DDRDFI5.0version_ddr4dfispec资源-CSDN文库

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DDR DFI 5.0版本是DDR5和LPDDR5控制器与PHY（物理层）对接时使用的接口协议标准。DFI（Direct Memory Interface）是由DDR内存技术发展而来的一个接口规范，它允许控制器与PHY之间进行高效、直接的通信，以实现内存系统的高速数据传输和同步。DFI 5.0是在之前的版本基础上进行改进和扩展，以适应DDR5和LPDDR5内存标准的新需求。 DFI 5.0规范主要包含以下几个关键方面： 1. **接口信号**：DFI 5.0定义了一套完整的PHY接口信号，包括读写命令、地址、数据、时钟、控制信号等，这些信号用于控制器和PHY之间的数据传输和同步。例如，dfi_rdlvl_edge信号用于读取级别训练中的边缘检测。 2. **训练协议**：为了确保数据传输的准确性和可靠性，DFI 5.0包含了一系列的训练协议，如读写级别训练（read/write leveling）、数据眼训练（data eye training）等。这些训练协议有助于校准PHY和内存模块之间的延迟，确保数据在正确的时间被采样。 3. **低功耗控制**：随着LPDDR5内存的引入，DFI 5.0还增加了低功耗控制接口，支持内存系统在不同工作模式下的能效优化。dfi_data_byte_disable信号允许关闭某些数据通道以降低功耗。 4. **频率变化支持**：DFI 5.0引入了频率变更协议，允许内存系统在运行过程中动态调整工作频率。这涉及到信号trdlvl_load和twrlvl_load的时序参数，以及相应的时序图更新。 5. **状态接口**：DFI 5.0的状态接口提供关于内存系统的当前状态信息，包括DIMM（双列直插式内存模块）支持，使控制器能够监控内存系统的健康状况和性能。 6. **频率比率**：DFI 5.0详细定义了不同频率比率下的操作，以适应不同的系统配置。这包括了对1:4频率比率系统的时序图，以及向量读取数据的支持。 7. **错误检测和纠正**：DFI 5.0可能还涉及错误检测和纠正机制，如奇偶校验接口的更新，以提高数据完整性。 8. **版本历史**：从最初的2.0版本开始，DFI规范经历了多次迭代和更新，每次更新都针对DDR3、LPDDR2和LPDDR5等不同内存标准进行了优化和扩展。 DDR DFI 5.0协议是现代高性能和低功耗内存系统设计的关键组成部分，它确保了控制器和PHY之间的高效协同工作，从而实现了高速、稳定的数据传输。对于设计DDR5和LPDDR5内存系统的人来说，理解和掌握DFI 5.0规范至关重要。

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DDR PHY Interface, Version 5.0 1 of 160

Cadence Design Systems, Inc.

DFI

DDRPHYInterface

DFI 5.0 Specification

PRIL 27, 2018

2 of 160 DDR PHY Interface, Version 5.0

Cadence Design Systems, Inc.

Release Information

Rev # Date Change

1.0 30 Jan 2007 Initial Release

2.0 17 Jul 2007 Modifications/Additions for DDR3 Support

2.0 21 Nov 2007 Additional modifications/additions for DDR3 support. Added read and write leveling.

Changes approved by the Technical Committee for DDR3 support.

2.0 21 Dec 2007 Removed references to data eye training for PHY Evaluation mode, added a gate training-

specific mode signal, corrected references and clarified read training

2.0 11 Jan 2008 Modified wording; standardized notations in figures, clarified terminology for read and write

leveling.

2.0 26 Mar 2008 Added timing parameter t

rdlvl_en

and t

wrlvl_en

, signal dfi_rdlvl_edge.

2.1 2 Oct 2008 Added initial LPDDR2 support and corrected minor errors from 2.0 release.

2.1 24 Nov 2008 Added frequency change protocol, signal timing definitions, t

rdlvl_load

and t

wrlvl_load

timing

parameters and adjusted diagrams accordingly.

2.1 30 Jan 2009 Added DFI logo.

2.1 31 Mar 2009 Updated width of dfi_rdlvl_edge, corrected erroneous figures, updated t

rdlvl_en

and t

wrlvl_en

definitions.

2.1 20 May 2009 Added low power control interface, modified leveling request signal description to include

frequency change, added dfi_data_byte_disable signal and t

phy_wrdata

timing parameters.

Added DIMM support to the status interface and updated frequency ratios from an example to

a defined method. Updated frequency ratios information for new proposals, modified default

values and requirements for some training interface signals, incorporated LPDDR2 training

operations changes

2.1 22 Jun 2009 Expanded frequency ratio information to include vectored read data, expanded use of

dfi_init_start, added timing diagrams for 1:4 frequency ratio systems

2.1.1 23 Mar 2010 Added reference to the parity interface to the Overview. Changed dfi_parity_in signal to have

a phase index. Modified description of dfi_freq_ratio signal to make it optional except for

MCs/PHYs that support multiple frequency ratios. Expanded figure 32 into two figures to

represent odd and even timing parameters.

2.1.1 01 Apr 2010 Changed minimum value for t

lp_wakeup

2.1.1 20 Apr 2010 Corrected figure 3 timing violation. Corrected erroneous sentence for 2T timing. Corrected

figure 35 t

phy_wrlat

timing. Correct incorrect references to t

phy_wrlat

in frequency ratio read

examples.

