Hi, I have a Microblaze based project that communicates to a 16Bit DAC by means of an SPI interface. I'm using the OPB_SPI interface with a OPB to SPI clock ratio of 16 (the minimum for this property) which works out to be a clock of 3.125 Mhz for a 50Mhz OPB bus. This seems extremely slow considering that the DAC unit can work up to an SPI clock frequency of 30Mhz. Does anyone know why the minimum value for the OPB to SPI clock ratio has to 16 or am I just not configuring it properly.
16 years ago