Encryption control circuit for e.g. chip card, has processing prevention unit having multiplexer with control input connected to bus control to prevent processing of signal on bus by receiver, in response to control signal from bus control

摘要

The circuit has two receivers (104a,104c) coupled to a bus (106) for processing a signal on the bus. A transmitter (102) is coupled to the bus for transmitting the signal on the bus. A processing prevention unit has a multiplexer with a control input connected to a bus control (114) to prevent the processing of the signal on the bus by the receiver (104c), in response to control signal from the bus control. Independent claims are also included for the following: (a) a method for controlling encryption control circuit (b) a computer program having computer code for implementing a method for controlling encryption control circuit.