Question about AM335x External Interrupt

g.f.

Hi,

I have a question about AM335x interrupt.

I want to interrupt AM335x via XDMA_EVENT_INTR0/1/2 as external interrupt.
In TRM(spruh73i)page.201 "6.1.1.1 Input Selection", it's written as follow:
////////////////////////////////////////////////////////////////////
The INTC supports only level-sensitive incoming interrupt detection.
////////////////////////////////////////////////////////////////////

So, I guess it's not edge-sensitve.
I want to know the active level of XDMA_EVENT_INTR0/1/2.
Is it active high or active low? Is it programmable?
I read the TRM and datasheet, but I can't find the explanation.

best regards,
g.f.

over 11 years ago

0 Biser Gatchev-XID over 11 years ago

TI__Guru**** 393215 points

Hi g.f,

There is indeed no information about the active level. My guess is that it's active high, based on the fact that active low signals are marked with "n" somewhere in the name. If you want edge sensitive interrupts, these can be achieved through the GPIO interrupts, which are fully programmable (active edge/level).

0 Jeff Culverhouse over 11 years ago

TI__Genius 9190 points

Hello g.f.

Are you trying to use this as an interrupt to the ARM or to trigger a DMA event?

0 g.f. over 11 years ago in reply to Jeff Culverhouse

Guru 15520 points

Hi Jeff,

Thank you for the reply.

Actually this question was from our customer.
They are trying to use as interrupt to the ARM.

best regards,
g.f.

0 Jeff Culverhouse over 11 years ago in reply to g.f.

TI__Genius 9190 points

Hello g.f.

If they are using it as an interrupt to the ARM then it will be level sensitive. There is no additional logic between the pin and the interrupt hardware, so it will behave as the interrupt section that you referenced above states.

If they are using it as a trigger event to the DMA then it will be edge triggered at the DMA.

0 g.f. over 11 years ago in reply to Jeff Culverhouse

Guru 15520 points

Hi Jeff,

Thank you for the reply.

I understood that it's level sensitive if I use interrupt.
What I want to know is the acitve level of XDMA_EVENT_INTR0/1/2 as specification of this device.
Is it active high or active low?

best regards,
g.f.

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Question about AM335x External Interrupt