Asic implementation of ddr sdram memory controller pdf download

The phy layer consists of me mory initialization logic, and addresscommanddata io. There is also a timing analysis about data communication between fpga and sdram before postsimulation. Hardware and layout design considerations for ddr2 sdram. This project implements a ddr ram controller at the rtl level for the. This paper describes double data rate synchronous dynamic random access memory controller.

In this paper, the double data rate sdram controller is implemented using asic methodology. This paper deals with reusability issues in the development of a double data rate ddr sdram controller module for fpgabased systems. Shift power reduction methods and effectiveness for testability in asic. For better throughput and speed, the controllers are to be designed with clock.

Ddr sdram referred to as ddr transfers data on both the rising and falling edge of the clock. The pub also includes an embedded calibration processor to execute hardwareassisted, firmwarebased training algorithms. This is a very a simple sdram controller which works on the de0 nano. Rapidchip platform asic market applications for the phy core. The ddr sdram memory controller is a configurable high performance memory controller for systems requiring access to external ddr sdram memory devices or ddr dimm modules with lowest latency and highest throughput. The lovehate relationship with ddr sdram controllers.

The memory controller provides a generic command interface to the users application. The designed ddr controller generates the control signals as synchronous command interface between the dram memory and other modules. Implementation of fpga based memory controller for ddr2 sdram sonali r majukar 1, arun s tigadi 2, hansraj guhilot 3 1 pg student, electronics and communication, k. Ddrii sdram memory controller interface design and. Ddr sdram transfers data on both the rising and falling edge of the clock.

If ondie termination is used at both the memories and the controller. Ddr sdram is mostly used in computer applications like laptops, networking, dsp processing systems. The ddr 4 controller is typically implemented in a system between the ddr and the bus master. The project also contains a simple push button interface for testing on the dev board. Ddr sdram description the ddr sdram specification details are available from jedec organization, part of the. The controller simplifies the sdram command interface to standard system readwrite interface and also optimizes the access time of readwrite cycle. Memory interfaces and controllers ddr and ddr2 sdram controller intel fpga ip overview the ddr and ddr2 sdram controllers handle the complex aspects of using ddr and ddr2 sdraminitializing the memory devices, managing sdram banks, and keeping the devices refreshed at appropriate intervals. Sdram or ddr sdram before being able to use this document correctly, you need to understand which type of sdram you have on your module.

The ddr memory controller design for the ddr sdram and the connection between the fpga provides a solution 3. A pcb board was also designed and fabricated to provide an interface between the fpga and the memory chip. Our work will focus on asic design methodology of double data rate ddr sdram controller that is located between the ddr sdram and bus master. It takes care of row refreshes and gives an easy to use interface for the host logic to access the sdram. Asic implementation of ddr sdram memory controller amit bakshi school of electronics engineering. Mimas v2 has a xilinx spartan 6 lx9 fpga in csg324 package has two builtin memory controllers and a 512mbit lpddr sdram lp stands for low power and ddr stands for double data rate. So it is not surprising that many fpga designers attach some type of memory to their fpga. Coreddr ddr sdram controller product summary intended use ddr sdram controller for standard sdram chips and dimms key features interfaces to external ram supports up to 1024 mb of memory synchronous interface highperformance access logic allows cascading of read and write requests enabling up to 100% throughput. This paper analyzes the current international technology trends and storage controller ddr2 sdram controller detailed technical specifications. Pdf rm9222 rm9000x2gl rm9222 rm9000x2gl rm9000 pmc2021862 ddr phy asic mips64 rm9000x2. This ddr controller is typically implemented in a system between the ddr and the bus master. Xilinx, xapp709 ddr sdram controller using virtex4 fpga. This application note examines the basics of ddr, provides general boardlevel design guidelines for using the msc711x.

But an sdram is really a singleport memory, so our controller has to play a trick. Table shows typical performance results for the ddr sdram controller using the quartus ii software version 9. Design and realization of sdram controller based on fpga. Asic implementation of ddr sdram memory controller ieee. A ddr memory controller is described wherein a core domain capture clock is created by programmably delaying the core clock of the memory controller. The host logic can use the sdram more likely an sram because of the controller. Fpga implementation of a time predictable memory controller. It describes the architecture of controller and takes explain for each module. The ddr sdram controller handles the complex aspects of using ddr sdraminitializing the memory devices, managing sdram banks, and keeping the devices refreshed at appropriate intervals. A verilog implementation of a ddr2 memory controller. The ddr sdram is an enhancement to the conventional sdram running at bus speed over 75mhz. Design and implementation of ddr sdram controller using. Ddr phy asic lsi rapidchip cw000722 cw761041 g12 ddr lsi cw761030 text.

