Hardware and layout design considerations for ddr memory. Ddr4 networking design guide micron technology, inc. The ddr4 sdram interface achieves a maximum data rate of 3. Hardware and layout design considerations for ddr3 sdram memory interfaces, rev.
Presentation provides both a starter introduction to what dram is and how it operates and also what are various critical. Complete ddr ip subsystem solution the ddr memory subsystem ddr controller, phy and io is critical to the successful operation of a soc. There are four key challenges in designing the placement and routing of ddr4 sdram interface with multigigabit transmission. Ddr2, ddr3, and ddr4 sdram board design guidelines 4. Mb86r11 application note ddr3 interface pcb design guideline 2. It is important to note that answer records are webbased content that are frequently updated as new information becomes available. 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.
Understanding xilinx mig example design for ddr4 access. Similar signals as mono x16, there is one extra zq connection for faster zq calibration and a bg1 control required for x8 addressing. Our team developed a physical interface that can transmit 3. 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. 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. 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. Ddr2, ddr3, and ddr4 sdram board design 4 guidelines 2014.
Creating a memory interface design using vivado mig. An5097, hardware and layout design considerations for ddr4. Increasing design complexities with advanced interfaces like xfi, xgmii, xaui. This interface was standardized in order to allow different rf equipment to talk to the same baseband modem card. The other main interface on the wireless modem chip is the common public radio interface cpri, which is designed exclusively for the antenna data. Am65xdra80xm ddr board design and layout guidelines rev. 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. Design of ddr4 sdram controller request pdf researchgate. Refer to microns 8gb ddr4 sdram data sheet x8 option for the specifications not included in this document. Email julie carlson for other assistance, including website or account help, contact jedec by email here. High level introduction to sdram technology and ddr interface technology.
The course focus on teaching ddr3, ddr4, timing diagrams, training sequence, ddr controller design concepts and ddrphy concepts. Hardware and layout design considerations for ddr2 sdram memory interfaces, rev. Data bus inversion dbi in ddr4 interface the data bus inversion scheme in ddr4 is classified as the dc dbi. Figure 7 ddr4 dram unit relative power distribution no dbi 3. L3 and l6 are used as wiring layer of dqs, dq, and cmdadd. Ddr4 interface is compatible with all jedeccompliant ddr4 sdram devices in x8 or x16 widths. 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.
The past, present and future of ddr4 memory interfaces. In the ip parameter editor, provide an entity name for the emif ip the name. Specified condition of wiring layer l1 and l8 are used as wiring and pullout wiring layer of clk. The 8n prefetch architecture is combined with an interface designed to transfer two. Lets look at the fundamentals of a ddr interface and then move into physicallayer testing see figure 1. 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. This chapter shows the recommended laminating conditions of the pcb. D cadence design systems memcon 2015 how to efficiently analyze a ddr4 interface.
This is often the highest density routing on the board. Hardware and layout design considerations for ddr2 sdram. Match all segment lengths between differential pairs along the entire length of the pair. For all systems, the memory interface design is one of the key elements to get right. Ddr is an essential component of every complex soc. Some product implementations may support only the singleended version of the strobe. Ultrascale ddr4 sdram mig native vs axi4 community forums. Other ddr4 attributes tightly intertwined with the planned speed grades, enabling device functionality as well as application adoption, include. 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. Mb86r11 application note ddr3 interface pcb design guideline. Double datarate ddr memory has ruled the roost as the main system memory in pcs for a long time.
Highlights of the high bandwidth memory hbm standard. Ddr4 sdram was released to the public market in q2 2014, focusing on ecc memory, while the nonecc ddr4 modules became available in q3 2014, accompanying the launch of haswelle processors. A representative test setup for physicallayer ddr testing a ddr interface entails each dram chip transferring data. Usually, i perform various kind of dram test exploring timing characteristics, the effect of small temperaturevoltage variation, etc. These signals can be divided into the following signal groups for the purpose of this design guide. The controller is configurable through the ip catalog. If the ip catalog window is not visible, select view utility windows ip catalog. Presentation provides both a starter introduction to what dram is and how it operat.
Mb86r11 application note ddr3 interface pcb design. This downloadable pdf of an answer record is provided to enhance its usability and readability. It was hoped that this would reduce the cost and increase flexibility in the network. Jun 30, 2011 high level introduction to sdram technology and ddr interface technology. The highbandwidth interface is used as a communication link between a memory controller operating at 400mhz and a ddr4 sdram. 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. Am65xdra80xm ddr board design and layout guidelines. Second, i recommend you try out the example design simulation. Request pdf design of ddr4 sdram controller currently, the demand of. This addendum was created based on the jesd794 ddr4 sdram specification. The recommended routing order within the ddr4 interface is as follows.
