2.3. Connectivity

You normally use the VIC as a standalone interrupt controller. Where required, you can daisy-chain a second VIC.

Note

The interrupt latency increases if you use daisy-chaining. See Daisy-chained interrupts.

The VIC connects to the processor as a standard AHB slave, with the FIQ and IRQ signals connected to the FIQ and IRQ inputs on the processor. The interrupt request lines from the peripheral connect to the VICINTSOURCE inputs of the VIC. To ensure that you can read the vector address register in a single instruction, you must put the VIC in the upper 4K of memory, at 0xFFFFF000. See Vector Address Register.

Note

If the VIC is located at a different address, interrupt latency increases.

The following sections describe the connectivity for the two options:

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