I m using EPLD max 7000A series(EPM751AEBI256-7)device . I am programming the device using USB Blaster REV C in Quartus II version 13.0.It shows the following errors.
NOTE: TDI and TMS are pulled up to 3.3V with 2Kohm resistor and TCK is pulldown to ground with 2Kohm resistor.
Error: TDI connection to the first detected device UNKNOWN_E000001 might be shorted to GND.
Error: The TCK and TMS connections to the device before the first detected device UNKNOWN_E000001 might have a problem.
Info: Detected 1 device(s)
In JTAG Debugger also shows TDI is shorted to GND.
Is there any other way to program?
or should I need to use any other Blaster?
In JTAG connector am giving Vref as 5V .But the VCC I/O pins of EPM751AEBI256-7 to 3.3V .Is it correct or not?
Thanks in advance.
Those pullup/pulldowns should be ok.
Are you sure your 10p JTAG connector pins are wired correctly to the MAX devices?
I use a TerAsic USB Blaster clone on a test board I designed with a 10p JTAG connector and EPM7064S-PLCC44 and EPM7128S-PLCC84 devices and have no JTAG issues with QuartusIIweb 13.0sp1.