Ddr4 interface design pdf

Am65xdra80xm ddr board design and layout guidelines rev. Specified condition of wiring layer l1 and l8 are used as wiring and pullout wiring layer of clk. Ddr sdram technology has reached its 4th generation. Hi, i have a xilinx ml605 board and was able to interface ddr3 sodimm with it. This parameter will be characterized and guaranteed by design. The past, present and future of ddr4 memory interfaces. Youll have the ability to filter down to specific performances based on your search specifications, and then compare performances across fpgas sidebyside by filtering the. Consecutive data phases in single burst designed for cpu cacheline fill multiple banks per device. Data transfer rates for ddr4 and ddr3 should overlap for the foreseeable future, with ddr4 delivering a longer performance runway. The past, present and future of ddr4 memory interfaces the latest ddr4 sdram memory standard offers significant performance benefits for soc designers. Pcb laminating this chapter shows the recommended laminating conditions of the pcb. Refer to the device data manual for supported data rates. Hardware and layout design considerations for ddr3 sdram memory interfaces, rev. Hardware and layout design considerations for ddr2 sdram memory interfaces, rev.

This chapter shows the recommended laminating conditions of the pcb. Developed for and available early in the life cycle of the most advanced semiconductor process nodes, the ddr phy ip is designed to be robust under varying noise conditions and to have interoperability with various. It requires every engineer working on soc to be well versed with ddr protocol concepts including ddr controller, ddr phy, ddr memory, etc. Manual delay tuning can also lead to adding extra length to entire group even. Module for compatibility with standard ddr memory interfaces. Understanding xilinx mig example design for ddr4 access. Ddr2, ddr3, and ddr4 sdram board design 4 guidelines 2014. This stateoftheart tuning acts independently on each pin, data. Pod relies on switchable, ondie termination instead of a separate resistor pull up. Jul 23, 2014 the ddr4 sdram interface achieves a maximum data rate of 3. Ddr4 is the current cutting edge memory standard developed by jedec. External memory interfaces intel stratix 10 fpga ip. This interface was standardized in order to allow different rf equipment to talk to the same baseband modem card. There are four key challenges in designing the placement and routing of ddr4 sdram interface with.

Due to the relatively high acceptance rate of ddr in a growing variety of digital designs, the remainder of this article will focus on ddr memory, and implementation of the ddr interface within an fpga. If the ip catalog window is not visible, select view utility windows ip catalog. Interface speed ddr2 up to 800 mhz ddr3 up to 800 mhz today mpc8572, mpc8526 evaluating higher speeds 1066 mhz and up to 1600 mhz support interface width 6472bit data bus high end product 3240bit data bus low end products 1624bit data bus low end products discrete, unbuffered, and registered dimm support. Tps51116 complete ddr, ddr2, ddr3, ddr3l, lpddr3 and. A ddr4 nvdimmn is a hybrid memory module with a ddr4 dimm interface consisting of dram that is made nonvolatile through the use of nand flash. Presentation provides both a starter introduction to what dram is and how it operates and also what are various critical. Ddr4 is not compatible with any earlier type of randomaccess memory ram due to different signaling voltage and physical interface, besides other factors. The ddr phy ip is developed and validated to reduce risk for the customer so that their soc will work right the first time. Changed io buffer interface from midpoint terminated sstl to vdd terminated. The ddr memory controller consists of more than signals and provides a glueless interface for the memory subsystem.

Ddr4s new memory interface employs pseudoopendrain pod termination where memory cells can store a logical 1 without consuming power. Data bus inversion dbi in ddr4 interface the data bus inversion scheme in ddr4 is classified as the dc dbi. Xilinx answer 60305 mig ultrascale ddr4ddr3 hardware debug. The synopsys designware ddr43 phy is a complete physical layer ip interface phy solution for enterpriseclass asic, assp, and systemonchip soc applications requiring highperformance ddr4ddr3ddr3l sdram interfaces operating at up to 3200 mbps. Mb86r12 application note ddr3 interface pcb design. The course focus on teaching ddr3, ddr4, timing diagrams, training sequence, ddr controller design concepts and ddrphy concepts. Assuming worstcase parameters and that the class ii termination scheme of figure 1 is used, the power dissipation for these resistors is as. Design of ddr4 sdram controller request pdf researchgate. Provide an overview of ddr4 memory interfaces including topologies and. Clocks data addresscommand control feedback signals table 1 depicts signal groupings for the ddr interface.

