Ddr, ddr2, and ddr3 sdram with sopc builder introduction the altera ddr, ddr2, and ddr3 sdram highperformance controller megacore functions version 7. Ddr1 was originally referred to as ddr sdram or simple ddr. Please note that generating a bitstream may be prevented or the bitstream may have time logic present unless a license for the ip is purchased. For ddr4, lpddr4 and more advanced features, see the enhanced universal ddr memory controller umctl2 the upctl serves the memory control. The memory controller provides a generic command interface to the users application.
With our approach, it is possible to generate a highly reconfigurable ddr controller. File system memory driver selection guide micrium os. The ddr, ddr2, and ddr3 sdram controllers with altmemphy ip offer the highperformance controller ii hpc ii, which provides high efficiency and advanced features. Opb double data rate synchronous dram sdram controller for xilinx fpgas provides a ddr sdram controller which connects to the opb and multiple channel interfaces and provides the control interface for ddr sdrams. The memory controller is designed to support highperformance. The file system does not provide any driver for such memory. To allow the user to create a mch opb ddr2 sdram controller that is uniquely tailored for the. Controller compiler to each of the altera device families. Using the sdram memory on alteras de2 board with verilog. Pdf todays highper for mance cpus demand highspeed memor y. Sdram controller, ddr ddr xsxilinx december 4, 2006 product specification alliancecore facts provided with core documentation user guide design file formats edif or ndc netlist, vhdl, verilog constraints files ucf file verification test bench instantiation templates vhdl, verilog. Our work will focus on asic design methodology of double data rate ddr sdram controller that is located between the.
Design guidelines for implementing ddr and ddr2 sdram. Figure 11 shows a systemlevel diagram includin g the example toplevel file that the ddr or ddr2 sdram controller. Pdf synchronous dram sdram has become a mainstream memory of choice in design due to its speed, burst access and pipeline. The memory controller is a digital circuit that manages the flow of data going to and from the computers main memory. Altera corporation ddr sdram controller white paper 3 ddr sdram controller description ddr sdram controller interface signals the ddr sdram controller interface signals are shown in table 2 interface signals. The ddr sdram is an enhancement to the traditional.
With our approach, it is possible to generate a highly reconfigurable ddr controller that minimizes the recoding effort for hardware development. The ddr sdram uses a double data rate architecture to achieve highspeed operation. Ddr sdram controller pipelined lattice semiconductor. We created such basic system using a xyloem board as part of our validation process. The program ram can be located in the internal for instance sram or external for example ddr sdram memory of the microcontroller. The memory controller equivalent for scsi is, in fact, a usb host controller. Abstract this project work is a working implementation of high speed ddr double data rate sdram controller. Home products intellectual property lattice ip cores. Double data rate, column address strobe cas, synchronous dynamic ram. The principle and commands of ddr sdram controller design are explained in this paper. Functional description the ddr sdram controller block diagram, illustrated in figure 1, consists of four functional modules. 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. The core accepts commands using a simple local interface and translates them to the command sequences required by ddr4 sdram. Ddr sdram memory controller reference design xapp851 v1.
The phy layer consists of me mory initialization logic, and addresscommanddata io. The project also contains a simple push button interface for testing on the dev board. It is assumed that the reader is familiar with ddr sdram and microblaze. Fpga implementation of double data rate ddr sdram controller. Choose dqs group placement for the ddr2 sdram controller to choose dqs group placement for the ddr2 sdram controller, follow these steps. For ddr4, lpddr4 and more advanced features, see the enhanced universal ddr memory controller umctl2. This is a very a simple sdram controller which works on the de0 nano. Ddr double rate sdram controller reference design verilog. The xilinx mch opb ddr2 sdram controller is a soft ip. What is the difference between sdram, ddr1, ddr2, ddr3 and.
Home products intellectual property lattice ip cores ddr sdram controller pipelined for ispxpga and orca4 ddr sdram controller pipelined for ispxpga and orca4 overview ddr double data rate sdram was introduced as a replacement for sdram. Ddr4 sdram controller core northwest logics double data rate 4 ddr4 sdram controller core is designed for use in applications requiring high memory throughput, high clock rates and full programmability. 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. Ddr1 double data rate sdram, or simply ddr1, was designed to replace sdram. Designware basic universal ddr memory and protocol.
