PCIe interrupt

Johannes

Hi,

How can I use the MSI of PCIe in 6678?
Is the interrupt generated when a message is written to a specific address? This way it can be used to trigger a DMA transfer?

Thanks

over 12 years ago

0 Steven Ji over 12 years ago

TI__Genius 12065 points

MSI is basically a memory write to the target PCIe MSI register with MSI vector value.

In C66x device, the PCIe MSI register is MSI_IRQ and MSI vector values could be 0~31.

Please take a look at the previous threads about the MSI discussion, such as

http://e2e.ti.com/support/dsp/c6000_multi-core_dsps/f/639/p/194406/717007.aspx#717007

The PCIe MSI interrupt will trigger event to CorePac. But it is not connected to DMA directly. Please refer to the Interrupt Event table in the data manual to see how the interrupts are mapped to CorePac and EDMA. Hope it helps.

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PCIe interrupt