Implementation of physical design in ddr sdram memory. For the rest of the paper memory should interpreted as the external ddr memory that the asic is interfacing to and design or cluster should be interpreted as the logic on the asic that interfaces the ddr memory. The ddr is a complete synchronous implementation of controller. For read operations from the ddr sdram, the memory controller must shift the data strobe into the middle of the data eye to properly capture the data. The lovehate relationship with ddr sdram controllers love the cheap memory, hate the complex controller by graham allan, mosaid almost everyone knows that the bulk of drams produced end up in desktop and laptop computers just like the one used to write this article. Because the ddr sdram has twice the sdram memory data rate, now has been widely used. The memory controller provides command signals for memory refresh, read and write. Us10269408b2 double data rate ddr memory controller. Ddr sdram memory controller reference design xapp851 v1. Design and implementation of high speed ddr sdram controller.

This interface reduces the effort to integrate the module with the remainder of the application and minimizes the need to deal. Implementation of fpga based memory controller for ddr2 sdram sonali r majukar1, arun s tigadi2. Ddr memory controller design based on fpga scientific. Rtl design of ddr sdram controller using verilog ijert.

This reference design has been developed using both sdram components and dimms. Double data rate synchronous dram ddr sdram has become a mainstream memory of choice in design due to its speed, burst access and pipeline features. The ddr3 sdram transmitted the read data and data strobes are edge aligned. For example if you have a heronfpga5 or heronfpga7 it has single data rate sdram, and you need to refer to the first half of this document sdram memory. Ddr ram is a widely used memory standard designed to provide. Micron technology, inc, reserves the right to change products or specifications without notice. Pdf design and fpga implementation of ddr3 sdram controller. Implementation of fpga based memory controller for ddr2 sdram. The work concentrates on the relative study of two memory controllers viz. Ddr controller provides a synchronous command interface to the ddr sdram. Xilinx xapp851 ddr sdram controller using virtex5 fpga. Now our controller makes the sdram appear as a dualport memory. The development of integrated systemsonachip soc is based on the reuse of modules, or intellectual property ip cores.

Through board verification, a burst mode with auto precharge and fullpage mode without auto precharge are achieved and the highest bandwidth in each. Implementation of physical design in ddr sdram memory controller. Unfortunately, they are not as easy to control as static memories, so an sdram controller is often used. Asic implementation of ddr sdram memory controller ijedr. On the right, the controller drives the sdram signals. In highend applications, like microprocessors there will be specific built in peripherals to. May 30, 2007 whether you use ip toolbench in sopc builder or the quartusa. Rapidchip platform asic ddri sdram ddr 1 phycore ddr 1 controller cw761030 addresscmd, the ddr 1 phy core with the ddr 1. Double data rate ddr sdram controller is based on asic design methodology. Ddr sdram memory controller is divided in an arbiter module, a data.

The ddr synchronous dynamic ram is an enhancement to the conventional. Li wang, qian zhang, design and implementation of ddr sdram controller based on fpga in satellite navigation system, signal processing icsp, vol. The memory controller is codesigned for the use with ethereal, but can be used with in any system. The msc711x memory controller supports double data rate synchronous dynamic random access memory ddr sdram devices, which are designed to be a high data rate migration path from the standard single data rate sdr memory devices. The double data rate ddr synchronous dynamic random access memory sdram controller is a generalpurpose memory controller that interfaces with industry standard ddr sdram. Asic implementation of ddr sdram memory controller amit bakshi. Fpga implementation of a time predictable memory controller for a chipmultiprocessor system edgar lakis kongens lyngby 20 immm.

In accordance with one embodiment, an apparatus is provided, comprising. Synopsys design compiler tool is used to obtain the necessary results. Table 14 shows typical sizes in logic elements les or adaptive lookup tables aluts for the ddr sdram controller. 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. Hardware and layout design considerations for ddr3 sdram. In particular, sdrams are very popular memories due to their high speed and low cost. Figure 1 is the block diagram of the ddr sdram memory controller that is. A dedicated memory controller is of prime importance in applications that do not contain microprocessors highend applications. This article introduces a sdram controller based on fpga. In this case, the design references 3rd party memory controller ip intellectual property from denali software. Implementation of ddr sdram memory controller for embedded soc b naresh, s rambabu, g lakshmi narayana. This interface reduces the effort to integrate the module with the remainder of the. Double data rate ddr sdram controller is implemented using cadence rtl compiler. Pdf asic implementation of ddr sdram memory controller.

