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Visitor
Visitor
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Registered: ‎12-09-2018

Supporting many IRQs from PL to PS on ZCU102

Hello,

We need to add 30 instances of a custom IP into the PL, each of those instances has an IRQ line which needs to be connected to the PS (A53).

Firmware engineer thinks there is a limit of 16 IRQs from PL to PS.

Is that true? How do we overcome this restriction?

The A53 CPUs will be running linux (petalinux if that matters).

The custom IP will have its kernel mode driver in linux.

Thank you!

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Scholar
Scholar
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Registered: ‎02-01-2013

Yes, the PSU supports only 16 direct, distinct interrupts from the PL, in two separate banks.

2018-12-19_11-40-47.jpg

Assuming you don't lie awake at night sweating over interrupt latency, consolidate the PL interrupts using an AXI Interrupt Controller. Then you only need to connect the single interrupt from the interrupt controller to the PSU.

2018-12-19_11-36-46.jpg

-Joe G.

 

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