In my design security bit is not set and even i kept the option clicked to use JTAG pins for BST support. The same .pof i am able to download in the other batch of CPLDs. This particular batch is creating trouble. Initially i could program with some difficulty by erasing then examine and then by trying program/configure, in this way when i tried some 2-3 times i could program but then in between i again wanted to reprogram, but was not happening then a added as suggested in one of the literature to use 1k in between TCk and GND, 10K in between TMS to VCC and TDI(optional) 10K to VCC. I tried i could program but now this also is not working, This problem i am facing on all boards which is having this particular batch of components.
Dear All
I am using Quartus 8.0 and USB blaster ver3 for program/configure CPLD MAX3512AFI256-10. Earlier i programmed this device on my boards with lot of difficulty. But now i want to reprogram, so clicked program/configure, after 98% gives error, "Can't verify device number 1",öperation failed. This problem is with all boards. Now working boards are unusable, as i could not reprogram. This problem is with a batch of components. Earlier i bought i did not face any problem. Kindly suggest how to reprogram, to make them usable boards.
Thanks