154 results about "DDR SDRAM" patented technology

A memory interface circuit is connectable to a DDR-SDRAM which outputs read data in synchronization with a data strobe signal together with the data strobe signal. A clock generator generates internal clock signals and memory clock signals supplied to the DDR-SDRAM. The memory interface circuit determines a delay of arrival of the data strobe signal relative to the corresponding internal clock signal by using a data strobe signal inputted in a read cycle with respect to the DDR-SDRAM, samples the arrived read data, based on a signal obtained by shifting the phase of the arrived data strobe signal, and synchronizes the sampled read data to the corresponding internal clock signal on the basis of the result of determination of the arrival delay.

A DRAM command scheduling algorithm is presented that is designed to alleviate various constraints imposed upon high performance, high datarate, short channel DDRx SDRAM memory systems. The algorithm amortizes the overhead costs of rank-switching time and schedules around the t_FAW bank activation constraint. A multi-rank DDRx memory system is also presented having at least two ranks of memory each having a number of banks and at least one memory controller configured for performing the hardware-implemented step of DRAM command scheduling for row access commands and column access commands. The step of command scheduling includes decoupling the row access commands from the column access commands; alternatively scheduling the decoupled row access commands to different ranks of memory; and group scheduling the decoupled column access commands to each bank of the number of banks of a given rank of the different ranks of memory.

A programmable compensated delay for a double data rate (DDR) synchronous dynamic random access memory (SDRAM) interface is provided. A programmable compensated delay apparatus includes a reference delay calibration circuit for providing a measured number of delay elements in one cycle. A programmable delay register provides a desired delay value. A conversion logic is coupled to the reference delay calibration circuit and the programmable delay register for receiving both the measured number of delay elements in one cycle and the desired delay value. The conversion logic provides a number of required delay elements. A delay circuit is coupled to the conversion logic for receiving the number of required delay elements and providing the desired delay. A SDRAM control logic provides a refresh start signal to the reference delay calibration circuit for updating the delay circuit during each DRAM refresh. The DQS clock strobe on the DDR SDRAM is applied to the delay circuit and is delayed by the desired delay.

A data control circuit for a double data rate (DDR) synchronous dynamic random-access memory (SDRAM) that secures a stable reading/writing operation of DDR SDRAM data by generating an actively controllable internal data strobe signal. The data control circuit includes an internal data strobe signal generating circuit generating and outputting an internal data strobe signal a rising edge of which is located in a center part of valid DDR SDRAM data; a read data control circuit for receiving the internal data strobe signal, generated from the internal data strobe signal generating circuit as a clock input, dividing captured data into even data and odd data, and transmitting the even data and the odd data to a system bus; and a write data control circuit transmitting the internal data strobe signal input from the internal data strobe signal generating circuit to a DDR SDRAM device as a data strobe signal.

A memory module is provided as well as a method for forming a memory module. The memory module includes a printed circuit board having opposed first and second outside surfaces. At least one via can extend through the printed circuit board and couples a conductor on one outside surface to a conductor on another outside surface. A semiconductor memory device on one of those outside surfaces can thereby be connected to one end of the via, with another semiconductor memory device on the opposing outside surface connected to the other end of the via. Preferably, the pair of memory devices are placed on a portion of each respective outside surface so that they essentially align in mirrored fashion with each other. Accordingly, any vias which extend from the footprint of one memory device will take the shortest path to the footprint of the other memory device, with the stubs between the footprint and the via being of essentially the same length and relatively short. The printed circuit board preferably has no more than four conductive layers dielectrically spaced from each other. Two layers are reserved for the opposing outer surfaces, and two layers carrying power and ground signals are embedded within the board. The memory devices are preferably DDR SDRAMs connected to each other as well as a memory controller, each of are placed and maintained upon a single printed circuit board.

Provided is a write circuit of a DDR SDRAM, in which a clock domain crossing is generated from a writing driver during a data write operation and a proper data is always transferred to a gio bus line by using the delay of an internal data strobe signal's falling for a certain amount of time as an input data strobe bar signal. Moreover, by using a skew detection circuit, it is possible to detect a skew tDQSS between a clock and a data strobe, and the skew tDQSS is automatically compensated by the skew compensation circuit. From the perspective of a timing error between the clock and the data strobe, therefore, the write operation of the DDR SDRAM has twice the timing margin (0.5tCK) compared to that of the related art. This means that a stable, high-speed write operation of the DDR SDRAM can be made possible.

