I'm Makoto Fujimoto.
According to iMX25 Reference Manual,WDOG-output-signal is deasserted after POR-input-signal is asserted.
(Refer to Figure 48-10 "WDOG Time-Out Condition/WDT Bit Is Set")
I want to deassert WDOG-output-signal after the watchdog-timeout occurs.
To do so,iMX25 needs POR-input-signal.
But I want to keep all Powers for iMX25 ON.(Don't want to power off all Powers)
Can I assert POR-input-signal as all Powers ON. (without doing Power-OFF and Power-ON)
And Can I connect WDOG-output-signal to POR-input-signal to deassert WDOG.
Best Regards
Hello,
yes, it is possible to asert POR without power up sequence.
Regards,
Yuri.
Hello,
I understand your answer.
We want to reset i.MX25 and external Flash memory when watchdog-timeout occurs.
At first I connected WDOG signal to Flash memory's reset pin.
But it is necessary for this method to use POR signal to deassert WDOG signal when watchdog-timeout occurs.
So I am seeking another method now.
Can I use VSTBY_ACK-output- signal to reset external Flash memory when watchdog-timeout occurs.
When watchdog-timeout occurs,internal system reset is performed.Then VSTBY_ACK-output- signal goes L-level,I think.
(In this case ,I don't use WDOG signal)
Best Regards,
Hello,
please look at my comments below.
> But it is necessary for this method to use POR signal to deassert
> WDOG signal when watchdog-timeout occurs.
The watchdog event provides WDOG assertion and reset to i.MX25,
so the WDOG should be deasserted. "After a time-out, the WDOG Timer
module asserts the internal system reset signal, wdog_rst, which goes to the System
Reset Controller. There is also a provision for WDOG signal assertion by time-out
counter expiration."
As for VSTBY_ACK - this is output, which toggles at finish of internal system reset.
This signal may be used, if internal reset is what it is required.
Regards,
Yuri.