Asic implementation of ddr sdram memory controller pdf download

Asic implementation of ddr sdram memory controller using vhdl is advanced version of regular sdram which is developed with advanced features like effective bandwidth of memory and able to transfer data on both edges of clock cycle. Ddr phy asic lsi rapidchip cw000722 cw761041 g12 ddr lsi cw761030 text. The controllers translate readandwrite requests from the local interface into all the necessary sdram command signals. Table shows typical performance results for the ddr sdram controller using the quartus ii software version 9. The project also contains a simple push button interface for testing on the dev board. May 30, 2007 whether you use ip toolbench in sopc builder or the quartusa. The controller consists of a high performance timing and control state machine. Xilinx xapp851 ddr sdram controller using virtex5 fpga. Li wang, qian zhang, design and implementation of ddr sdram controller based on fpga in satellite navigation system, signal processing icsp, vol. Ddr memory controller design based on fpga scientific. 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. Double data rate ddr sdram controller is implemented using cadence rtl compiler. Implementation of physical design in ddr sdram memory controller.

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. This application note examines the basics of ddr, provides general boardlevel design guidelines for using the msc711x. For address and command signals, the micron compensation cap scheme is another optional. The designed ddr controller generates the control signals as synchronous command interface between the dram memory and other modules. Ddrii sdram memory controller interface design and. Fpga implementation of a time predictable memory controller for a chipmultiprocessor system edgar lakis kongens lyngby 20 immm. Design and implementation of memory controller for real time video acquisition using ddr3 sdram. Design and realization of sdram controller based on fpga. 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. Asic implementation of ddr sdram memory controller amit bakshi.

This allows a grosstonet bandwidth translation of the memory. The ddr is a complete synchronous implementation of controller. Table 14 shows typical sizes in logic elements les or adaptive lookup tables aluts for the ddr sdram controller. There is also a timing analysis about data communication between fpga and sdram before postsimulation.

Asic implementation of high speed pipelined ddr sdram controller. In highend applications, like microprocessors there will be specific built in peripherals to. Implementation of ddr sdram memory controller for embedded soc b naresh, s rambabu, g lakshmi narayana. The ddr sdram referred to as ddr doubles the bandwidth of the memory by. Synopsys design compiler tool is used to obtain the necessary results. In accordance with one embodiment, an apparatus is provided, comprising. Ddr sdram devices are lowcost, highdensity storage resources that are widely available from many memory vendors. A dedicated memory controller is of prime importance in applications that do not contain microprocessors highend applications. Ddr sdram is mostly used in computer applications like laptops, networking, dsp processing systems. Micron technology, inc, reserves the right to change products or specifications without notice. Shift power reduction methods and effectiveness for testability in asic.

Hardware and layout design considerations for ddr2 sdram memory interfaces, rev. The ddr sdram is an enhancement to the conventional sdram running at bus speed over 75mhz. The memory controller is codesigned for the use with ethereal, but can be used with in any system. A ddr memory controller is described wherein a core domain capture clock is created by programmably delaying the core clock of the memory controller. Simulation result of the read cycle of ddr sdram controller. Figure 1 is the block diagram of the ddr sdram memory controller that is. Citeseerx document details isaac councill, lee giles, pradeep teregowda. This ddr controller is typically implemented in a system between the ddr and the bus master. The pub also includes an embedded calibration processor to execute hardwareassisted, firmwarebased training algorithms. Summary this application note describes a ddr sdram controller implemented in a virtex4. Because the ddr sdram has twice the sdram memory data rate, now has been widely used. Nowadays, memory devices are almost found in all systems, high speed and high performance memories are in great demand. Hardware and layout design considerations for ddr3 sdram.

On the right, the controller drives the sdram signals. It takes care of row refreshes and gives an easy to use interface for the host logic to access the sdram. In the second place, we depict a memory interface data path architecture adapted for implementation on xilinx and altera fpgas. The ddr3 sdram transmitted the read data and data strobes are edge aligned. 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.

Ddr ram is a widely used memory standard designed to provide. Command signals for memory refresh, read and write operation and sdram initialisation has been provided by memory controller. Implementation of ddr sdram memory controller for embedded soc. Apr 29, 2016 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. It describes the architecture of controller and takes explain for each module.

The double data rate ddr synchronous dynamic random access memory sdram controller is a generalpurpose memory controller that interfaces with industry standard ddr sdram. 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. Synchronous dram sdram is preferred in embedded system memory design because of its speed and pipelining capability. In particular, sdrams are very popular memories due to their high speed and low cost.

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. Asic implementation of ddr sdram memory controller ieee. This reference design provides an implementation of the ddr memory controller implemented in lattice orca series 4 fpga device. Unfortunately, they are not as easy to control as static memories, so an sdram controller is often used. 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. The ddr and ddr2 sdram controllers handle the complex aspects of using ddr or ddr2 sdraminitializing the memory devices, managing sdram banks, and. Introduction to ddr sdram memory controller the ddr sdram uses double data rate architecture to achieve highspeed data transfers. In this project, we propose the design and implementation of a setup box for the ddr sdram memory controller. Ddr sdram description the ddr sdram specification details are available from jedec organization, part of the. Us10269408b2 double data rate ddr memory controller.