2.1.1 27 May 2010 Added Figure 4 and text to explain differences between Figure 3 and 4.

2.1.1 09 Jun 2010 Modified text in dfi_init_start and surrounding figures 3 and 4 for more clarity.

3.0 21 May 2012 Added DDR4 DRAM support for: CRC, CA parity timing, CRC and CA parity errors, DBI,

leveling support, and CA modifications. Added DFI read data rotation clarification, read data

pointer resynchronization, independent timing of DFI read data valid per data slice, data path

chip select, error interface, and programmable parameters. Renamed PHY evaluation mode.

Removed MC evaluation mode and t

phy_wrdelay

timing parameter. Added support for refresh

during training, multiple CS training, enhancements to the update interface and the idle bus

definition

3.1 19 May 2012 Added support for LPDDR3. Enhanced the Low Power Control Interface to have separate

control and data requests. Added the PHY-Requested Training Interface to enable PHY-

independent training in non-DFI training mode.

-- 14 Nov 2013 Synchronized book files to 3.1 in advance of upcoming changes from JM.

DDR PHY Interface, Version 5.0 3 of 160

Cadence Design Systems, Inc.

-- 21 Nov 2013 Incorporated review corrections.

-- 21 Mar 2014 Incorporated committee comments, corrected erroneous cross references, fine-tuned

formatting, fine-tuned typographical items.

4.0 04 Aug 2017 Merged DFI 4.0 Spec Addendum to DFI 3.1. Added support for LPDDR4, DB training, per-

slice read leveling, DFI read/write chip select, write DQ training, PHY master interface,

frequency indicator, DFI disconnect protocol, DFI data bit disabling, slice parameter,

geardown mode, DFI feature and matrix topology matrix, 3D stack support and inactive CS

support. Also modified CA training, write leveling strobe and changed the DFI training to be

optional. Enhanced DFI read data eye training sequence, update interface for self-refresh exit

20 Jul 2017 Incorporated review changes from 4.0 Addendum merge.

Proprietary Notice

No part of this document may be copied or reproduced in any form or by any means without prior written consent of

Cadence.

Cadence makes no warranties with respect to this documentation and disclaims any implied warranties of

merchantability or fitness for a particular purpose. Information in this document is subject to change without notice.

Cadence assumes no responsibility for any errors that may appear in this document.

Except as may be explicitly set forth in such agreement, Cadence does not make, and expressly disclaims, any

representations or warranties as to the completeness, accuracy, or usefulness of the information contained in this

document. Cadence does not warrant that use of such information will not infringe any third party rights, nor does

Cadence assume any liability for damages or costs of any kind that may result from use of such information.

RESTRICTED RIGHTS LEGEND

Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subparagraphs (c)(1)(ii) of the

Rights in Technical Data and Computer Software clause at DFARS 252.227-7013.

Destination Control Statement

All technical data contained in this product is subject to the export control laws of the United States of America.

Disclosure to nationals of other countries contrary to United States law is prohibited. It is the reader's responsibility to

determine the applicable regulations and to comply with them.

Trademarks

Cadence and the Cadence logo are registered trademarks of Cadence Design Systems, Inc.

All other products or brand names mentioned are trademarks or registered trademarks of their respective holders.

End User License Agreement2

1.Subject to the provisions of Clauses 2, 3, 4, 5 and 6, Cadence hereby grants to licensee ("Licensee") a perpetual,

nonexclusive, nontransferable, royalty free, worldwide copyright license to use and copy the DFI (DDR PHY Interface)

specification (the "DFI Specification") for the purpose of developing, having developed, manufacturing, having

manufactured, offering to sell, selling, supplying or otherwise distributing products which comply with the DFI

Specification.

2.THE DFI SPECIFICATION IS PROVIDED "AS IS" WITH NO WARRANTIES EXPRESS, IMPLIED OR

STATUTORY, INCLUDING BUT NOT LIMITED TO ANY WARRANTY OF SATISFACTORY QUALITY,

MERCHANTABILITY, NONINFRINGEMENT OR FITNESS FOR A PARTICULAR PURPOSE.

3.No license, express, implied or otherwise, is granted to Licensee, under the provisions of Clause 1, to use Cadence's or

any other person or entity participating in the development of the DFI Specification listed herein (individually

DDR PHY Interface, Version 5.0 5 of 160

Cadence Design Systems, Inc.

Contents

1.0 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.0 Architecture. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.1 Clocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.2 Optional Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2.3 DFI Feature Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2.3.1 Global Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2.3.2 Memory Topology-Specific Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2.3.3 DFI Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

2.4 Definition of a Slice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

3.0 Interface Signal Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

3.1 Command Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

3.1.1 Mapping the CA Bus to the dfi_address Bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

3.1.2 Clock Disabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

3.1.3 Frequency Ratio Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

3.1.4 CRC and CA Parity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

3.2 Write Data Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

3.2.1 Write Data Mask/Write DBI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

3.2.2 Write Data Chip Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

3.2.3 Write Data CRC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

3.2.4 Frequency Ratio. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

3.2.5 Write Data Signals and Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

3.3 Read Data Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

3.3.1 Read DBI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

3.3.2 Read Data Chip Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

3.3.3 Read Data Valid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

3.3.4 Frequency Ratio. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

3.3.5 Read Data Signals and Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

剩余159页未读，继续阅读

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2023-07-25

：该文件的设计简洁明了，使用起来非常方便。
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