Memory Command Interface Frequency Mode Detection
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Solution Overview
Problem
Traditional memory command execution methods use a static clock cycle frequency, leading to inefficient execution times for commands that can execute in fewer clock cycles, as they often require additional cycles, limiting data processing efficiency and IO data rates.
Innovation Solution
Implementing multiple frequency modes, such as 1N and 2N modes, allows for dynamic command execution frequency changes, enabling reduced latency for commands with narrow processing windows while supporting commands with wider windows, thereby enhancing data processing efficiency and IO data rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a static clock cycle frequency is used to execute memory commands, then all commands can be executed with a uniform timing window, but commands that can execute in fewer clock cycles experience inefficient execution times and reduced productivity
Solution Approach 1:
The system dynamically switches between different frequency modes (1N, 2N, 4N) based on the specific command being executed. The memory device receives a frequency mode indicator with each command and adjusts its internal clocking accordingly, allowing fast commands to execute in fewer cycles while maintaining proper timing for commands requiring wider windows.
Solution Approach 2:
The invention changes the clock frequency parameter dynamically by implementing multiple frequency modes (1N, 2N, 4N) where N represents the base clock cycle. This allows the system to optimize execution time for different command types by selecting the appropriate frequency mode, thereby improving overall productivity without sacrificing timing accuracy.
2Productivity
If a static clock cycle frequency is used, then the system design is simpler, but the IO data rate is limited and command execution efficiency is reduced
Solution Approach 1:
The frequency mode indicator is provided in advance with each command, allowing the memory device to pre-configure its internal timing circuits before executing the command. This preliminary setup enables efficient multi-frequency operation without requiring complex real-time switching mechanisms during command execution.
Solution Approach 2:
The memory device is designed to handle multiple frequency modes (1N, 2N, 4N) within a single unified architecture. The same command interface and execution pipeline can operate at different frequencies by simply interpreting the frequency mode indicator, avoiding the need for separate hardware paths for each frequency mode and thus limiting the increase in device complexity.
Data Source
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AI summary
The systems and methods (120) provided herein identify a command acquisition mode from a plurality of command acquisition modes of a command interface (14) of a memory device (10). A state of a chip select signal (CS) is identified. When the CS transitions to low from high, a first portion of a command address is captured in a first clock cycle after the CS transitions. When the command acquisition mode is in a first mode, a second portion of the command address is captured in a second clock cycle immediately after the first clock cycle. Otherwise, when the command acquisition mode is in a second mode, the second portion of the command address is captured in a third clock cycle immediately following the second clock signal. An internal command is fired, using the first portion of the command address and the second portion of the command address.