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Altera_Forum's avatar
Altera_Forum
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13 years ago

Can DMA do NOT use a same clock with PCIe IP when using Cyclone IV GX?

If I use a PCIe IP with Qsys,and use DMA mode to transfer video data to our ARM SOC. Can DMA IP use a different clock compard with PCIe IP? If so,When I write,for example,512 bytes to PCIe Tx...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

use dual clock FIFO between DMA-IP annd PCIe-IP.

the FIFO solve timing problem unless receiver's data rate is slower than sender's.

the other question.

when PCIe-IP know the DMA is done?

there should be interrupt signal.

when interrupt becomes high, your BUS-Master ( ARM in this case ) knows it is done.