PCB PLD Power-On Sequencing for Live Board Replacement
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Solution Overview
Problem
Programmable devices like FPGAs and some ASICs, due to their configuration time requirements, are unsuitable for implementing live power ON functionality on circuit boards without initial power ON analysis, leading to issues with electrical and timing mismatches when used as one-to-one replacements for obsolete devices.
Innovation Solution
A method for controlling the power ON sequence of programmable devices on a PCB, where the PLD waits to turn ON first, ensuring proper state maintenance of input/output pins and allowing configuration with known states, using pull-up and pull-down resistors and resistor-capacitor networks to manage switching hazards during power supply changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PLD is used as a one-to-one functional replacement for obsolete devices, then functional compatibility is improved, but electrical and timing specification mismatches occur
Solution Approach 1:
The patent applies parameter changes by adjusting the power-on sequence timing parameters to match the specific electrical and timing requirements of different PLD devices. By modifying the delay values and sequencing timing, the system achieves compatibility across different device specifications without requiring hardware changes.
Solution Approach 2:
The patent implements dynamics by making the power-on sequence controllable and adjustable rather than fixed. The system dynamically adapts the sequencing timing based on the specific PLD device characteristics, allowing flexible adjustment of power application timing to match different device requirements.
2Adaptability or versatility
If PLD configuration time is considered, then programmability and scalability are improved, but live power ON functionality is compromised
Solution Approach 1:
The patent applies preliminary action by pre-configuring the PLD device before it becomes operational. The power-on sequence is designed to automatically complete the configuration process during the power application phase, ensuring the device is ready for immediate use without requiring separate configuration steps or interrupting live operations.
Solution Approach 2:
The patent implements self-service by enabling the PLD to automatically configure itself during the power-on sequence. The device performs its own configuration without external intervention, and the power sequencing is designed to facilitate this self-configuration process, making the device ready for live power-on functionality autonomously.
3Manufacturing precision
If power ON sequence is optimized for PLD configuration, then configuration completeness is improved, but conflicts with other on-board electronics may occur
Solution Approach 1:
The patent applies segmentation by dividing the power-on sequence into distinct phases or segments that can be independently controlled. This allows different portions of the circuit to be powered in a specific sequence, ensuring PLD configuration requirements are met while preventing conflicts with other electronics that may have different power-up requirements.
Solution Approach 2:
The patent uses an intermediary approach by introducing control logic or sequencing circuitry that mediates between the PLD configuration requirements and the power-on needs of other on-board electronics. This intermediary layer coordinates the power distribution to satisfy both the PLD's configuration timing and the operational requirements of other components.
Data Source
AI summary
A PCB includes a programmable logic device (PLD), a memory, a live power ON sequence algorithm, and other electronics. The PLD is connectable to a primary DC power supply. The PLD is configurable by a configuration memory device having stored PLD configuration information. Upon completion of the configuring the PLD generates a PLD control signal or the algorithm triggers generation of a PLD control signal substitute to indicate a configuration of PLD is complete and the PLD is in active mode. Power coupling includes the primary DC power supply coupled to a power input of an electronic switch or the primary DC power supply wiring coupled to a power input of a second DC power supply. The PLD control signal or substitute provides an enable signal that controls power arriving through the electronic switch or from the second DC power supply to the other electronics.