Altera Flex10K, EPF10K10LC84 dev board

Hi,

i have tested the flex10k device with the jtag debugger and it says there is uncertain device on the jtag chain with error on clock ... it sound very bad, because when i plug the maxII chip it says "EPM1270 detected" with a lot of info about.

i have no option switch in order to select the on board byteblaster or the jtag on which to plug the usbblaster. No dip switch, no jumper, nothing.

I am using flex10k because I have a tube of 50 flex10k chips, bought for cheap ($10 for the whole) and they are good as the fact they are ram-configurable device (it has a ram inside which stores the bitstream config), my maxII is flash configurable device (it has a flash inside which stores the bitstrea), i prefer the ram method =P

is there any other cpld or fpga with ram config instead of flash config ?

about cyclone i will buy the DE0-nano board soon, but about toying i really like flex10k, which is plcc84 package and should works very well @5V

thank you to have explained me the jtag sensing pin, which is called Power but the real meaning is understanding if the target is 3.3V or 5V: my usb blaster cable should be an original altera one, but i got it form china so i don'r really know, anycase i also got a kit from altera which include an original usbblaster and i will use it.

Ok, today i will reverse enge the flex10k in order to understand how the chip is wired to the jtag connector and to the clock generator.

I am using this board in order to understand how to build my own flex10k board, have you got any suggestion / schematic example or other to get me started ?

regards