Print Engine Having Authentication Device For Preventing Multi-Word Memory Writing Upon Power Drop
First Claim
1. A print engine comprising at least one print controller and at least one associated authentication device, each authentication device having a processor, non-volatile memory, an input for receiving power from a power supply and a power detection unit, wherein each authentication device is configured to enable multi-word writes to the non-volatile memory under control of the associated print controller,wherein the processor is configured to control and trim the amount of power supplied to the input to predetermine a threshold at which operation of the authentication device is established;
- andthe power detection unit is configured to monitor a voltage level of the power supplied to the input, and in the event the voltage level drops below the predetermined threshold, preventing subsequent words in any multi-word write currently being performed from being written to the memory.
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Accused Products
Abstract
A print engine comprising at least one print controller and at least one associated authentication device is provided. Each authentication device has a processor, non-volatile memory, an input for receiving power from a power supply and a power detection unit. Each authentication device is configured to enable multi-word writes to the non-volatile memory under control of the associated print controller. The processor is configured to control and trim the amount of power supplied to the input to predetermine a threshold at which operation of the authentication device is established. The power detection unit is configured to monitor a voltage level of the power supplied to the input, and in the event the voltage level drops below the predetermined threshold, preventing subsequent words in any multi-word write currently being performed from being written to the memory.
29 Citations
4 Claims
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1. A print engine comprising at least one print controller and at least one associated authentication device, each authentication device having a processor, non-volatile memory, an input for receiving power from a power supply and a power detection unit, wherein each authentication device is configured to enable multi-word writes to the non-volatile memory under control of the associated print controller,
wherein the processor is configured to control and trim the amount of power supplied to the input to predetermine a threshold at which operation of the authentication device is established; - and
the power detection unit is configured to monitor a voltage level of the power supplied to the input, and in the event the voltage level drops below the predetermined threshold, preventing subsequent words in any multi-word write currently being performed from being written to the memory. - View Dependent Claims (2, 3, 4)
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Specification