JTAG Detection Problem in MAX7000AE

[Balamurugan_V]

Hello all,

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)

Info:Device1: UNKNOWN_E000001

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.

[Balamurugan_V]

NOTE : sorry the part number is EPM7512AEBI256-7 in MAX 7000AE series.

[ak6dn]

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.

[JohnT_Intel]

Hi,

Could you share with me your board schematic?

[Balamurugan_V]

hello all,

I sort out the problem .blaster is not working properly.

Thanks for your replies.

[JohnT_Intel]

Hi,

I am glad to hear that the issue is due to the blaster and resolved after changing the blaster.