SDIO Device Wake-Up Control via Data Bus Signal Switching
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Solution Overview
Problem
SDIO devices face challenges in waking up from sleep mode efficiently when supplied with lower voltages, as they struggle to decode high-frequency signals, leading to increased wake-up time and power consumption.
Innovation Solution
A wake-up mechanism is implemented using channels on the traditional SDIO data bus to transmit wake-up requests and acknowledgement responses, allowing the SDIO device to switch between operation modes by writing control values into registers and sending signals through data terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the supply voltage level is decreased to reduce static power dissipation, then power consumption is reduced, but the capability of the SDIO device for receiving incoming signals is affected
Solution Approach 1:
The patent implements dynamic voltage scaling by switching between different voltage levels (first voltage level during sleep mode, second voltage level during active mode) based on the operational state of the SDIO device. This allows the system to optimize power consumption during idle periods while ensuring full performance when the device is actively receiving signals.
Solution Approach 2:
The patent changes the supply voltage parameter from a fixed level to a variable level that adapts to the operational requirements. By adjusting the voltage level according to whether the device is in sleep or active mode, the system achieves both low power consumption and reliable signal reception at appropriate times.
2Loss of energy
If the SDIO device operates with low supply voltage in sleep mode, then power consumption is reduced, but the wake-up time increases due to inability to correctly decode high frequency signals
Solution Approach 1:
The patent segments the wake-up process into two distinct phases: a first wake-up phase using a first voltage level for initial signal detection, and a second wake-up phase using a second voltage level for complete operational readiness. This segmentation allows the device to use lower voltage for the initial wake-up trigger while ensuring full signal decoding capability is activated subsequently.
Solution Approach 2:
The patent performs preliminary voltage level switching before the device needs to fully operate. By switching to the higher second voltage level after detecting the wake-up signal but before resuming full operations, the device ensures it has sufficient power for signal decoding without maintaining high power consumption continuously.
Data Source
AI summary
Described in embodiments herein are techniques for placing a secure digital input output (SDIO) device in a sleep mode and waking up the SDIO device from the sleep mode. In accordance with an embodiment, a method of controlling the SDIO device comprising: writing a control value into a register of the SDIO device; allowing the SDIO device to switch to a first operation mode based on the control value written into the register; sending a first signal to the SDIO device through a first data terminal of the SDIO device; and allowing the SDIO device to switch to a second operation mode based on the first signal.