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Processor Reset
System Considerations
It is important that an external 10 kΩ pull-up resistor is placed on the
pin if it is intended to be used as an input for initiating a run-
RESETOUT
ning reset as shown in
It is also extremely important to ensure that an external device,
such as a micro controller, does not drive this signal during or after
coming out of a power-on or hard-reset.
Figure 23-1
shows the active state of the pin during and after
processor is actively driving this pin as an output. If the system uses an
external host or micro controller to control running reset, ensure that the
external device waits until the processor driver has been internally disabled
(by writing to the
. Connect the
RESET
use an external three-state buffer.
DRIVER
RUNNING RESET
CONTROL
Figure 23-1. RESETOUT Pin Multiplexed with RUNRSTIN
23-6
www.BDTIC.com/ADI
Figure
23-1.
register) before actively driving this signal at
RUNRSTCTL
pin to an open-drain pin on the host side, or
RESETOUT
ADSP-214xx
RESETOUT
PAD
RUNRSTIN
ADSP-214xx SHARC Processor Hardware Reference
. The
RESET
V
DD
10 k:
Ensure that host processor
has an open-drain output
and is not actively driving
this pin during or after RESET
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