Dual Transmission Unit Data Pipeline for Electron Beam Writing
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Solution Overview
Problem
In electron beam writing apparatuses, delayed data transmission to the deflection control circuit can lead to stalled writing processing due to limited buffer capacity and asynchronous data input/output operations, causing inefficiencies and interruptions in the writing process.
Innovation Solution
Implementing a configuration where two transmission units alternately perform data input and transmission processing, with one unit inputting data for more processing regions than initially set while the other transmits data in order, ensuring that data transmission is completed without delay by optimizing the timing of data input and transmission based on processing and transmission times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data transmission is performed sequentially after data input processing, then data transmission accuracy is improved, but writing processing speed deteriorates due to delays and interruptions
Solution Approach 1:
The patent applies preliminary action by inputting processing data for N processing regions (where N > n) into the transmission unit before the actual writing processing begins. This advance data preparation ensures that data is ready for immediate transmission when writing starts, eliminating waiting time and maintaining both accuracy and speed. The transmission unit holds pre-input data in memory, allowing seamless transmission without interrupting the writing flow.
Solution Approach 2:
The patent implements dynamics by making the transmission unit operable in two distinct modes: an input operation mode for inputting processing data, and a transmission operation mode for transmitting data to the deflection control circuit. The unit dynamically switches between these modes based on operational requirements. This dynamic operation allows overlapping of data input and transmission activities, ensuring continuous processing without delays while maintaining data integrity through mode-specific operation protocols.
2Device complexity
If buffer capacity is limited to maintain system simplicity, then device complexity is reduced, but data transmission continuity deteriorates causing stalls in writing processing
Solution Approach 1:
The patent applies segmentation by dividing the data processing workflow into distinct functional segments: data input processing, data storage in buffer, and data transmission. The transmission unit itself is segmented into input operation mode and transmission operation mode. This segmentation allows each segment to operate independently and efficiently, with the buffer serving as a controlled intermediary that maintains continuity without requiring excessive capacity. Each segment can be optimized separately, maintaining overall system simplicity.
Solution Approach 2:
The patent ensures continuity of useful action by designing the transmission unit to continuously alternate between input and transmission operations without idle periods. While one data set is being transmitted, another is being input into the buffer. This continuous operation eliminates stalls in the writing processing pipeline. The buffer capacity is sized to maintain this continuity - large enough to prevent stalls but not excessively large to complicate the system.
3Productivity
If data input and transmission are performed asynchronously to improve throughput, then processing efficiency is improved, but writing processing stability deteriorates due to timing mismatches and delays
Solution Approach 1:
The patent implements periodic action by establishing a regular alternation pattern between input operation mode and transmission operation mode in the transmission unit. This periodic switching creates a predictable, rhythmic flow of data through the system. The periodic nature ensures that data input and transmission are synchronized in a stable pattern, preventing timing mismatches. The regular cycle maintains both high throughput (efficiency) and predictable operation (stability), as the system knows exactly when to expect data arrivals and transmissions.
Data Source
AI summary
A charged particle beam writing apparatus includes first and second transmission units to perform first and second transmission processing, where, in the first transmission processing, while one of the units performs data transmission processing, the other unit inputs processing data for N processing regions more than pre-set, data-converted, n processing regions, and while one of the units performs data input processing, the other transmits processing data for (N-n) processing regions in order, and in the second transmission processing, processing data for remaining n processing regions are transmitted in order after the first transmission processing, where one of the units starts inputting the processing data while the other performs the first transmission processing, and does not input processing data for a new processing region after starting the second transmission processing.