Analog Peak Power Management for Simultaneous Multi-Die Operations
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Solution Overview
Problem
Existing NAND storage systems face limitations in performing multiple peak power operations simultaneously due to restricted power usage, leading to inefficient system loading and unnecessary over-management, particularly when memory dies are grouped into multiple groups.
Innovation Solution
A peak power management system with multiple PPM groups, each containing PPM circuits with pull-up and pull-down drivers, resistors, and interconnected PPM pins, manages peak power operations based on electric potential, using comparators and RC filters to coordinate power usage across memory dies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple peak power operations are performed simultaneously on multiple memory dies, then power utilization efficiency is improved, but system power management complexity increases
Solution Approach 1:
The system divides memory dies into multiple Power Management Groups (PMGs), where each PMG independently manages peak power operations for a subset of memory dies. This segmentation allows parallel power management across groups while keeping each group's control logic relatively simple, resolving the contradiction between enabling multiple simultaneous operations and maintaining manageable system complexity.
Solution Approach 2:
The patent introduces a hierarchical power management structure with multiple dimensions: PMG-level coordination and die-level coordination. By adding the PMG dimension, the system can manage multiple dies simultaneously across different groups without requiring a single centralized controller to manage all dies, thus improving power utilization while controlling complexity through distributed management.
2Ease of operation
If memory dies are grouped into two dies per group for coordination, then coordination between dies is simplified, but the number of simultaneous peak power operations is limited
Solution Approach 1:
The system segments memory dies into multiple PMGs, with each PMG containing multiple memory dies (not limited to two). Each PMG can perform peak power operations independently, and multiple PMGs can operate simultaneously. This segmentation allows the system to maintain coordination simplicity within each PMG while dramatically increasing the total number of simultaneous operations across all PMGs.
Solution Approach 2:
The patent merges multiple PMGs into a unified power management system where each PMG operates semi-independently but contributes to the overall system capacity. By combining multiple grouped dies across different PMGs, the system achieves both coordination simplicity (within groups) and high productivity (across all groups operating in parallel).
Data Source
AI summary
Methods of peak power management (PPM) for a storage system having multiple memory dies are disclosed. Each memory die includes a first PPM circuit and a second PPM circuit. First PPM circuits of the multiple memory dies are electrically connected to form a first PPM group. Similarly, second PPM circuits are electrically connected to form a second PPM group. Peak power operations can be managed by switching on a first pull-down driver of the first PPM circuit on a selected memory die when a first PPM enablement signal of the first PPM group is zero; waiting for a first delay period; switching on a second pull-down driver of the second PPM circuit on the selected memory die when a second PPM enablement signal of the second PPM group is zero. The PPM enablement signals depend on the current flowing through each pull-down driver in the first and second PPM groups.