Design and simulation of ddr3 sdram controller for high. Ddr sdram memory controller reference design xapp851 v1. Implementation of fpga based memory controller for ddr2. The development of integrated systemsonachip soc is based on the reuse of modules, or intellectual property ip cores. This project implements a ddr ram controller at the rtl level for the altera cyclone ii fpga on a de2 development board. The ddr synchronous dynamic ram is an enhancement to the conventional. This is a very a simple sdram controller which works on the de0 nano. This paper deals with the fpgaimplementation of a highspeed interface for ddr sdrams. 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. Keystone architecture ddr3 memory controller users guide literature number.

Xilinx, xapp709 ddr sdram controller using virtex4 fpga. This paper analyzes the current international technology trends and storage controller ddr2 sdram controller detailed technical specifications. If our controller gets two requests simultaneously, either it has to stall one agent, or record their requests and execute them later. Learning fpga and verilog a beginners guide part 6 ddr. The novelty of this paper is to present the design techniques that lead to high performance memory controllers. Through board verification, a burst mode with auto precharge and fullpage mode without auto precharge are achieved and the highest bandwidth in each. Hardware and layout design considerations for ddr2 sdram. The controller hardware was implemented using verilog and the. This paper describes double data rate synchronous dynamic random access memory controller. Simulation result of the initialization sequence of ddr sdram controller fig. Rtl design of ddr sdram controller using verilog ijert. Host side interface of the controller is availiable in.

In this paper, the double data rate sdram controller is implemented using asic methodology. Rapidchip platform asic market applications for the phy core. In highend applications, like microprocessors there will be specific built in peripherals to provide the interface to the sdram. From this research, various considerations for the implementation of a ddr ram controller were observed. The lovehate relationship with ddr sdram controllers. This interface reduces the effort to integrate the module with the remainder of the.

The phy layer consists of me mory initialization logic, and addresscommanddata io. 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. This process allo ws the datapath module to select the right. Pdf rm9222 rm9000x2gl rm9222 rm9000x2gl rm9000 pmc2021862 ddr phy asic mips64 rm9000x2. Rapidchip platform asic ddri sdram ddr 1 phycore ddr 1 controller cw761030 addresscmd, the ddr 1 phy core with the ddr 1.

Asic implementation of ddr sdram memory controller amit bakshi school of electronics engineering. The work concentrates on the relative study of two memory controllers viz. The study comprises area, power and timing analysis of the both. The ddr sdram controller translates read and write requests from the local interface into all the necessary sdram command signals. Pdf asic implementation of ddr sdram memory controller. This reference design has been developed using both sdram components and dimms. The ddr 4 controller is typically implemented in a system between the ddr and the bus master. A verilog implementation of a ddr2 memory controller. The main function of ddr3 memory controller sdram is used to program and to store a data.

Ddr sdram referred to as ddr transfers data on both the rising and falling edge of the clock. Double data rate ddr sdram controller is based on asic design methodology. This paper deals with the fpga implementation of a highspeed interface for ddr sdrams. The predictability of the system is reached with an interleaved access pattern and a predictable scheduler. Introduction memory devices are almost found in all systems and nowadays high speed and high performance. 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 majukar 1, arun s tigadi 2, hansraj guhilot 3 1 pg student, electronics and communication, k. Design and implementation of high speed ddr sdram controller. This paper deals with reusability issues in the development of a double data rate ddr sdram controller module for fpgabased systems. The controller simplifies the sdram command interface to standard system readwrite interface and also optimizes the access time of readwrite cycle. Double data rate synchronous dynamic randomaccess memory ddr sdram is a class of memory integrated circuits used in computers. 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.

The memory controller provides a generic command interface to the users application. For better throughput and speed, the controllers are to be designed with clock. 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. Ddr controller provides a synchronous command interface to the ddr sdram. To put things in perspective, heres a view of a typical fpga system using our sdram controller. The memory controller provides command signals for memory refresh, read and write. 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. Design and fpga implementation of ddr sdram controller. 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. Implementation of fpga based memory controller for ddr2 sdram. 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. 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.

So it is not surprising that many fpga designers attach some type of memory to their fpga. Asic implementation of ddr sdram memory controller ijedr. Design and fpga implementation of ddr3 sdram controller for high performance. Ddr sdram controller pipelined lattice semiconductor. 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. Implementation of physical design in ddr sdram memory. Ddr sdram memory controller is divided in an arbiter module, a data. The memory controller provides command signals for memory refresh, read and write operation and initialization of sdram. Ddr sdram transfers data on both the rising and falling edge of the clock.

Design and implementation of ddr sdram controller using. 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. We aim to achieve a performance, in terms of bandwidth, comparable to asic implementations. In this case, the design references 3rd party memory controller ip intellectual property from denali software. 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. Now our controller makes the sdram appear as a dualport memory. The delay of this capture clock is calibrated during a power on the initialization sequence in concert with a ddr memory in a system environment, thereby minimizing the effects of system delays and increasing both device and system yield. The host logic can use the sdram more likely an sram because of the controller. If ondie termination is used at both the memories and the controller. This article introduces a sdram controller based on fpga. This project implements a ddr ram controller at the rtl level for the. But an sdram is really a singleport memory, so our controller has to play a trick. Implementation of fpga based memory controller for ddr2 sdram sonali r majukar1, arun s tigadi2. Hardware and layout design considerations for ddr3 sdram memory interfaces, rev.