Introduction to ddr4 design and test teledyne lecroy. Nvdimmn modules adhere to the byte addressable energy backed interface standard, jesd245, that provides detailed logical behavior, interface, and register definitions. Ultrascale architecture fpgas memory ip product guide. Pdf design and implementation of sdram controller in fpgas. Consecutive data phases in single burst designed for cpu cacheline fill multiple banks per device. Cap mode with 100ns load step response current mode option supports ceramic output capacitors. Ddr2, ddr3, and ddr4 sdram board design guidelines.
Figure 21 pcb laminating specified condition of wiring layer l1 and l8 are used as wiring and pullout wiring layer of clk. 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. External memory interfaces intel stratix 10 fpga ip. Is it possible to interface ddr4 memory with this board for the same purpose. Tps51116 complete ddr, ddr2, ddr3, ddr3l, lpddr3 and. Layout guidelines for ddr3 and ddr4 sdram interfaces. An3940, hardware and layout design considerations for. Refer to the device data manual for supported data rates. 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.
Ddr interface design implementation until now we have discussed various memory architectures and where they fit within the system. This parameter will be characterized and guaranteed by design. 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. Is the axi4 just a wrapper and under the hood theres axi4 to native glue logic. The past, present and future of ddr4 memory interfaces the latest ddr4 sdram memory standard offers significant performance benefits for soc designers. The ddr phy ip is developed and validated to reduce risk for the customer so that their soc will work right the first time. Xilinx answer 60305 mig ultrascale ddr4ddr3 hardware debug guide important note. Ddr 43 phy the tci ddr phy is a highperformance, scalable system using a radically new architecture that continuously and automatically adjusts each pin individually, correcting skew within byte lanes. The user interface, and timing diagrams, are located in the protocol description section of pg150, page 120 in pg150 v1. Pcb laminating this chapter shows the recommended laminating conditions of the pcb. Assuming worstcase parameters and that the class ii termination scheme of figure 1 is used, the power dissipation for these resistors is as. Jul 23, 2014 the ddr4 sdram interface achieves a maximum data rate of 3. Routing ddr4 interfaces quickly and efficiently cadence.
Design guidelines updated for intel quartus prime design suite. 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. System design verification and optimization of modern. There are four key challenges in designing the placement and routing of ddr4 sdram interface with. The controller will support data widths from 8b to 80b and multiple memory types including components, udimm, sodimm. Clocks data addresscommand control feedback signals table 1 depicts signal groupings for the ddr interface. Of late, its seeing more usage in embedded systems as well.
The xilinx ddr4 core can generate a full controller or phy only for custom controller needs. Mb86r12 application note ddr3 interface pcb design. Manual delay tuning can also lead to adding extra length to entire group even. Each aspect of the changes for 3ds ddr4 sdram operation was considered. This je dec specification, new to the dram family, is a proven interface specification used by. Hi, i have a xilinx ml605 board and was able to interface ddr3 sodimm with it. The ddr memory controller consists of more than signals and provides a glueless interface for the memory subsystem. 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. Data transfer rates for ddr4 and ddr3 should overlap for the foreseeable future, with ddr4 delivering a longer performance runway. Ddr sdram technology has reached its 4th generation. Ddr4 is not compatible with any earlier type of randomaccess memory ram due to different signaling voltage and physical interface, besides other factors.
Hello, the documentation of the ultrascales ddr4 memory interface mentions a native interface. However, when i use the same ip core in block design the only supported interface is axi4. This stateoftheart tuning acts independently on each pin, data phase and chip select value. A virtual reference design based on the cadence ddr4 ip test chip. Changed io buffer interface from midpoint terminated sstl to vdd terminated. Facilitates pipelining, different banks may be in different phases of rowcycle operation ddr3, gddr5, lpddr2 all direct evolutionary.
At this time, ti does not provide timing parameters for the processors ddr phy interface. Hardware and layout design considerations for ddr memory interfaces, rev. The fs2510ab is used to design and debug computer motherboards and dimms logic analyzer. Module for compatibility with standard ddr memory interfaces. 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. Provide an overview of ddr4 memory interfaces including topologies and. 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. Pod relies on switchable, ondie termination instead of a separate resistor pull up. Xilinx answer 60305 mig ultrascale ddr4ddr3 hardware debug. 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. Ddr4s new memory interface employs pseudoopendrain pod termination where memory cells can store a logical 1 without consuming power.
Dbi in ddr4 will further improve the total system power and the concept is explained in the following section. Email julie carlson for other assistance, including. Ddr4 is the current cutting edge memory standard developed by jedec. This stateoftheart tuning acts independently on each pin, data.
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