Honored Contributor
Honored ContributorHi,
Sorry for not providing the detail information that i got from Altera....... The following is the statement from Altera.... "There is no problem in using VccTRGT for all USB-Blaster revision. The only concern is for Rev A and Rev B USB-Blaster which when the VccTRGT(pin no. 4) = 2.5V and VccIO = 3.3V then this will damage the USB-Blaster since it couldn't handle the over-voltage stress. " .... Hope i can connect 1. 3.3V to VCC(TRGT) of USB blaster. 2. I can connect FPGA also in 3.3V complaint JTAG chain in the board. But, still i am worried about your response...... " However, JTAG in Cyclone IV devices is designed to operate at 2.5V. So, doing this will result in you over driving the device's JTAG signals. It'll probably work for a while but is clearly not recommended and may well kill your device. " Please clarify.. Regards, Thulasi
