question : DMA of PCI bridge

[Sauce.Cheng]

excuse me
I hate to bother everyone but I have a question about DMA of PCI bridge

Now I attempt to fetch data from peripheral device to SDRAM, and it has been
successed

but how the DMA controller know the data bandwidth of src and dest.

for example, if i get a 16bits data with a 32bits bus, and other 16bits will
be set high
and data will fetched into cache line of dma, then it will be wrote to
32bits SDRAM.

i guess the data will be wrong, isn't ?

please give me some advices. thank you

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