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Dangerous Prototypes

Dangerous Prototypes => Bus Blaster JTAG debugger => Topic started by: Gracana on March 09, 2014, 06:16:23 am

Title: TDO Stuck
Post by: Gracana on March 09, 2014, 06:16:23 am
It seems that something is wrong with the v3c bus blaster I just received.

If I program the CPLD with v1.4 buffer logic and try 'detect' with TDO tied to VTG or GND, I see "warning: TDO seems to be stuck at 1."

If I program the CPLD with v1.2 buffer logic and try 'detect' with TDO tied to VTG or GND, I see "warning: TDO seems to be stuck at 0."

Is it broken?
Title: Re: TDO Stuck
Post by: Gracana on March 09, 2014, 05:33:55 pm
Further testing with a multimeter shows that CPLD pin 14 always measures approximately 2.8V when programmed with buffer logic >1.2. Under this condition, JTAG software always reads ones. When the CPLD is programmed with buffer logic 1.2, CPLD pin 14 always measures approximately 1V, and JTAG software always reads zeroes.
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