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Hi everybody
I've a problem with my MAXII I can't tranfert my program with quartus. When my CPLD is under 3V I measure an impedance of 10K on TDI and more than 1M for other between ground and th pins. Now when I plug the USB blaster and an oscilloscope on JTAG pins I have the following result when I press start in the programmer: TDO: 1.5V peak TCK: 3V peak TDI: 3V peak TMS: nothing I thougth my CPLD was dead but when I turn off the CPLD there is no more signal on JTAG pins. Someone have an idea ?Link Copied
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"TMS: nothing" means, the pin is either shorted or the programmer connection broken. You have to fix this first.
P.S.: --- Quote Start --- When my CPLD is under 3V I measure an impedance of 10K on TDI and more than 1M for other between ground and th pins. --- Quote End --- Seems like the design lacks the suggested TCK pulldown resistor.- Mark as New
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--- Quote Start --- "TMS: nothing" means, the pin is either shorted or the programmer connection broken. You have to fix this first. --- Quote End --- I try again to find what's going on this pin. --- Quote Start --- P.S.: Seems like the design lacks the suggested TCK pulldown resistor. --- Quote End --- I've read that altera device had intern weak pull up/down resistor and that was useless to add external resistor. But I'll try it too. Thanks for your help. I'll post when I've fix it (or not :cry:).
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I've add the pull up and the pull down resistor and when I press start on the programmer
TDO: 1.5 V peak 0 before TCK: 3V peak 0 before TDI: 0.6V before then 0V then 3v when I click TMS: 0V before at 3V But my device is not recognised, I can't program it.
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