1. NS Training Hardware

2. BBUS DMA Controller

3. 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

4. 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