Certain embodiments of the invention may be found in an single chip satellite set-top box solution that comprises demodulation, decoding and audio/video display functions integrated within a single chip. The single chip solution for the satellite set-top box is adapted to provide demodulation, display, and other related set-top box functions for a system that may be adapted to handle two incoming data streams modulated using an 8PSK, 8PSK-turbo or QPSK scheme, for example. Accordingly, the single chip satellite set-top box solution comprise dual 8 PSK/8 PSK-turbo/QPSK demodulators, a MIPS CPU, a 16-bit DDR-SDRAM, graphics display capability for handling two channels, and audio/video decoders and DACs for handling two incoming channels. The single chip satellite set-top box solution may also comprise integrated peripheral support for major set top box functions including a smart card interface, IR receivers, and general purpose input/output (GP/IO) pins.

The invention relates to a processing module capable of reconstructing signals based on a VPX bus, comprising a high-speed board card, a front panel, a radiating cover board, a module lifter, a positioning pin and a locking mechanism part. The high-speed board card comprises a VPX 6U standard high-speed printing board, a power supply circuit, an MPC7448 processor chip, an MV64460 bridging chip, a FPGA (Field Programmable Gate Array) chip, a DDR SDRAM (Digital Data Receiver Synchronous Dynamic Random Access) and FLASH, a high-speed high density electric connector, an opto-electrical converter and a kilomega Ethernet interface. The high-speed board card comprises four processing nodes, each processing node comprises one MPC7448 processor chip, one MV64460 bridging chip and the DDR SDRAM; the MV64460 bridging chip is respectively connected with the MPC7448 processor chip and a storage DDR SDRAMFPGA through a CPU interface, the DDR SDRAM interface and a Device interface.

A method for masking a ringing in a DDR SDRAM comprises in a write mode, generating first and second synchronizing signals by means of a DQS signal inputted from an exterior circuit, in order to synchronize input data, latching data in odd sequences from among the inputted data, which are sequentially inputted, at a rising edge of the first synchronizing signal, and latching data in even sequences from among the data, which are sequentially inputted, at a rising edge of the second synchronizing signal, aligning the data in odd sequences and the data in even sequences at a falling edge of the DQS signal so that the odd and even sequenced data has the same synchronized timing, and blocking activation of the second synchronizing signal by means of a first control signal, the a first control signal being synchronized with the falling edge of the last valid DQS signal that is normally inputted, so as to enable the blocking step and thereby masking the ringing phenomenon. In the method for masking the ringing phenomenon, the point at which the DIS_DSB signal is enabled in a low state is synchronized with the last falling edge of the normal DQS signal, and therefore the DSF2 signal is disabled.

The invention discloses design architecture and a method for secure load balancing by utilizing SSL communication protocol, in particular to provide secure and reliable data communication for client and load balancing equipment by introducing SSL (Security Socket Layer) communication protocol. The invention mainly designs a processor SSL-PU based on SSL encryption, wherein, the processor SSL-PU is loaded in a load balancer and comprises a processing unit (PU), a memory cell (Flash, SRAM, DDR SDRAM, etc.), an Ethernet network controller (PCI, PCI-X, PCI-E) and GbE PHY (RJ45 interface). SSL-PU well solves the security problem caused by traditional load-balancing equipment and client clear text and the problem that traditional SSL encryption technology based on software excessively occupies system CPU and memory resources, thereby saving server bandwidth, increasing throughput and improving flexibility and availability of network; the processor well realizes the security data interaction with the client, and delivers data in the form of clear text to a load-balancing module; the load balancing module locates a request to a corresponding server according to load balancing algorithm; the server transmits data to the load balancing equipment; and the load balancer with an SSL-PU module transmits encrypted security data to the client, thereby completing secure data interactive access. The invention is particularly suitable for secure load-balancing scheduling of load balancing equipment of which the back end is a cluster system.

The method includes following steps: (1) optimizing parsed address; (2) setting up first order state register and using Auto Pre-charge mode; (3) optimizing sending time for Active command; (4) dynamic controlling Refreshing time interval; (5) buffering reading/writing commands, dividing reading/writing time slices, sending reading/writing commands in concentration respectively. Advantages are: four banks in SDRAM in collaborative work to take full advantage of SDRAM ability to communicate; bandwidth use ratio reached to more than 85úÑ, realizing decoding for AVS and H.264 video in high resolution, raised reading/writing efficiency greatly, and east of implementation by hardware. Moreover, the invention is not only suitable to SDRAM and DDR SDRAM, and video decoding.

Multiple data processing circuits may share a semiconductor memory circuit, such as double-data-rate synchronous dynamic random access memory (DDR-SDRAM). A data processing circuit (202-1 or 202-2) ending control of a semiconductor memory circuit (201) supplies a clock enable signal and chip select signal at predetermined levels. A data processing circuit (202-2 or 202-1) starting control of a semiconductor memory circuit (201) supplies a clock enable signal and chip select signal at the same predetermined levels, before the data processing circuit (202-1 or 202-2) ending control stops supplying a clock enable signal and chip select signal. Therefore, a clock enable signal and chip select signal do not enter an undefined state, and malfunctions that could otherwise occur are prevented.

