AR# 340: XACT 5.0 Programmable Key: May not be recognized/transparent on some machines
XACT 5.0 Programmable Key: May not be recognized/transparent on some machines
Xilinx has found that there are some parallel ports that have been manufactured with out the IBM specified pullup resistors on the port io pins. This will cause the XILINX PROGRAMABLE KEY to not get any power and thus fail to function. One example of this is demonstrated when XKEY fails and states that the key could not be found on any parallel port.
The parallel port pullup problem may also take the form of the keys not being recognized when both a Viewlogic AA key and Xilinx programmable key are connected to the same port.