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LPC 43XX USB DMA Engine Bulk Transfer maximum size ?

Question asked by Kevin King on Feb 2, 2019
Latest reply on Apr 23, 2019 by Kevin King

I have a LPC4357 design with USB0 as the USB host. I'd like to do 65K byte (128 block) BULK reads and writes to the SD cards i have attached. Seems i can get 63 bock size xfers (31K) thru fine - but nothing bigger. Ideally i'd like to get 64 (32K) or 128 (65K) Block read and write transfers to work. Is there a USB0 DMA engine limitation i'm missing ?

The USB0 xfers just don't complete when i tell t to do a 64 or bigger block size to the EHCI controller. 

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