How to Build AMI Models for DDR5 Memory Interfaces

时间： 2021-07-12 来源：Keysight

技术问答

Traditionally, double data rate (DDR) technologies have relied on timing measurements, such as setup and hold times. As the standard evolves and the transfer rate increases, signal integrity becomes a lot more challenging.

For DDR5, timing measurements have been replaced with eye mask measurements for both data and command address signals. SPICE transient simulators are no longer the right approach for the latest DDR5 and LPDDR5 memory standards.

The new standards add equalization (EQ) on both the memory controller and the DRAM, and traditional simulation tools can't model at that complexity.

Figure 1. DDR5 standards add equalization (EQ) on both the memory controller and the DRAM.

Input/Output Buffer Information Specification (IBIS) Algorithmic Modeling Interface (AMI) – or IBIS-AMI – models support statistical and time-domain channel simulations and represent the processing behavior inside the chip accurately and efficiently. However, access to models can be a bottleneck for new design work.

To create fast and accurate models that can predict eye closure, here are three ways that an AMI model builder can help you with your DDR5 and LPDDR5 modeling.

1. Generate Models Based on Industry Standards

Advanced AMI model builder software helps you create a new AMI model or edit a pre-existing model using an intuitive, wizard-style interface built to meet JEDEC specifications for DDR5 and LPDDR5. This allows you to select the modeling options you need.

Figure 2. AMI model builder software with an intuitive, wizard-style interface built to meet JEDEC specifications for DDR5.

2. Predict Eye-Opening with Confidence

To ensure the signal's eye opens up, it is crucial that you apply the proper equalization. This includes finding the optimum decision feedback equalization (DFE) taps for your receiver equalization.

Figure 3. IBIS-AMI models with forwarded clocking capabilities better predict eye-opening measurement with simulation.

At DDR5 speeds, the data eye is expected to close. AMI model builder software can generate AMI models with forwarded clocking. This means it takes in both data and data strobe waveforms as input to the model.

This advanced modeling capability ensures that your simulations will handle both jitter tracking and skew adjustment, also known as unmatched IO.

3. Streamline Your AMI Workflow

Once you've completed setting up your IBIS-AMI model, you're now ready to send off your files. If you're using PathWave ADS Memory Designer, the AMI builder quickly generates 4 file types: .ami, .dll, .cfg., and .ibs, making the models easy to consume and use in your simulations.

Figure 4. PathWave ADS Memory Designer layout with the memory controller and DRAM.

If you are a memory system engineer or a silicon modeling engineer, you can quickly and easily generate IBIS-AMI models using the latest version of PathWave ADS.

发送到邮箱 |
+1 赞 0
收藏
评论 0
| 转发至：

全部评论（0）

暂无评论

【经验】基于是德科技PathWave SystemVue的IBIS AMI建模方案详解

目前市场上能提供AMI模型建立以及测试工具的厂商很少，是德科技的PathWave SystemVue以及PathWave ADS(Advanced Design System)是目前市场上被广泛采用的工具。

设计经验发布时间 : 2021-07-10

DDR5测试技术更新漫谈

近20多年来，经历了从SDRAM发展到DDR RAM，又从DDR发展到目前的DDR5，每一代 DDR 技术在带宽、性能和功耗等各个方面都实现了显著的进步，极大地推动了计算性能的提升。是德科技可以给大家带来完整的端到端解决方案。包括设计前期的仿真，涵盖了memory designer的建模和ADS的前后仿真。

设计经验发布时间 : 2024-04-24

Cut Down Design Time by Moving EM Simulations to the Cloud

As it applies to design simulation, HPC is a powerful tool. However, if you don’t currently have this existing infrastructure in place, HPC is complex to set up and costly to maintain. An effective alternative is to utilize Keysight Design Cloud, which is available with Keysight’s PathWave ADS.

