unless your SPI peripherals run at incredibly high speeds(more than a few MHz), the trace width and spacing used does not matter much. 8 mils should work well for both spacing and width on data and clock lines.
Its not so much about the data speed or clock speed as it is about the transistor switching speed. The induced noise comes more from switching than from the actual data shifting.
Its not so much about the data speed or clock speed as it is about the transistor switching speed. The induced noise comes more from switching than from the actual data shifting.
