NS9750 - Training Hardware

BBUS DMA Controller

BBUS DMA 16 channels per DMA controller Provides DMA support for the serial controllers and the IEEE-1284 interface Provides DMA support for the USB Device controller Supports single and burst transfers Supports end-of-packet signaling to close an open buffer Supports fly-by-read transfers to move data from system memory to a peripheral Supports fly-by-write transfers to move data from a peripheral to system memory Per channel interrupts to facilitate processor communications Status feedback communicates error conditions

BBUS DMA Create at least two buffer descriptors in system memory. Initialize the buffer descriptor pointer Specify the transfer mode Enable the desired interrupts Enable the DMA channel Service interrupts when they occur