设计经验发布时间 : 2023-07-05

DDR5和DDR4的区别是什么？谈谈DDR5测试方法

是德科技可以给大家带来完整的端到端解决方案。包括设计前期的仿真，涵盖了memory designer的建模和ADS的前后仿真。发送端测试中，我们提供业内旗舰级性能指标的UXR实时示波器和高性能的RC模型探头，有效降低测试负载。

技术探讨发布时间 : 2024-06-17

如何在ADS中进行通道仿真

为了解决这些问题我们就必须采用一些均衡（EQ）措施，或者采用编码等方法。此外，由于处理的数据量增加，瞬态仿真非常的耗时间，这样看来瞬态仿真就显得力不从心了。为了解决上述问题，Keysight推出了通道仿真解决方案，学习如何在ADS中进行通道仿真，以及通道方针所涉及的一些问题。

技术探讨发布时间 : 2024-06-09

【应用】Keysight Pathwave平台提供完整的DDR5仿真流程及解决方案

本文主要介绍了DDR技术的发展历程、 DDR5的出现带来了的设计挑战、如何通过仿真及建模中的创新克服DDR5技术挑战、以及是德科技Pathwave平台的SystemVueADS Memory Designer以及ADS SIPro提供的完整的DDR5仿真解决方案，最后还介绍了DDR5仿真实例。

应用方案发布时间 : 2020-03-11

如何实现高速DAC的信号完整性？

是德科技的PathWave ADS仿真软件，可以轻松仿真PCB串扰，结合是德科技的网络分析仪和PLTS软件进行串扰的测试，可以完成从概念设计、仿真、原型机设计、验证到生产制造和部署的全流程管理，从而加速产品开发流程。

技术探讨发布时间 : 2024-03-20

PathWave ADS Memory Designer DATA SHEET

型号- W3025E,W4810B,W3622B,W3024E,W3626B,W3033E

数据手册 - KEYSIGHT - November 25, 2020 PDF 英文下载

Keysight Introduces Chiplet PHY Designer for Simulating D2D to D2D PHY IP Supporting the UCIe™ Standard

Keysight Technologies, Inc. introduces Chiplet PHY Designer, the latest member in its family of high speed digital design and simulation tools that provides die-to-die (D2D) interconnect simulation, which is a key step in verifying performance for heterogeneous and 3D integrated circuit (IC) designs commonly referred to as chiplets.

产品发布时间 : 2024-01-30

What New Challenges Await High-Speed Digital Designers?

型号- W3621B

白皮书 - KEYSIGHT - February 9, 2023 PDF 英文下载

Keysight Delivers Design-to-Test Workflow for High-Speed Digital Designs with Rapid Simulation Times and Accurate Simulation and Modeling

Keysight Technologies announced PathWave Advanced Design System 2023 for high-speed digital (HSD) design with new Memory Designer capabilities for modeling and simulation of next-generation interface standards such as Double Data Rate 5 (DDR5).

