Single-Port RAM FIFO Circuit with Control Unit for Timing Overlap Avoidance
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Solution Overview
Problem
Conventional FIFO circuits face challenges in increasing data capacity while minimizing circuit scale, especially for large-capacity applications, and often require careful timing synchronization between write and read operations, which can be impractical.
Innovation Solution
A semiconductor device incorporating a single-port RAM and D-type flip-flops, along with control circuits to manage write and read operations, avoids timing overlap by using write and read RAM signals generated through logical operations, allowing for increased data capacity with minimal circuit area expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a dual-port RAM is used to implement a large-capacity FIFO circuit, then the data capacity can be increased, but the circuit scale increases and timing synchronization becomes complex
Solution Approach 1:
The FIFO circuit is segmented into three functional blocks: a write block for data input, a read block for data output, and a single-port RAM for storage. This segmentation allows each block to be optimized independently, reducing overall circuit complexity while maintaining large data capacity
Solution Approach 2:
A control unit acts as an intermediary between the write block and read block, managing the single-port RAM's access timing. This intermediary coordinates write and read operations to prevent timing conflicts, eliminating the need for complex dual-port synchronization mechanisms
2Quantity of substance
If a dual-port RAM is used to implement a large-capacity FIFO circuit, then the data capacity can be increased, but timing synchronization between write and read ports becomes difficult
Solution Approach 1:
The control unit serves as an intermediary that manages all access to the single-port RAM, coordinating write and read operations sequentially. This eliminates the timing synchronization difficulties inherent in dual-port RAM by ensuring only one operation occurs at a time
Solution Approach 2:
The control unit uses periodic clock signals to manage write and read operations in discrete time slots. By controlling when write and read operations occur periodically, the system prevents timing overlaps while maintaining large data capacity
3Device complexity
If a single-port RAM is used with regular write or read timing, then the circuit scale is minimized, but perfect asynchronization between input and output timing cannot be achieved
Solution Approach 1:
The control unit dynamically adjusts the timing of write and read operations based on actual data flow requirements. Instead of fixed periodic timing, the system adapts timing dynamically while using a single-port RAM, achieving both small circuit scale and timing flexibility
Solution Approach 2:
The system changes the timing parameters of write and read operations dynamically through the control unit. By modifying when access operations occur rather than using fixed timing, the system achieves asynchronization capability while maintaining simple single-port RAM architecture
Data Source
AI summary
A semiconductor device including a FIFO circuit in which a data capacity can be increased while minimizing an increase in a circuit scale is provided. The semiconductor device includes a single-port type storage unit (11) which stores data, a flip-flop (12) which temporarily stores write data (FIFO input) or read data (FIFO output) of the storage unit (11), and a control unit (14, 40) which controls a write timing of a data signal, which is stored in the flip-flop (12), to the storage unit (11) or a read timing of the data signal from the storage unit to avoid an overlap between a write operation and a read operation in the storage unit (11).