The xilinx processor local bus double data rate plb ddr synchronous dram sdram controller for virtex ii and virtexii pro fpgas provides a ddr sdram controller which connects to the plbbus and provides the control interface for ddr sdrams. 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. The core accepts commands using a simple local interface and translates them to the command sequences required by ddr sdram devices. The ddr and ddr2 sdram controllers with altmemphy ip offer the highperformance controller ii hpc ii, which provides high efficiency and advanced features. Ddr double rate sdram controller reference design verilog code, can be directly used, very good. A low power ddr sdram controller design international journal. Pdf currently, the demand of memories has been increasing due to its higher speed, lower cost and lower power consumption. The ddr2 sdram controller pipelined is available as an ipexpress user configurable ip core, which allows the configuration of the ip and generation of a netlist and simulation file for use in designs. The double data rate architecture is essentially a 2nprefetch architecture, with an interface. Now days, ddr sdram double data rate synchronous dynamic random access memory has become the most popular class of memory used in computers due to its high speed, burst access and pipeline feature. Ddr sdram controller megacore function user guide gettingabout this core about this core the ddr sdram controller is optimized for altera cyclone, stratix, 1 stratix gx, and apex ii devices. All signals are synchronous to the system clock and outputs are registered at the output of the sdram controller.
Double data rate ddr sdram controller lattice semiconductor nonpipelined version users guide introduction this version of the lattice ddr sdram controller does not have pipelining, and is signi. Design and vlsi implementation of ddr sdram controller for. Using highperformance ddr, ddr2, ddr3 sdram with sopc builder. Pdf design and vlsi implementation of ddr sdram controller. Ds496 mch opb double data rate ddr synchronous dram sdram. Design of ddr4 sdram controller ieee conference publication. Design and implementation of high speed ddr sdram controller. Ddr double data rate sdram was introduced as a replacement for sdram memory running. Design and implementation of ddr sdram controller using. The xilinx onchip peripheral bus double data rate opb ddr synchronous dram sdram controller that connects to the opb and provides the contro l interface for ddr sdrams. Ddr sdram, also retroactively called ddr1 sdram, has been superseded by ddr2 sdram, ddr3 sdram and ddr4 sdram.
A dedicated memory controller is of prime importance in applications that do not contain microprocessors highend applications. The lattice double data rate ddr synchronous dynamic random access memory sdram controller is a generalpurpose me mory controller that interfaces with indust ry standard ddr1ddr2 memory devicesmodules and provides a generic command interface to user applications. To add the sdram, in the window of figure 3 select memories and memory controllers sdram sdram controller and click add. The complexity of instructions to control the memory devices increases with the increase in technology. 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. Asic implementation of ddr sdram memory controller amit bakshi sudhanshu shekhar tribikram pradhan ratnadip dey school of electronics pandey. Sdram controller with altmemphy ip offers the highperformance controller ii hpc ii, which provides high efficiency and advanced features.
This application note examines the basics of ddr, provides general boardlevel design guidelines for using the msc711x. Features the xilinx mch opb ddr sdram controller is a. Home products intellectual property lattice ip cores ddr sdram controller pipelined for ispxpga and orca4 ddr sdram controller pipelined for ispxpga and orca4 overview ddr double data rate sdram was introduced as a replacement for sdram memory running at bus speeds over 75mhz. Xilinx xapp709 ddr sdram controller using virtex4 fpga. Pdf asic implementation of ddr sdram memory controller. Using the sdram memory on alteras de2 board with verilog design. The work concentrates on the relative study of two memory controllers viz. The double data rate architecture is essentially a 2nprefetch architecture with an interface designed to transfer two data words per clock cycle at the io pins. Double data rate synchronous dynamic randomaccess memory, officially abbreviated as ddr sdram, is a double data rate ddr synchronous dynamic randomaccess memory sdram class of memory integrated circuits used in computers. This implementation uses the clock directly controls technology to realize data acquisition, an. The ddr sdram controller is located in between the ddr sdram and bus. Asic implementation of ddr sdram memory controller. Ddr sdram controller verilog code and chinese documentation.