原厂动态发布时间 : 2022-10-04

TDK Component Library for Keysight PathWave ADS

型号- SPM5020T-R68M-LR,MHQ1005P9N5HTD25,NLCV25T-6R8M-EFD,VLCF5024T-1R8N1R8-2,MLG1005SR39JTD25,MHQ0603P3N9STD25,C1005X6S,MHQ1005P1N5BT000,MLG0603P22NJT000,SPM10040T-2R2M,MMZ1005D221ETD25,MLG0603P2N2BTD25,C4532X5R1A107M280KC,MHQ0603P4N7CTD25,SPM5030T-R20M,MHQ1005P16NJT000,MPZ1608S600ATDH5,NLV25T-1R2J-EF,MLG1005S1N1CT000,MLG0402P30NJT000,MLG1005SR20JT000,MLG0603S1N2BT000,LTF4022T-1R2N-D,MLG0603P0N7CTD25,MLG0603P11NJTD25,C4532NP02E104J320KN,SLF12575T-100M5R4-H,SLF6025T-6R8M1R3-PF,MLG1005S43NJT000,NLV32T-150J-EF,MHQ0402PSA5N6JT000,VLS252012HBU-3R3M,C1005X5R,MMZ0603A121ET000,MLG0603S20NHTD25,TFM322512ALMA6R8MTAA,C1005X7R1H102K050BE,AVR-M2012C220KT6AB,C3216C0G2J101J060AA,C1005X7R1H102K050BA,C1005X5R1E103K050BA,MHQ0402PSA12NJT000,NLCV32T-3R3M-EF,VLCF4028T-150MR88-2,MLF2012DR22JTD25,MLG0402Q1N4BT000,MLF1005VR39KTD25,SPM6545VT-1R5M-D,MLG0603P4N7ST000,NLV25T-820J-EF,C0402X7R1A102K020BC,MLF1608DR47KTD25,MLG0603P16NJTD25,MLG0603S4N3STD25,MLF2012DR12MTD25,MHQ1005P0N8BT000,SLF12555T-102MR34-PF,MHQ1005P0N7CT000,MHQ1005P11NJT000,MLG0603S0N5BT000,MLG0603P1N5BTD25,C3225C0G2E103J160AA,SPM6550,MLF1608E5R6MTD25,NLV25T-4R7J-EFD,NLV32T-121J-EFD,MLF2012DR10JT000,CLF6045T-6R8N-D,MLG0603S0N4CT000,VLS252012CX-6R8M-1,SLF7045T-470MR90-H,MMZ2012S301AT000,SLF12565T-100M4R8-H,C1005X7R,MLG1005S3N3BT000,VLBU1007090T-R22L,C1608C0G1H100D080AA,MLG1005S1N0ST000,VLS201612CX_1,MHQ0402PSA3N8CT000,MLG0402Q2N1BT000,MLF1608DR22KTD25,SPM7054VT_D,MLG0603S36NHT000,MLG0603SR16HTD25,MHQ1005P51NJTD25,MLG0603P4N0ST000,MLZ2012N1R5LTD25,MLG0603S43NJT000,NLV25T-027J-EFD,C1005NP01H010C050BA,CLF7045NIT-330M-D,C3216C0G2A473J115AC,MLG1005SR27JT000,C3216C0G2A473J115AE,MHQ1005P1N4CT000,C1608X7R1C224K080AC,MLF2012A3R9JTD25,MLG1005S1N2BT000,SPM5030VT-1R0M-D,VLCF4024T-2R2N1R7-2,C1608NP01H102J080AA,MLG1005S20NHTD25,MHQ0603P2N5STD25,MLG0402Q0N6CT000,MHQ1005P3N9STD25,MMZ1608D050CTA00,CLF7045NIT-150M-D,MLG0603P10NHT000,C0603X5R1A224K030BB,MLG1005S16NHTD25,MLG0603P2N1CTD25,MLF1608A1R8KTD25,VLS201610HBX-R68M-1,MHQ0402PSA3N0ST000,C4532C0G2J822J160KA,MMZ2012Y300BT000,C3216NP01H333J085AA,MLF1608A1R2JTD25,VLB10050HT-R30N,VLS5045EX-100M-H,MHQ0402PSA3N9BT000,SLF12565T-680M2R0-H,MHQ0603P1N5BT000,VLS3012CX-150M-1,MPZ2012S601AT000,MMZ1608Y751BTD25,MLG1005S0N5BT000,NLV32T-056J-EFD,MLG0603P4N1CT000,VLCF5024T-100MR88-2,MLF1608A2R2MTA00,MLF2012A1R8JTD25,MLF1608D68NMTA00,MLF1608A3R3JTD25,VLS201610HBX-1R5M-1,MMZ1005D121CT000,MLG0603P1N4CTD25,MMZ1005F750ET000,VLS5045EX-2R2N-H,C1608X6S1A475K080AC,MHQ0603P3N2STD25,MLF1005VR27KT000,C4520C0G,C3216