Semiconductor Command Receiver Latency Control
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Solution Overview
Problem
Existing semiconductor devices face challenges in reducing power consumption due to frequent activation and deactivation of command receivers, especially when the chip select signal changes frequently, leading to high charging and discharging currents.
Innovation Solution
Implementing a semiconductor device with a command receiver that activates in response to a chip select signal and remains active for a first latency period, then deactivates only after a second latency period that is longer than the first, thereby maintaining the active state even during frequent chip select signal changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the command receiver is activated and deactivated in response to frequent chip select signal changes, then the device can respond to each chip select signal, but the charging and discharging currents increase leading to higher power consumption
Solution Approach 1:
The command receiver's activation state is dynamically controlled based on timing conditions. Instead of simply following chip select signal transitions, the receiver remains activated during a first latency period after activation and is deactivated only after a second latency period following deactivation. This dynamic timing-based control reduces unnecessary activation/deactivation cycles while maintaining proper response to valid commands, thereby reducing power consumption without sacrificing reliability
Solution Approach 2:
The command receiver is preliminarily activated in advance of when it is actually needed to receive commands. By keeping the receiver activated during the first latency period after chip select signal activation, the system ensures that commands arriving during this period are not lost, while avoiding frequent activation/deactivation that would increase power consumption
2Use of energy by moving object
If the command receiver remains activated for a longer duration, then power consumption is reduced by minimizing activation/deactivation cycles, but the timing for deactivating the receiver becomes more complex to control
Solution Approach 1:
The command receiver operates with periodic timing actions defined by the first and second latency periods. The activation and deactivation follow a regular periodic pattern based on these latency values, which simplifies the control logic compared to complex conditional decisions. The periodic nature of the timing-based control reduces device complexity while maintaining reduced power consumption
Solution Approach 2:
The system uses parameter changes in the form of latency periods (first latency and second latency) to control the command receiver's activation state. By changing the timing parameters rather than using complex logical conditions, the system achieves reduced power consumption with simpler control logic. The latency parameters provide a straightforward mechanism to adjust receiver behavior without increasing device complexity
Data Source
AI summary
One controller for controlling operation of a memory device includes an output circuit configured to supply a chip select signal, an address signal, a command signal, and a clock signal to the memory device, and a data processing circuit configured to process read data and write data through a data terminal based on the chip select signal, the address signal, the command signal, and the clock signal supplied by the output circuit. The controller is configured to supply the address signal and the command signal to the memory device a predetermined duration after the output circuit supplies the chip select signal.