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the board is made with a 74xx244 chip puted on a dip socket, and it also has got an LPT connector which should be plugged into a PC parallel port, but the board has a JTAG connector which should pin to pin compatble with the usb-blaster cable.
I say "it should" because i have no schematic or pinout, and i have only checked that the two gnd signals of the jtag connector are matching with the ones on the jtag cable, and they do!
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Boards that have two programming options quite often have a jumper or DIP switch to select what is in control of the JTAG interface. You should toggle a signal on the TCK line with TMS held high, and probe the FPGA to see if you can see the TCK waveform. The JTAG debugger tool will allow you to generate toggling signals.
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I don't know where TDI/TDO/TMS etc are routed to the fpga chip, i only trust they are right as the fact the connector is labeled "jtag".
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Their pin assignments are fixed. Just probe the pins on the device.
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my usb blaster cable has the Vcc removed, so it does not power the pcb, the powersupply is applied from an external 5V 2A DC device.
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The VCC on the 10-pin JTAG header does not power the board, it is there to power the buffer located inside the JTAG cable. That buffer implements logic level translation between the 3.3V CPLD and the JTAG buffers on whatever board you are using.
If you do not have that pin connected to the USB-Blaster, then the TCK/TMS/TDI signals will never toggle.
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anyway the MAX-II board is working with success this way.
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Then you have something wrong with your USB-Blaster. Is it an Altera or Terasic USB-Blaster, or is it a clone?
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but i really want to put my 84plcc flex10K chip into a plcc socket soldered on a 1000 holes proto board, any schematic around in order to do that ?
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Just draw one.
Why are you even thinking about using a FLEX10K device. They're old and useless. Buy a Cyclone device for $15 and you have access to SignalTap II logic analyzer, JTAG to the FPGA fabric, on-chip PLLs, LVDS I/Os, etc.
The FLEX devices are old and dead, its time for you to move on to a more modern device.
Cheers,
Dave
Honored Contributor