It is important to note that answer records are webbased content that are frequently updated as new information becomes available. Ddr4 interface is compatible with all jedeccompliant ddr4 sdram devices in x8 or x16 widths. Each channel provides a 128bit data interface data rate of 1 to 2 gbps per signal 500 mhz ddr 1632 gbsec of bandwidth per channel 8 channels per stack 128256 gbsec of bandwidth per stack for comparison. System design verification and optimization of modern. It is quite conceivable for a ddr4 platform to deliver moderate power savings versus a comparable ddr3 design, but potentially at the expense of lower memory bandwidth under certain ddr4 operating parameters. Highlights of the high bandwidth memory hbm standard. Double datarate ddr memory has ruled the roost as the main system memory in pcs for a long time. Ddr is an essential component of every complex soc. The fs2510ab is used to design and debug computer motherboards and dimms logic analyzer. The highbandwidth interface is used as a communication link between a memory controller operating at 400mhz and a ddr4 sdram. Mb86r12 application note ddr3 interface pcb design guideline. Second, i recommend you try out the example design simulation. Usually, i perform various kind of dram test exploring timing characteristics, the effect of small temperaturevoltage variation, etc. Hardware and layout design considerations for ddr2 sdram.

All signals are probed passively, which allows for the least. The example design instantiates a traffic generator and it is pretty easy to follow along with what its doing and see what the user interface cycles look like. In the ip catalog window, select intel stratix 10 external memory interfaces. It covers a wide variety of topics such as understanding the basics of ddr4, sytemverilog language constructs, uvm, formal verification, signal integrity and physical design.

Pcb west 2016 routing ddr4 interfaces quickly and efficiently simply jumping into routing or turning on auto router after completing placement was never an efficient way of getting a design completed. Ultrascale ddr4 sdram mig native vs axi4 community forums. System performance and field reliability demand that the ddr subsystem implementation offer the highest performance while at the same time offering the highest quality, in combination with a small footprint and minimal power consumption. These signals can be divided into the following signal groups for the purpose of this design guide. However, when i use the same ip core in block design the only supported interface is axi4.

At this time, ti does not provide timing parameters for the processors ddr phy interface. Increasing design complexities with advanced interfaces like xfi, xgmii, xaui. This addendum was created based on the jesd794 ddr4 sdram specification. Of late, its seeing more usage in embedded systems as well. Nvdimmn modules adhere to the byte addressable energy backed interface standard, jesd245, that provides detailed logical behavior, interface, and register definitions. For all systems, the memory interface design is one of the key elements to get right. Ddr interface design implementation until now we have discussed various memory architectures and where they fit within the system. Ultrascale architecture fpgas memory ip product guide. Facilitates pipelining, different banks may be in different phases of rowcycle operation ddr3, gddr5, lpddr2 all direct evolutionary. Layout guidelines for ddr3 and ddr4 sdram interfaces. This je dec specification, new to the dram family, is a proven interface specification used by. Jesd21c jesd21c, jedec configurations for solid state memories, is a compilation of some 3000 pages of all memory device standards for solid state memory including dimm, dram, sdram, mcp, prom, and others from september 1989 to present. Pdf design and implementation of sdram controller in fpgas.

Hello, the documentation of the ultrascales ddr4 memory interface mentions a native interface. There are four key challenges in designing the placement and routing of ddr4 sdram interface with multigigabit transmission. As memory interface performance increases, board designers must pay closer attention to the quality of the signal seen at the receiver because. Xilinx answer 60305 mig ultrascale ddr4ddr3 hardware debug guide important note. Hardware and layout design considerations for ddr memory interfaces, rev. Ddr2, ddr3, and ddr4 sdram board design guidelines 4. Introduction to ddr4 design and test teledyne lecroy.

