Semiconductor LUN Selection Cycle for Lower Command Overhead
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Solution Overview
Problem
Existing semiconductor systems face increased command overhead and complexity in NAND flash memory systems due to the use of serial command address interfaces, which affect performance and require complex internal circuits for parallel operations.
Innovation Solution
Implementing a logical unit number (LUN) selection cycle in semiconductor systems, where a selection signal is transmitted before command and address signals, allowing for reduced command overhead and simplified internal circuits by eliminating unnecessary address cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If NAND interface method is used to transmit command and data through the same bus, then device complexity is reduced, but command overhead increases and performance deteriorates
Solution Approach 1:
The patent segments the transmission process into distinct cycles: LUN selection cycle, command cycle, address cycle, and data cycle. This segmentation allows command overhead to be processed separately from data transmission, improving performance without requiring complex parallel circuits.
2Productivity
If SCA interface method is used to transmit command and data through different buses, then command overhead is reduced, but internal circuit complexity increases for parallel operations
Solution Approach 1:
The patent implements periodic action by using separate cycles for different operations: LUN selection cycle for device selection, command cycle for command transmission, address cycle for address transmission, and data cycle for data transfer. This periodic structure reduces command overhead while avoiding the need for complex parallel circuits.
3Loss of information
If multiple address cycles are used for data input operations, then address transmission is completed, but command overhead increases by up to five cycles
Solution Approach 1:
The patent applies preliminary action by transmitting the LUN selection signal in advance during a dedicated LUN selection cycle before the command and address cycles. This preliminary selection reduces the number of address cycles needed from five to one, significantly reducing command overhead while ensuring proper device selection.
4Loss of information
If multiple address cycles are used for data output operations, then address transmission is completed, but command overhead increases by three cycles
Solution Approach 1:
The patent uses preliminary action by establishing device selection through the LUN selection signal in advance. This allows the system to reduce address cycles from three to one for data output operations, decreasing command overhead while maintaining proper address transmission functionality.
Data Source
AI summary
A semiconductor system includes a first semiconductor apparatus and a second semiconductor apparatus. The first semiconductor apparatus transmits a command signal during a command cycle and transmits an address signal during an address cycle. The first semiconductor apparatus transmits a selection signal during a LUN selection cycle before the command cycle. The second semiconductor apparatus performs a data input/output operation based on the selection signal, the command signal, and the address signal.