I am using an OMAP-L138 C6000 and one of its SPI bus channels.
My questions are mainly concerning with the electrical propagation and routing of the SPI Clock and data signals.
Please answer the questions bearing in mind my application will have up to 50 slaves to this single SPI channel. Likely the PCB will be split into three with flex cables and distance from the OMAP to the end slave should not exceed 3 inches.
Here are my questions:
1) What is the most optimal clock distribution circuitry recommended in order to ensure that the clock has the proper power level and signal integrity at the receiving slave ICs.? Do I need a multiple output clock distribution chip to be able to handle the total number of slaves (~50)?
2) Repeat question #1, but with respect to the SPI data lines -- need I distribute these?
3) Which routing topolog(ies) would be the most optimal to use in my application -- star, daisy chain, etc?
4) Are there any application notes or white papers that I could reference to support this effort?
Thanks in advance for any support!
Regards,
Jeremy