Email julie carlson for other assistance, including website or account help, contact jedec by email here. D cadence design systems memcon 2015 how to efficiently analyze a ddr4 interface. Mb86r11 application note ddr3 interface pcb design guideline. Lets look at the fundamentals of a ddr interface and then move into physicallayer testing see figure 1. A virtual reference design based on the cadence ddr4 ip test chip. Figure 7 ddr4 dram unit relative power distribution no dbi 3. Mb86r11 application note ddr3 interface pcb design. An3940, hardware and layout design considerations for. Tps51116 complete ddr, ddr2, ddr3, ddr3l, lpddr3 and ddr4 power solution synchronous buck controller, 3a ldo, buffered reference 1 1 features 1 synchronous buck controller vddq wideinput voltage range.

The xilinx ddr4 core can generate a full controller or phy only for custom controller needs. Our team developed a physical interface that can transmit 3. Refer to microns 8gb ddr4 sdram data sheet x8 option for the specifications not included in this document. Cap mode with 100ns load step response current mode option supports ceramic output capacitors. Dbi in ddr4 will further improve the total system power and the concept is explained in the following section. The 8n prefetch architecture is combined with an interface designed to transfer two. Creating a memory interface design using vivado mig.

The recommended routing order within the ddr4 interface is as follows. Some product implementations may support only the singleended version of the strobe. The user interface, and timing diagrams, are located in the protocol description section of pg150, page 120 in pg150 v1. L3 and l6 are used as wiring layer of dqs, dq, and cmdadd. This downloadable pdf of an answer record is provided to enhance its usability and readability. Jun 30, 2011 high level introduction to sdram technology and ddr interface technology. Hardware and layout design considerations for ddr memory. The other main interface on the wireless modem chip is the common public radio interface cpri, which is designed exclusively for the antenna data. The controller will support data widths from 8b to 80b and multiple memory types including components, udimm, sodimm. It was hoped that this would reduce the cost and increase flexibility in the network. This stateoftheart tuning acts independently on each pin, data phase and chip select value. Mb86r11 application note ddr3 interface pcb design guideline 2. Similar signals as mono x16, there is one extra zq connection for faster zq calibration and a bg1 control required for x8 addressing. Routing ddr4 interfaces quickly and efficiently cadence.

Figure 21 pcb laminating specified condition of wiring layer l1 and l8 are used as wiring and pullout wiring layer of clk. Am65xdra80xm ddr board design and layout guidelines. External memory interface intel data center solutions. Presentation provides both a starter introduction to what dram is and how it operat. Email julie carlson for other assistance, including. Is the axi4 just a wrapper and under the hood theres axi4 to native glue logic. Design guidelines updated for intel quartus prime design suite. The controller is configurable through the ip catalog. The external memory interface spec estimator, a parametric tool, allows you to find and compare the performance of the supported external memory interfaces in our fpgas. The purpose of this specification is to define the minimum set of requirements for a compliant 8 gbit through 128 gbit for x4, x8 3ds ddr4 sdram devices. Request pdf design of ddr4 sdram controller currently, the demand of. Other ddr4 attributes tightly intertwined with the planned speed grades, enabling device functionality as well as application adoption, include.

Sdram controller design, located between the sdram and the bus master which reduces the users effort to deal with the sdram command interface by providing a simple generic system interface to. This is often the highest density routing on the board. Graham allan, senior product marketing manager for ddr at synopsys, discusses some of the challenges that design teams face in making the change from ddr3. A representative test setup for physicallayer ddr testing a ddr interface entails each dram chip transferring data. This memory device provides higher reliability, availability and serviceability than other ddr memories. Complete ddr ip subsystem solution the ddr memory subsystem ddr controller, phy and io is critical to the successful operation of a soc.