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Altera_Forum
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12 years ago

USB Blaster problem

Hello, I have a chip USB Blaster Rev C. When I program CPLD EPM7064SLC44-10 with Quartus II sp2 12.0 programmer, the process bar goes to 100% and then it shows "Failed". How can I fix this erro...
Altera_Forum's avatar
Altera_Forum
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12 years ago

Hi Yaroslav,

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The solution was to connect USB-Blaster directly to CPLD (through 74HC244)

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What was wrong with the 74LVC125 on the SiLabs USB-Blaster?

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connect VCCtarget and +5Vcpld together

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Your board should have already done that, i.e., the VCC_TARGET pin on the USB-Blaster is supposed to power the buffer inside the USB-Blaster. That is how the USB-Blaster ensures the logic levels transmitted to the board are compatible with the device.

If your board did not connect VCC_TARGET, then that would explain the problem.

Cheers,

Dave