W9425g6kh is a cmos double data rate synchronous dynamic random access memory ddr sdram, organized as 4,194,304 words 4 banks 16 bits. Ddr sdram controller core northwest logics double data rate ddr sdram controller core is designed for use in applications requiring high memory throughput, high clock rates and full programmability. Synchronous dynamic randomaccess memory sdram is any dynamic randomaccess memory dram where the operation of its external pin interface is coordinated by an externally supplied clock signal dram integrated circuits ics produced from the early 1970s to early 1990s used an asynchronous interface, in which input control. Ds425 plb double data rate ddr synchronous dram sdram. The 128mb low power ddr sdram uses a double data rate architecture to achieve highspeed operation. Lattice semiconductor ddr sdram controller 2 since the ddr sdram controller takes care of activatingprecharging the banks, user only needs to issue simple readwrite commands. Figure 11 on page 11 shows a systemlevel diagram including the example toplevel file that the ddr3 sdram controller with altmemphy ip creates for you. Mx sdram controller the sdram arrays are mapped according to table 1. Xilinx xapp851 ddr sdram controller using virtex5 fpga. The microtronix streaming multiport sdram controller ipcore pn. Learning fpga and verilog a beginners guide part 6 ddr. The ddr sdram controller module is the toplevel module that instantiates the three lower modules and brings the whole design together. The access time for read and the write cycle is optimized based on the cas latency and burst length of the ddr sdram.
Ddr3 sdram controller with altmemphy user guide, external. The ddr sdram read and write operations are simplified by the controller. Scsi devices exist using a transport medium such as usb. This paper deals with reusability issues in the development of a double data rate ddr sdram controller module for fpgabased systems. Pdf implementation of ddr sdram controller using verilog. Now days, ddr sdram double data rate synchronous dynamic random access memory has become the most popular class of memory used in computers due to its high speed, burst access and pipeline. Sdram controller, ddr ddr xsxilinx december 4, 2006 product specification alliancecore facts provided with core documentation user guide design file formats edif or ndc netlist, vhdl, verilog constraints files ucf file. The double data rate ddr synchronous dynamic random access memory sdram controller is a generalpurpose memory controller that interfaces with industry standard ddr sdram. Ddr5 is the fifthgeneration double data rate ddr sdram, and the feature enhancements from ddr4 to ddr5 are the greatest yet.
Keystone architecture ddr3 memory controller users guide literature number. Ddr controller provides a synchronous command interface to the ddr sdram memory along with several control signals. The advanced features available in these devices allow you to interface direct ly to ddr sdram. The detailed architecture of the proposed controller is shown in fig. Contribute to stffrdhrnsdram controller development by creating an account on github. Ddr sdram controller module consists of three main modules, the control interface, command and data path modules. Generate a ddr2 sdram controller megacore function figure 7. The core accepts commands using a simple local interface and translates them to the command sequences required by ddr sdram. Ddr sdram controller is used as ip core into any fpga based embedded system having requirement. Ddr and ddr2 sdram controller with altmemphy ip user. Design guidelines for implementing ddr and ddr2 sdram interfaces in cyclone iii devices figure 1.
While previous generations focused on reducing power consumption and. Synchronous dram sdram is preferred in embedded system memory design because of its speed and pipelining capability. 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 lovehate relationship with ddr sdram controllers. The project also contains a simple push button interface for. Figure 151 shows a systemlevel diagram including the example toplevel file that the ddr, ddr2, or ddr3 sdram controller with. All signals are synchronous to the system clock and outputs are registered at the output of the sdram controller core. Select device instantiate phy and controller in a quartus ii project.
For the examples listed in this app note, the sdram will reside on cs2 with the base address of 0x08000000. For initializing the ddr sdram controller, separate state machines are designed internally. The ddr synchronous dynamic ram is an enhancement to the conventional sdram running at bus speed over 75mhz. It is assumed that the reader is familiar with ddr sdrams and the ibm powerpc. In highend applications, like microprocessors there will be specific built in peripherals to provide the interface to the sdram.
The designware basic universal ddr controllers consist of the universal ddr protocol controller and the universal ddr memory controller, which support the jedec ddr3, ddr2, mobile ddr, lpddr2, and lpddr3 sdram standards. Ddr sdram, as the first generation of ddr memory, the prefetch buffer is 2bit, which is the double of sdr sdram. Second generation of ddr memory ddr2 scales to higher clock frequencies. Currently, the demand of memories has been increasing due to its higher speed, lower cost and lower power consumption. This core reduces the efforts required to integrate. It supports data transfers on both edges of each clock cycle, effectively doubling the. The advanced features available in these devices allow you to interface direct ly to ddr sdram devices and to use.
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