NP02A682J115AA,MMZ1608R471ATA00,MLG1005S4N3STD25,MLG0402Q1N3CT000,MLG0402P0N3CT000,SPM10040T-2R2M-HZ,MHQ0402PSA3N7ST000,MLF1005GR68KT000,MMZ0603S601HTD25,MHQ1005P47NJTD25,MLG1005SR16HTD25,MHQ0402PSA2N3ST000,MMZ1608F470BTA00,SLF12555T-101M1R1-PF,MHQ0603P4N1BTD25,MLG1005S36NHT000,MLF2012DR82MT000,C3225NP02E473J250AA,MHQ0603P11NJT000,MHQ1005PR13GTD25,MLG0603S1N0ST000,SPM10040XT,VLS252010HBU-4R7M,VLCF4024T-1R6N2R1-2,MHQ0603P0N8BT000,MLG0603S3N3BT000,C1005X6S0G475M050BC,MLG0603P2N8CTD25,MLF1005VR33JTD25,MLG1005SR22HT000,MLG0402Q3N5BT000,MMZ1005Y471CT000,MLP2012SR47TT0S1,MHQ1005P2N0ST000,MLG0603S27NHT000,MLG0603S16NHTD25,SLF10145T-471MR47-PF,MPZ1005A331ET000,MLG0402Q9N1JT000,MLG0603SR13JT000,NLV25T-390J-EF,MHQ1005P43NGTD25,C1608NP02A150J080AA,CLF6045NIT-471M-D,MLF1608DR15KTD25,MLG0603P2N0STD25,MHQ1005P4N3BT000,MLZ1608N100LTD25,MLG0603P7N5HT000,MLF1005G1R0KTD25,MHQ0603P3N4BTD25,VLBU9664100LT-R12L,C1608NP01H221J080AA,MHQ0603P2N1CT000,NLV32T-470J-EF,MLG0603P2N7STD25,MLG0603P3N3ST000,VLCF4020T-4R7N1R2,MLG0402P2N5BT000,VLS6045EX-151M-H,SPM5030VT-2R2M-D,MLG0603S82NHT000,MMZ0603D121CT000,MHQ1005P56NJTD25,MHQ0603P1N1STD25,MLG0603P2N7CT000,TFM201610ALMAR47MTAA,MHQ0603P20NJT000,NLV25T-3R3J-EFD,MLF1608DR18JT000,MHQ1005P3N2STD25,VLS201612CX-100M-1,MHQ0603P3N6BT000,MMZ0603S121ET000,MHQ0402PSA2N4CT000,VLCF4028T-2R2N1R9-2,MHQ0603P1N3ST000,MLF1608A3R9KTD25,C2012C0G2A272J125AA,SLF6045T-1R5N4R0-3PF,C3225C0G3A102J200AE,MLG0603P20NJTD25,MLG0402Q1N2ST000,MHQ0603P1N8STD25,NLV25T-056J-EF,C3225C0G3A102J200AC,MHQ0603P30NHTD25,VLS6045AF-220M,MMZ0603Y601CT000,MHQ0402PSA0N9ST000,SPM10040T-100M-HZ,CLF5030NIT-6R8N-D,LTF3020_D,MPZ1608S121ATAH0,VLBU9664100LT-R10L,VLS4012CX-1R0M-1,NLV32T-R18J-EFD,MLG1005S2N4ST000,SLF10145T-680M1R2-H,MMZ0603S471CT000,MHQ0603P3N3CTD25,MLP2520V2R2ST0S1,MLG0603P4N2CTD25,VLCF5020T-1R8N2R0,C3225C0G2E333J230AA,MHQ1005P62NJT000,MHQ0402PSA9N1JT000,NLV32T-5R6J-EF,SPM4010T-1R0M-LR,MLF1005,MMZ0603S601CT000,CLF12555T-1R5N-D,NLV32T-220J-EF,MLG0603S3N6STD25,NLCV25T-3R3M-EFR,SLF7055,MPZ1005S100CT000,MLG0402P0N9ST000,MLG0603P3N5BT000,SPM6530,MHQ1005P7N5GTD25,MLG0603P0N8BTD25,MHQ1005P2N7ST000,MLP2016,C2012C0G2W332J125AE,MLG1005S1N8CT000,MLP2012,C2012X6S1H475K125AC,TMS252012ALM-1R0MTAA,C2012C0G2W332J125AA,SPM3010_LR,MLG0402P0N4BT000,SPM7054VT-1R0M-D,MHQ0603P13NHT000,C1608NP02A471J080AA,MLF1608DR68JT000,MLF2012E120KTD25,NLV32T-391J-EF,C1608NP01H331J080AA,MMZ0603F750ET000,MLG0603P2N9BTD25,MHQ0603P0N7CT000,MHQ1005P2N9BT000,CLF7045NIT-101M-D,MHQ0603P16NJT000,MHQ1005PR12HTD25,MLG0603P1N9

物料清单 - TDK INVENSENSE - version 2022.07 - 2022.07 PDF 英文下载查看更多版本