Fluid Ejection Register Access via Serial Interface
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Solution Overview
Problem
The challenge is to reduce the width of semiconductor dies containing fluid actuation devices while maintaining functionality, as narrower dies have less available area for circuitry, which complicates the management of configuration and status registers in fluid ejection systems like inkjet printers.
Innovation Solution
The solution involves enabling a configuration register for writing and a status register for reading through specific signal transitions on contact pads, allowing for efficient data exchange and management within the reduced die area, using control logic to manage these registers and interfaces for fluid ejection systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the width of semiconductor dies is reduced, then the productivity and manufacturability are improved, but the area available for circuitry decreases, making it difficult to manage configuration and status registers
Solution Approach 1:
The patent combines configuration and status register access with the existing serial data interface used for droplet ejection control. By merging these functions into a single serial communication pathway, the design eliminates the need for separate wide data buses, thereby reducing die width while maintaining full register management capability.
Solution Approach 2:
The patent transitions from parallel data access (wide bus) to serial data access (narrow bus), effectively changing the dimension of data transmission from multiple simultaneous lines to a single time-multiplexed line. This dimensional change allows the same functionality to be achieved with significantly reduced die area.
2Ease of manufacture
If the die area is reduced, then the manufacturing cost decreases, but the complexity of managing registers through limited interfaces increases
Solution Approach 1:
The serial data contact pad is designed to serve multiple functions: it carries control signals for droplet ejection, transmits configuration data to registers, and outputs status information from registers. This multi-functional design eliminates the need for separate dedicated interfaces, reducing both physical complexity and manufacturing cost while maintaining full system control capability.
Solution Approach 2:
The system dynamically switches between different operational modes (droplet ejection control, configuration writing, status reading) through time-multiplexed signal transitions. The contact pads and control logic adapt their function based on the current operational phase, allowing a single interface to handle diverse tasks without requiring physically separate circuits for each function.
3Loss of substance
If narrow die width is used, then the material usage and production efficiency improve, but the available space for circuitry and signal routing is reduced
Solution Approach 1:
The patent merges multiple signal functions into a single serial data pathway, combining configuration input, status output, and control signaling into one time-multiplexed interface. This consolidation dramatically reduces the number of required contact pads and interconnect lines, thereby reducing die width and material usage while keeping the circuit layout manageable through systematic signal sequencing.
Data Source
AI summary
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.