PEB 2091
PEF 2091
Functional Description
3.6.4
Activation/Deactivation of IOM®-2 Clocks
Note 18: This section applies only in the NT, NT-Auto Activation, NT-RP and TE
modes.
The IOM®-2 clocks may be switched off if the IEC-Q is in state ’Deactivated’ (see "State
Machine in NT Modes", page 160). This reduces power consumption to a minimum. In
this deactivated state the clock lines are low and the data lines are high. The power-down
condition within the ’Deactivated’ state will only be entered if no Monitor messages are
pending on IOM®-2.
For information on how to keep the IOM®-2 clocks active in all states please refer to the
application note ’Providing Clocks in Deactivated State’.
The deactivation procedure is shown in Figure 31. After detecting the code DI
(Deactivation Indication) the IEC-Q responds by transmitting DC (Deactivation
Confirmation) during subsequent frames and stops the timing signals after the fourth
frame.
a)
IOM R -2 Interface
deactivated
FSC
DI
DI
DI
DI
DI
DI
DIN
DR
DR
DC
DC
DC
DC
DOUT
Detail see Fig.b
b)
IOM R -2 Interface
deactivated
DCL
DIN
D
C / Ι
C / Ι
C / Ι
C / Ι
ITD10292
Figure 31
Deactivation of the IOM®-2 Clocks
The IOM®-2 clocks are activated automatically when one of the following conditions
apply
• the DIN line is pulled low
Semiconductor Group
82
Data Sheet 01.99
INFINEON [ Infineon ]
