IHI0068C_low_power_interface_spec.pdfarm amba总线协议，

文件名称: IHI0068C_low_power_interface_spec.pdf

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详细说明：arm amba总线协议，在移动终端、低功耗领域都离不开arm总线协议。FITNESS FOR A PARTICULAR PURPOSE OR THAT ANY USE OR IMPLEMENTATION OF SUCH ARM TECHNOLOGY WILL NOT INFRINGE ANY THIRD PARTY PATENTS. COPY RIGHTS TRADE SECRETS OR OTHER INTELLECTUAL PROPERTY RIGHTS NOTWITHSTANDING ANYTHING TO THE CONTRARY CONTAINED IN THIS AGREEMENT TO THE FULLEST EXTENT PERMITTED BY LAW THE MAXIMUMM LIABILITY OF ARM IN AGGREGATE FOR ALI CLAIMS MADE AGAINST ARM. IN CONTRACT. TORT OR OTHERWISE. IN CONNECTION WITH THE SUBJECT MATTER OF THIS AGREEMENT (INCLUDING WITHOUT LIMITATION ()LICENSEE S USE OF THE RELEVANT LOW POWER INTERFACE SPECIFICATION; AND (II)THE IMPLEMENTATION OF THE RELEVANT LOW POWER INTERFACE SPECIFICATION IN ANY PRODUCT CREATED BY LICENSEE UNDER THIS AGREEMENT) SHALL NOT EXCEED THE FEES PAID (IF ANY BY LICENSEE TO ARM UNDER THIS AGREEMENT. THE EXISTENCE OF MORE THAN ONE CLAIM OR SUIT WILL NOT ENLARGE OR EXTEND THE LIMIT LICENSEE RELEASES ARM FROM ALL OBLIGATIONS. LIABILITY CLAIMS OR DEMANDS IN EXCESS OF THIS LIMITATION 6. No liccncc, cxprcss, implied or otherwise, is granted to LICENSEE, undcr thc provisions of Clausc I, to usc the arm tradename in connection with the relevant Low Power Interface Specification or any products based thereon. Nothing in Clausc I shall bc construed as authority for licensee to makc any representations on bchalf of arM in rcspcct of the relevant Low Power Interface Specification 7. This Licence shall remain in force until terminated by you or by arM. without prejudice to any of its other rights if LICENSEE is in breach of any of the terms and conditions of this Licence then ARM may terminate this licence immediately upon giving written notice to You. You may terminate this Licence at any time. Upon expiry or termination of this licence by You or by ARM LICEnSEE shall stop using the rclcvant Low Powcr Intcrfacc Spccification and destroy all copies of the relevant Low Puwer Interface Specification in your possession together with all documenta tion and relaled materials. Upon expiry or termination of this Licence, the provisions of clauses 6 and 7 shall survive 8. The validity, construction and performance of this agreement shall be governed by English Law aRM contract rcfcrenccs: LES-PRE-20414 ARM LOW POWER INTERFACE SPECIFICATION LICENCE In this document, where the term ARM is used to refer to the company it means "ARM or any of its subsidiaries as appropriate Web ddress http://ww.arm.com ARM IHI 0068C Copyright 2013, 2014, 2016 ARM Limited or its affiliates. A rights reserved lIl D091216 Non-Confidential Copyright O 2013, 2014, 2016 ARM Limited or its affiliates. All rights reserved ARM IHI 0068C D091216 Contents AMBA Low Power Interface Specification ARM Q-Channel and P-Channel Interfaces Chapter 1 Introduction About the low-power interfaces 1-8 Interface differences and selection 19 Chapter 2 Interface Specification Q-Channel interface specification 2-12 2.2 P-Channel interface specification 2-19 Chapter 3 Implementation Guidelines Q-Channel implementation 3.2 P-Channel implementation..... 3-3 Chapter 4 Application Examples 1 Q-Channel application examples 4.2 P-Channel application examples 4-37 Chapter 5 Q-Channel Backward Compatibility Q-Channel backwards compatibility 5-42 Appendix A Revisions ARM IHI 0068C Copyright 2013, 2014, 2016 ARM Limited or its affiliates. A rights reserved D091216 Non-Confidential Copyright O 2013, 2014, 2016 ARM Limited or its affiliates. All rights reserved ARM IHI 0068C D091216 Chapter 1 Introduction The following sections introduce the low-power interfaces, and describe the differences between them About the low-power interfaces on pagc 1-8 Interface differences and selection on page 1-9 ARM|H|0068 Copyright O 2013, 2014, 2016 ARM Limited or its affiliates. All rights reserved 1-7 D091216 Non-Confidential 1 Introductian 1. 1 About the low-power interfaces 1.1 About the low-power interfaces This document dcscribcs interfaces that can bc uscd to control the clock and powcr statcs of dcviccs. Thc interfaces Q-Channel Intended for use where simple run-stop quiescence semantics are suitable. Q-Channel is an cvolution of thc AXI low-powcr intcrfacc, and its naming reflects the fact that the purposc of thc interface is the control of device quiescence P-Channel Intended for management of complex power scenarios with multiple transitions. These transitions can be made without returning the device to a able state. Its nar eflects the fact that the purpose of the interface is the control of power state transitions 1.1.1 Common characteristics Thc Q-Channcl and P-Channcl interfaces havc the following common charactcristics Controller-managed transitions between device states a device can Indicate that it must exit a lo state and enter a higher-functioning Hint that it might accept a request to enter a lower-power state Optionally, a devicc can dcny a statc changc rcqucst Clock domain crossing semantics are robust, to support asynchronous interfacing There arc no restrictions on the spccific charactcristics of the states that the interfaces manage 18 Copyright O 2013. 2014, 2016 ARM Limited or its affiliates. All rights reserved ARM IHI 0068C Non-Confidential ID091216 1 introduction 1.2/nterface differences and selection 1.2 Interface differences and selection ARM intends the two interfaces to complement cach othcr, and that the interfaces arc uscd as circumstanccs dictate The simple run-stop quiescence semantics of Q-Channel are ideal for clock control or simple power contro scenarios. Thc quiescent statc cntcrcd can vary, but only according to thc common configuration of both the devicc and controller before entering the quiescent state. The quiescent state exit transition is always to a common operable running state. This must be entered before the device can enter a different quiescent state P-Channel can handle more complex scenarios. Multiple transitions can be made without returning the device,or device partition, to a common operable state between successive power-saving states. The controller provides an explicit state request at each transition, so common configuration of the controller and device is not needed Typically, each P-Channel maps directly from a controller to the management of a power domain partition of a singlc devicc. The P-Channcl interface is uscd only if Q-Channcl functionality is insufficient. ARM|H|0068 Copyright O 2013. 2014, 2016 ARM Limited or its affiliates. All rights reserved 19 D091216 Non-Confidential 1 Introductio 1.2 Interface differences and selection 1-10 Copyright O 2013, 2014, 2016 ARM Limited or its affiliates. All rights reserved ARM IHI 0068C Non-Confidential ID091216

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