A print head drive circuit drives a print head including an ejecting portion ejecting a liquid in response to a drive signal propagating through a drive signal line and a storage portion storing ejecting portion-related information changing in accordance with use of the ejecting portion, in which processing of reading the ejecting portion-related information changing in accordance with the use from the storage portion is performed before the drive signal for ejecting the liquid from the ejecting portion is supplied to the print head.

The present subject matter relates to disposing memory banks and select register. In an example implementation, a plurality of memory banks is arranged to form a group of memory banks. Each memory bank includes a plurality of memory units. At least one select register generates a select signal to access the memory units in the plurality of memory banks. The at least one select register is disposed at an end of the group of memory banks.

In some examples, a fluid dispensing device component includes a plurality of fluidic dies each comprising a memory, a plurality of control inputs to provide respective control information to respective fluidic dies of the plurality of fluidic dies, and a data bus connected to the plurality of fluidic dies, the data bus to provide data of the memories of the plurality of fluidic dies to an output of the fluid dispensing device component.

In some examples, a fluid dispensing device component includes a plurality of fluidic dies each comprising a memory, a plurality of control inputs to provide respective control information to respective fluidic dies of the plurality of fluidic dies, and a data bus connected to the plurality of fluidic dies, the data bus to provide data of the memories of the plurality of fluidic dies to an output of the fluid dispensing device component.

A method of forming a print head, by forming a heater chip. Via zones having peripheries are defined on a substrate, with heaters formed along the entire peripheries of the via zones. Traces that electrically connect to each of the heaters are formed. In some embodiments, the heater chip is then stored for a period of time. After storing the heater chip, vias are formed in only a selected portion of the via zones, which is a subset of the via zones. A channel layer is formed on the heater chip by forming a first layer on the heater chip. Flow channels are formed in the first layer from the vias to only those heaters on the heater chip that are disposed along the selected portion of the via zones. Bubble chambers are formed in the first layer around only those heaters on the heater chip that are disposed along the selected portion of the via zones. A nozzle plate in formed on the channel layer by forming a second layer on the first layer, and forming nozzles in the second layer above only those heaters on the heater chip that are disposed along the selected portion of the via zones.

An integrated circuit to drive a plurality of fluid actuation devices includes a fire line, a plurality of memory elements, a first switch, and a plurality of second switches. The first switch is electrically coupled between the fire line and a first side of each memory element of the plurality of memory elements. Each second switch is electrically coupled to a second side of a respective memory element of the plurality of memory elements.

In some examples, a circuit includes a data line, an input line, a first memory element, and a decoder to receive an address and to enable the first memory element for access in response to the address. The selector is responsive to the data line to select the first memory element, where the selector is to select the first memory element responsive to the data line having a first value, and where the data line is to communicate data of a second memory element in response to the second memory element being enabled for access. The input line is to communicate data of the first memory element in response to the first memory element being selected by the selector.

An integrated circuit to drive a plurality of fluid actuation devices includes a fire line, a plurality of memory elements, a first switch, and a plurality of second switches. The first switch is electrically coupled between the fire line and a first side of each memory element of the plurality of memory elements. Each second switch is electrically coupled to a second side of a respective memory element of the plurality of memory elements.

A printhead having a number of single-dimensional memristor banks is described. The printhead includes a number of nozzles to deposit an amount of fluid onto a print medium. Each nozzle includes a firing chamber to hold the amount of fluid, an opening to dispense the amount of fluid onto the print medium, and an ejector to eject the amount of fluid through the opening. The printhead also includes a number of single-dimensional memristor banks. Each memristor bank includes a number of memristors arranged in a single dimension and a number of serially-connected de-multiplexers to selectively activate a target memristor of the memristor bank. The number of serially-connected de-multiplexers is equal to the number of memristors and an output of at least one de-multiplexer is an input into a subsequent de-multiplexer.

A print head with a number of memristors and inverters is described. The print head includes a number of nozzles to deposit an amount of fluid onto a print medium. Each nozzle includes a firing chamber to hold the amount of fluid, an opening to dispense the amount of fluid onto the print medium, and an ejector to eject the amount of fluid through the opening. The print head also includes a number of memristor cells. Each memristor cell includes a memristor to store data, a voltage divider serially connected to the 116 memristor cell, and an inverter connected in parallel with the number of memristor cells and the voltage divider.