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Method, apparatus, and system for semaphore-based protection of power-domain-crossing signals

A semaphore, power domain technology, applied in the field of signal integrity, can solve problems such as increasing complexity, and achieve the effect of reducing the possibility of false release

Active Publication Date: 2019-12-06
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this involves added complexity since the isolation unit is activated by a control circuit that remains powered on during a power dip in the source domain and must be able to determine that a power dip is imminent

Method used

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  • Method, apparatus, and system for semaphore-based protection of power-domain-crossing signals
  • Method, apparatus, and system for semaphore-based protection of power-domain-crossing signals
  • Method, apparatus, and system for semaphore-based protection of power-domain-crossing signals

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Embodiment Construction

[0017] Aspects of the inventive teachings herein are disclosed in the following description and in the associated drawings directed to certain aspects. Alternative aspects may be devised without departing from the scope of the inventive concepts herein. Additionally, well-known elements of the environment may not be described in detail or may be omitted so as not to obscure the relevant details of the inventive teachings herein.

[0018] The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any aspect described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other aspects. Likewise, the term "aspects of the invention" does not require that all aspects of the invention include the discussed feature, advantage or mode of operation.

[0019] The terminology used herein is for the purpose of describing particular aspects only and is not intended to limit the aspects of the invention. As used he...

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Abstract

In certain aspects of the disclosure, an apparatus includes first and second semaphore registers disposed in a first power domain. A common address bus is coupled to the first and second semaphore registers, and a semaphore lock is disposed in the first power domain and coupled to the first and second semaphore registers. The semaphore lock is controlled by the first and second semaphore registers, and controls whether a signal from a second power domain is permitted to propagate to the first power domain. The first and second semaphore registers may be associated with first and second register addresses, respectively, which are selected to provide a substantially maximized Hamming distance between them. The first and second semaphore registers may have a write order expectation enforced between them.

Description

[0001] priority statement [0002] This patent application claims priority to Application No. 15 / 499,247, filed April 27, 2017, entitled "METHOD, APPARATUS, AND SYSTEMFOR SEMAPHORE-BASED PROTECTION OF POWER-DOMAIN-CROSSING SIGNALS," assigned to its recipient is hereby expressly incorporated by reference. technical field [0003] Aspects of the present disclosure relate generally to signal integrity, and more specifically to protecting signals across power domains from corruption due to power loss. Background technique [0004] An integrated circuit may include multiple power domains, where each power domain may be powered by a separate supply rail. Having multiple power domains allows circuits in different power domains to be powered with different supply voltages and allows power domains to be powered collapsed independently so that one power domain can be powered while another power domain is power collapsed . However, power dipping the source power domain means that t...

Claims

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Application Information

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IPC IPC(8): G06F9/52G06F1/32G06F13/40
CPCG06F1/3287G06F9/52G06F13/362G06F13/4068Y02D10/00
Inventor M·K·巴滕伯格V·P·勒罗伊P·K·奥里甘蒂
Owner QUALCOMM INC
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