ODT Enable Control Circuit for Consecutive Pin Flip Timing
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Solution Overview
Problem
The enable state of an ODT path cannot be accurately controlled, leading to current waste and increased power consumption, particularly when the voltage level of the ODT pin is flipped over for two consecutive times, resulting in the ODT path failing to be enabled.
Innovation Solution
An enable control circuit comprising a counter circuit, a selection circuit, and a control circuit is used to control the ODT path. The counter circuit counts clock cycles and determines a clock cycle count value, while the selection circuit sets a target value based on settings, and the control circuit enables or disables the ODT path accordingly, ensuring it is enabled after the voltage level switch and disabled when necessary to save power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ODT path is continuously enabled to ensure accurate control, then the reliability of ODT path control is improved, but the power consumption increases due to current waste
Solution Approach 1:
The ODT path enable state is dynamically adjusted based on voltage level flip detection. The control circuit monitors voltage level changes on the ODT pin and selectively enables the ODT path only when flips are detected, rather than maintaining a static enabled state. This dynamic control resolves the contradiction by ensuring reliable control during critical transitions while reducing power consumption during stable periods.
Solution Approach 2:
The control circuit incorporates feedback mechanisms to detect voltage level flips on the ODT pin and uses this information to control the enable state of the ODT path. The feedback loop continuously monitors the ODT pin voltage level and adjusts the ODT path enable state accordingly, ensuring accurate control when needed while minimizing power consumption when voltage levels are stable.
2Reliability
If the ODT path is enabled continuously to handle consecutive voltage level flips, then the reliability of ODT path operation is improved, but the current waste increases
Solution Approach 1:
The system dynamically responds to consecutive voltage level flips by detecting each flip event and temporarily enabling the ODT path only during and immediately after the flip occurs. This dynamic enablement ensures the ODT path is operational during critical transitions even when multiple flips occur consecutively, while avoiding continuous enablement that would waste current during stable periods between flips.
Solution Approach 2:
The control circuit employs periodic sampling and detection of voltage level flips, enabling the ODT path in periodic intervals corresponding to detected flip events rather than maintaining continuous enablement. This periodic action ensures the ODT path is activated when voltage transitions occur (handling consecutive flips) while remaining disabled during intervals without flips, thus reducing current waste.
3Measurement precision
If the counter circuit tracks clock cycles to control ODT path timing, then the precision of ODT path control is improved, but the device complexity increases
Solution Approach 1:
The control circuit is segmented into distinct functional modules: a voltage level flip detection module, a clock cycle counting module, and an ODT path control module. The counter circuit is further segmented into individual flip-flops that can be selectively enabled or disabled based on flip detection. This segmentation improves timing precision through dedicated counting functionality while managing complexity by isolating the counter logic to specific modules rather than distributing it throughout the entire system.
Solution Approach 2:
The counter circuit is pre-configured with a predetermined number of flip-flops corresponding to the required clock cycle count. This preliminary configuration allows the system to accurately track clock cycles without requiring complex runtime calculations or dynamic resource allocation. The pre-established counter structure provides precise timing control while keeping the device complexity manageable through standardized, pre-designed counter logic.
Data Source
AI summary
An enable control circuit, which includes a counter circuit configured to count a current clock cycle and determine a clock cycle count value; a selection circuit configured to determine a clock cycle count target value according to a first setting signal; and a control circuit configured to control an ODT path to be enabled and start the counter circuit when the voltage level of an ODT pin signal is flipped over, control the ODT path to be switched from being enabled to disabled when the clock cycle count value reaches the clock cycle count target value and the voltage level of the ODT pin signal is not changed, and control the ODT path continue to be enabled when the clock cycle count value reaches the clock cycle count target value and the voltage level of the ODT pin signal flips again.