Connecting ADC to FPGA CHIP

[roddyalan]

fpga board with adc chip

Hi,

I have been given a really difficult proj for a newbie. I have to use a FPGA Chip and connect it to 4 comparators in input and 8 MOSFET drivers in output. (Spartan 3E)

(1) I am looking for info on how to read data from the comparator. Can I just connect the comparator output to FPGA and in ISE prog, ask it to read from that pin? The comparator is CMOS/TTL compliant, so I guess we have to use LVCMOS or LVTTL standards

(2) Can I just connect the output in a similar way

Please help
Regards
AR

 

[Marcel Majoor]

(1) Your guess is correct.
You have to check on which bank your inputs will be connected.
Xilinx FPGA's have different banks (a number of I/O grouped together), and each of these banks can be supplied with a different power (for example 2.5V or 3.3V). Depending on the bank-supply, the input has to be set (within the ISE -> Floorplan I/O/PACE) to the correct type (voltage and logic type).
The same applies to the outputs.

(2) If the MOSFET drivers have a logic level input then you should not have any problem (provided that the bank supply is adequate).