Accessing registers of fluid ejection devices
AssigneeHewlett-Packard Development Company, L.P.
InventorsScott A. Linn, James Michael Gardner, Michael W. Cumbie
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Abstract
An integrated circuit to drive a plurality of fluid actuation devices includes a status register, a plurality of interfaces, and control logic. The plurality of interfaces include a mode interface, a data interface, and a fire interface. The control logic enables reading of the status register in response to a signal on the mode interface transitioning to logic high with a logic high signal on the data interface, and transitioning a signal on the fire interface to logic high with the signal on the single data interface floating.
Claims19
An integrated circuit for a fluid ejection device, the integrated circuit comprising:
- a status register;
- a plurality of interfaces comprising a mode interface, a fire interface, and a data interface;
- and
- control logic to enable reading of the status register in response to both a signal on a single mode interface transitioning to logic high with a logic high signal on the single data interface and transitioning a signal on the fire interface to logic high with the signal on the single data interface floating,
- wherein the single data interface is to input data to the integrated circuit and output data from the integrated circuit.
A method for accessing a fluid ejection die, the method comprising:
- setting a signal on a single data contact pad of the fluid ejection die to logic high;
- transitioning a signal on a single mode contact pad of the fluid ejection die to logic high;
- floating the signal on the single data contact pad with the signal on the single mode contact pad logic high;
- transitioning a signal on a fire contact pad of the fluid ejection die to logic high with the signal on the single data contact pad floating;
- and
- enabling reading of a status register of the fluid ejection die in response to transitioning the signal on the fire contact pad to logic high with the signal on the single data contact pad floating.
Dependencies are inferred from the claim text.