AMI for DDR5 Made Easy
In a post last week, I covered IBIS and AMI. One big change that is happening is that the DDR5 standard will (indirectly) mandate using AMI models.
DDR5
In the DDR5 standard, which is expected to be published in summer 2018, DRAM will be specified to include DFE (decision feedback equalization) capability. Modeling DFE means, in practice, creating and using AMI models. In effect, the techniques used for the last decade or so to analyze serial links are being extended to parallel memory interfaces.
However, the nature of SerDes and DRAM means that there are some differences. Serial lines are often long and lossy. However, DRAM is shorter and less lossy. Low loss sounds like a good thing, and in some ways it is, but reflections remain bouncing around for a long time in a low-loss link, whereas reflections in longer serial links are rapidly attenuated due to the high loss. This is the motivation for using DFE, which squelches errors and addresses reflections. In SerDes there is one transmitter and one receiver. But systems like PCs and servers often have multiple DIMMs on the same bus, and sometimes unpopulated sockets, all of which make the reflection problem worse.
To read the full article, click here
Related Semiconductor IP
- DDR5 Controller - Ensures high-speed, efficient operation and compatibility of memory controllers
- Simulation VIP for DDR5 DIMM
- Simulation VIP for DDR5
- DDR5 IP solution
- DDR5 RDIMM Verification IP
Related Blogs
- SoC Debug Made Easy!
- HBM Performance Verification Made Easy
- what made Apple design the A4 processor?
- Abstract Made Concrete: Software Reverse Engineering – Mike McLean of UBM TechInsights Comments on the Bilski Case
Latest Blogs
- Rivos and Canonical partner to deliver scalable RISC-V solutions in Data Centers and enable an enterprise-grade Ubuntu experience across Rivos platforms
- ReRAM-Powered Edge AI: A Game-Changer for Energy Efficiency, Cost, and Security
- Ceva-XC21 and Ceva-XC23 DSPs: Advancing Wireless and Edge AI Processing
- Cadence Silicon Success of UCIe IP on Samsung Foundry’s 5nm Automotive Process
- Empowering your Embedded AI with 22FDX+