We aim to achieve a performance, in terms of bandwidth, comparable to asic implementations. Simulation result of the read cycle of ddr sdram controller. This paper deals with the fpgaimplementation of a highspeed interface for ddr sdrams. To put things in perspective, heres a view of a typical fpga system using our sdram controller. The main function of ddr3 memory controller sdram is used to program and to store a data. In this project, we propose the design and implementation of a setup box for the ddr sdram memory controller. The ddr and ddr2 sdram controllers handle the complex aspects of using ddr and ddr2 sdraminitializing the memory devices, managing sdram banks, and keeping the devices refreshed at appropriate intervals. Summary this application note describes a ddr sdram controller implemented in a virtex4. Citeseerx document details isaac councill, lee giles, pradeep teregowda.

This paper deals with the fpga implementation of a highspeed interface for ddr sdrams. Double data rate synchronous dynamic randomaccess memory ddr sdram is a class of memory integrated circuits used in computers. The controller hardware was implemented using verilog and the. Introduction memory devices are almost found in all systems and nowadays high speed and high performance. Host side interface of the controller is availiable in. Learning fpga and verilog a beginners guide part 6 ddr. The study comprises area, power and timing analysis of the both. The controllers translate readandwrite requests from the local interface into all the necessary sdram command signals. Ddr sdram devices are lowcost, highdensity storage resources that are widely available from many memory vendors.

This process allo ws the datapath module to select the right. For the currently the most widely used data storage memory is ddrii sdram which is used in the highspeed, highprecision, and highmemory depth of the data storage and communication system, using ise software and calling the ip core of xilinx to create mcb, adopting the verilog hdl to achieve a common ddrii sdram controller interface for universal design and application based on. The ddr sdram controller translates read and write requests from the local interface into all the necessary sdram command signals. Simulation result of the initialization sequence of ddr sdram controller fig. Design and simulation of ddr3 sdram controller for high. With the rapid development of electronic science and computer science, the large scale integrated circuit applied in the military, economic and social life is more and more widely. If our controller gets two requests simultaneously, either it has to stall one agent, or record their requests and execute them later.

The ddr and ddr2 sdram controllers handle the complex aspects of using ddr or ddr2 sdraminitializing the memory devices, managing sdram banks, and. Design and implementation of memory controller for real time video acquisition using ddr3 sdram. Design and fpga implementation of ddr sdram controller. This project implements a ddr ram controller at the rtl level for the altera cyclone ii fpga on a de2 development board. The ddr sdram referred to as ddr doubles the bandwidth of the memory by. The predictability of the system is reached with an interleaved access pattern and a predictable scheduler. This reference design provides an implementation of the ddr memory controller implemented in lattice orca series 4 fpga device. From this research, various considerations for the implementation of a ddr ram controller were observed. The controller consists of a high performance timing and control state machine. Hardware and layout design considerations for ddr2 sdram memory interfaces, rev. Ddr sdram controller pipelined lattice semiconductor.

Implementation of ddr sdram memory controller for embedded soc. The novelty of this paper is to present the design techniques that lead to high performance memory controllers. Asic implementation of high speed pipelined ddr sdram controller. Introduction to ddr sdram memory controller the ddr sdram uses double data rate architecture to achieve highspeed data transfers. Implementation of fpga based memory controller for ddr2. The memory controller provides command signals for memory refresh, read and write operation and initialization of sdram. In the second place, we depict a memory interface data path architecture adapted for implementation on xilinx and altera fpgas. This allows a grosstonet bandwidth translation of the memory. Keystone architecture ddr3 memory controller users guide literature number. The fpgas csg324 package is important here because xilinx spartan 6 lx9 is available in some other packages that dont have a builtin memory controller. Nowadays, memory devices are almost found in all systems, high speed and high performance memories are in great demand. Synchronous dram sdram is preferred in embedded system memory design because of its speed and pipelining capability. Since that time the denali ddr controller ip has been used in countless diverse applications delivering superior data throughput and continuing to incorporate new innovative capabilities that provide.