622
6 Reverse Engineering of Microcircuits
Fig. 6.95 SPICE modeling of the circuit operation. The topology fragment is visually determined
by the intruder as a circuit containing an inverter, a NAND gate and a NOR gate and shall ensure
execution of the OUT = YVDATA2VDATA3 function. In reality, the circuit functions as an inverter
at the input OUT = DATA2 [27]
Fig. 6.96 An example of implementation of a reverse engineering countering method. NOR gate
with stuck-open p-type MOSFET and stuck-closed n-type MOSFET [27]
6 Reverse Engineering of Microcircuits
Fig. 6.95 SPICE modeling of the circuit operation. The topology fragment is visually determined
by the intruder as a circuit containing an inverter, a NAND gate and a NOR gate and shall ensure
execution of the OUT = YVDATA2VDATA3 function. In reality, the circuit functions as an inverter
at the input OUT = DATA2 [27]
Fig. 6.96 An example of implementation of a reverse engineering countering method. NOR gate
with stuck-open p-type MOSFET and stuck-closed n-type MOSFET [27]