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Daisy Chaining four ADS8568

Naser S.
Genius 11605 points

Other Parts Discussed in Thread: ADS8568, ADCPRO

Customer is planning on daisy chaining four ADS8568 as shown in the  data sheet with the single SDI and the four parallel SDOs.  They have noticed that a number of people have had issues bringing up this configuration on the online forums when interfacing to a FPGA like they are  planning to do.   

 Does TI have an ADCPro driver configuration to work with four development boards chained together?  Any suggestion to hook up these four boards?

 Does TI have example FPGA firmware that customer can reference that would use this daisy chain configuration?  VHDL is preferred, but Verilog is acceptable.  An AXI4 interface would be nice. Thanks. 

 

  • 0
    TI__Intellectual 1205 points
    We do not currently have FPGA firmware for the ADS8568's interface. For implementing the serial interface on all four SDO's in a 4-unit daisy chain configuration, I would recommend writing the interface in several stages. For example, get the interface working for one unit on one SDO, then modify the code to use all four SDO's on one unit, then modify the code to use all four. To make troubleshooting easier, you might also start with a much lower clock frequency to get the timing sequences right, before trying to run at full speed.