The invention relates to a FPGA signal processing board, belonging to the technical field of digital signal processing. The processing board comprises one power supply module, four FPGA processing sub modules, one FPGA transmit-receive module, one interconnect chip set module and one FPGA load application module, the FPGA processing sub module and the FPGA transmit-receive module are connected by full interconnect mode, the interconnect bandwidth between every two modules is as high as 1.6 B/s. The processing board can implement the external multiple high speed interfaces and load the DDR SDRAM with capacity of 4GB by PCI bus, Rapid IO bus and source synchronous interface, the storage bandwidth is as high as 10688 MB/s. the FPGA on the board has flexible configuring mode by adopting the DSP+CPLD+NAND configuring combination. The invention is suitable for the condition with harsh signal processing real time performance requirement, such as radar signal processing, image processing and communication base station and so on.

A double data rate (“DDR”) synchronous dynamic random access memory (“SDRAM”) semiconductor device is provided that prevents a conflict between data read from and data written to the DDR SDRAM semiconductor device when data is written to the DDR SDRAM semiconductor device, which includes a delay locked loop (“DLL”) circuit, a clock signal control unit, an output unit, and an output control unit, where the DLL circuit compensates for skew of an input clock signal and generates an output clock signal; the clock signal control unit receives a read signal activated when data stored in the DDR SDRAM semiconductor device is read out, a DLL locking signal activated when the DLL circuit performs a locking operation on the input clock signal, and the output clock signal, and outputs the output clock signal when either the read signal or the DLL locking signal is active; the output unit buffers data stored in the DDR SDRAM semiconductor device and outputs the data to outside of the DDR SDRAM semiconductor device in synchronization with the output clock signal output from the clock signal control unit; and the output control unit receives the output clock signal output from the clock signal control unit, and the read signal, and outputs the read signal to the output unit in synchronization with the output clock signal output from the clock signal control unit.

The present invention comprises a dual bank FIFO memory buffer operable to buffer read data from memory and thereby compensate for specific timing problems in certain computerized systems. One embodiment of the invention includes a dual bank FIFO that comprises a first bank of memory elements operable to buffer memory data and a second bank of memory elements operable to buffer memory data. Write control address logic is operable to store selected memory data in memory elements with selected addresses within a bank of memory elements, and write control timing logic is operable to selectively grant write access to the banks of memory elements at predetermined time. Also, read control logic operable to read data stored in the first and second banks.

Double data rate (DDR) synchronous dynamic random access memory (SDRAM) data is sampled into a synchronization circuit on both rising and falling edges of a data strobe (DQS) signal, into separate latches. A delay calculation and timing synchronization unit determines the location of the data strobe signal relative to rising/falling edges of an internal clock, then decides which sample to transfer into the internal data path and whether to use the rising or falling internal clock edge. Every DDR-SDRAM read transaction is thus automatically synchronized without the need for predetermined delay(s), allowing a wide range of operating frequencies and frequency variations to be accommodated.

A data strobe buffer in SDRAM is disclosed. The data strobe buffer for a synchronous dynamic read only memory (SDRAM), comprising: a first dynamic buffer generating a first pulse at a rising edge of a data strobe signal; a second dynamic buffer generating a second pulse at a falling edge of the data strobe signal; and a block for generating an enable signal which is enabled in a range between a rising edge of an external clock signal and a logic high state of the second pulse, and providing the second dynamic buffer with the enable signal. The data strobe buffer ensures a minimum value of tDQSS parameter in DDR SDRAM even if speed of the chip increases or operation condition of the chip becomes tight, thereby preventing the data strobe buffer from being misoperated due to the damping and the fluctuation of the data strobe signal.

A two-chip/single-die switch architecture and a method for accessing a DDR SDRAM memory store in a switching environment are presented. The two-chip/single-die architecture includes an internal memory storage block on the single-die, an external memory storage interface to a Double Data Rate Synchronous Dynamic Random Access Memory (DDR SDRAM), an external memory manager, and a packet data transfer engine effecting packet data transfers between an internal memory store and the external DDR SDRAM memory. The packet data transfer engine operates as an adaptation layer addressing issues related to employing appropriate: addressing schemes, granule sizes, memory transfer burst sizes, access timing, etc. The packet data transfer engine includes a minimal number of dual mode operational blocks such as: a queue manager, and adaptation receive and transmit blocks. The method relates to a packet data transfer discipline addressing random memory access latencies incurred in employing DDR SDRAM, using predictive bank switching to hide random access latencies, packet length dependent variable memory write burst lengths to minimize bank switching, and performing memory read and write operations during corresponding read and write windows. Advantages are derived from the a space-efficient two-chip/single-die switching node architecture implemented with a reduced amount of dual mode logic, and also from DDR SDRAM bandwidth utilization efficiencies.