting the CFS bit to "0" again.
The deactivation procedure is shown in figure 35. After detecting the code DI
(Deactivate Indication) the layer 1 of the SCOUT responds by transmitting DC
(Deactivate Confirmation) during subsequent frames and stops the timing signals
synchronously with the end of the last C/I (C/I0) channel bit of the 6th frame.
Figure 35
Deactivation of the IOM
Data Sheet
IOM -2
FSC
DU
DCL
DD
DR
Activation/Deactivation of IOM-2 Interface
DR
DI
DR
DI
DR
®
DI
-Interface
DR
DI
DR
DI
DR
DI
59
DC
DI
DC
DI
DC
DI
B1
DC
DI
D
B2
DC
DI
CIO
D CIO
ITD09655
DC
DI
PSB 21391
PSB 21393
Interfaces
2001-03-07
IOM -2
Deactivated