VictorMa

May I know Vref working range? From reference manual it is 1.8~5V. My question is, if it is working at 1.8V, what is minimum voltage requirement? 1.7V? We used JTAG-HS3 to programm coolrunner XC2C256-7FT256C with Vref=3.3V before. Now we plan to change Vref to 1.8V. Now sure how reliable this JTAG-HS3 will be working with XC2C256-7FT256C (VCCAUX can be as low as 1.7V). THank you for your support. Victor