TC1784
System Control Unit (SCU)
User´s Manual
3-67
V1.1, 2011-05
32-bit SCU, V1.18
3.2.8
De-assertion of a Reset
The reset is de-asserted when all of the following conditions are fulfilled.
•
The reset counter has expired (reached zero)
•
No reset request trigger that is configured to generate the same reset is currently
asserted
3.2.8.1
Example1:
Reset request trigger A is asserted and leads to an Application Reset. If the reset request
trigger is de-asserted before RSTCNTA reached zero the Application Reset is de-
asserted when RSTCNTA reaches zero. If the reset request trigger is de-asserted after
RSTCNTA reached zero the Application Reset is de-asserted when the reset request
trigger is de-asserted.
3.2.8.2
Example2:
Reset request trigger A is asserted and leads to an Application Reset. Reset request
trigger A is de-asserted before RSTCNTA reached zero. Reset request trigger B is
asserted after reset request trigger A but before RSTCNTA reaches zero. Reset request
trigger B is also configured to result in an Application Reset. If the reset request trigger
B is de-asserted before RSTCNTA reached zero the Application Reset is de-asserted
when RSTCNTA reaches zero. If the reset request trigger B is de-asserted after
RSTCNTA reached zero the Application Reset is de-asserted when the reset request
trigger B is de-asserted.
3.2.8.3
Example3:
Reset request trigger A is asserted and leads to a System Reset. Reset request trigger
A is de-asserted before RSTCNTA reached zero. Reset request trigger B is asserted
after reset request trigger A but before RSTCNTA reaches zero. Reset request trigger B
is configured to result in an Application Reset. If the reset request trigger B is de-asserted
before RSTCNTA reached zero the System and Application Resets are de-asserted
when RSTCNTA reaches zero. If the reset request trigger B is de-asserted after
RSTCNTA reached zero the Application Reset is de-asserted when the reset request
trigger B is de-asserted.
3.2.9
Reset Triggers
There are two types of reset triggers for the reset control logic:
•
Triggers that lead to a specific reset
•
Triggers that lead to a configurable reset
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