41 results about "Data coherence" patented technology

In the present invention, a memory, and in particular, a NOR emulating memory comprises a memory controller having a non-volatile memory for storing program code to initiate the operation of the memory controller. The controller has a first bus for receiving address signals from a host device and a second bus for interfacing with a RAM memory, and a third bus for interfacing with a NAND memory. A volatile RAM memory is connected to the second bus. A NAND memory is connected to the third bus. The controller receives commands and a first address from the first bus, and maps the first address to a second address in the NAND memory, and operates the NAND memory in response thereto. The RAM memory serves as cache for data to or from the NAND memory. The controller also maintains data coherence between the data stored in the RAM memory as cache and the data in the NAND memory. The invention further has a first buffer for storing data from the NAND memory in response to a read command to be written to the RAM memory, and a second buffer for storing data from the RAM memory to be written to the NAND memory. In the event of a read operation, if the data from the specified address is in the RAM memory, then the data is read from the RAM memory completing the read operation. In the event of a read operation, and if the data from the specified address is not in the RAM memory, and if there is sufficient space in the RAM memory to store an entire page of data from the NAND memory, then the entire page is read from the NAND memory, stored in the first buffer and then stored in the RAM memory, and from the specified address is read out, completing the read operation. Finally, in the event of a read operation, and if the data from the specified address is not in the RAM memory, and if there is insufficient space in the RAM memory to store an entire page of data from the NAND memory, then an entire page from the RAM memory is first stored in the second buffer, then an entire page is read from the NAND memory, stored in the first buffer, and from the first buffer, stored in the now freed RAM memory and data from the specified address is read out, completing the read operation. The page of data from the second buffer is subsequently stored back into the NAND memory after the completion of the read operation thereby reducing read latency.

The disclosed embodiments provide techniques for reducing address-translation latency and the serialization latency of combined TLB and data cache misses in a coherent shared-memory system. For instance, the last-level TLB structures of two or more multiprocessor nodes can be configured to act together as either a distributed shared last-level TLB or a directory-based shared last-level TLB. Such TLB-sharing techniques increase the total amount of useful translations that are cached by the system, thereby reducing the number of page-table walks and improving performance. Furthermore, a coherent shared-memory system with a shared last-level TLB can be further configured to fuse TLB and cache misses such that some of the latency of data coherence operations is overlapped with address translation and data cache access latencies, thereby further improving the performance of memory operations.

A method for measuring bi-directional similarity between a first signal of a first size and a second signal of a second size includes matching at least some patches of the first signal with patches of the second signal for data completeness, matching at least some patches of the second signal with patches of the first signal for data coherence, calculating the bi-directional similarity measure as a function of the matched patches for coherence and the matched patches for completeness and indicating the similarity between the first signal and the second signal. Another method generates a second signal from a first signal where the second signal is different than the first signal by at least one parameter. The method includes attempting to maximize a bi-directional similarity measure between the second signal and the first signal.

A data coherence system includes a generation number written to a data track of a logical sub-system. The generation number is compared to a corresponding generation number in a processing device when it is initialized. If the two generations numbers are the same, the generation numbers are incremented and saved. If not, cache associated with the logical sub-system residing within the processing device is erased and the generation numbers are reset.

A data processing system 2 is provided with a general purpose programmable processor 4 and an accelerator processor 6. Coherency control circuitry 20 manages data coherence between data items which may be stored within a cache memory 16 and/or a further memory 18. Memory access requests from the accelerator processor 6 are received by a memory request switching circuitry 22 which is responsive to a signal from the accelerator processor 6 to direct the memory access request either via coherency control circuit 20 or directly to the further memory 18.

The invention relates to production material management system and method of a nuclear power plant. The system comprises a device ledger module, a maintenance outline module, a maintenance program module, a tool management module, a device type management module, a spare part management module, and the like. In the invention, a unified work platform system is formed, the works of query, treatment, and the like are greatly convenient, relationships are established among the modules, data is combined together in an organic mode, the problem of information isolated island is deracinated, data coherence is ensured, the system friendliness is strengthened, the problems of complex query operation are also solved, and the work efficiency is greatly improved.

The invention includes following core points: dividing data into data groups; then, main system obtains check words in main and sub systems corresponding to each sub system data respectively; finally, main system compares words in main and sub systems corresponding to each sub system data; if consistent, then ending the check; otherwise, synchronizing the corresponding inconsistent data. Since data are divided into groups, the invention reduces amount of calculation, and amount of traffic in each checkup. Advantages are: easy for single-handed process, and raising flexibility of data check and synchronization process of main and sun system.

A shared virtual memory management apparatus for ensuring cache coherence. When two or more cores request write permission to the same virtual memory page, the shared virtual memory management apparatus allocates a physical memory page for the cores to change data in the allocated physical memory page. Thereafter, changed data is updated in an original physical memory page, and accordingly it is feasible to achieve data coherence in a multi-core hardware environment that does not provide cache coherence.

The invention discloses a method for extracting a dual-time-phase dual-polarized interference SAR image water area, namely a SAR image water area extracting method. The method successively comprises subpixel-level registration, coherence coefficient calculation, total power diagram calculation, total power mean value calculation, total power normalized scattering coefficient calculation, water area index calculation, calculation of water area average and standard deviation of a statistical water area, and binaryzation. The method, in view of low precision and low automation degree of water interpretation on a SAR image, provides, based on a characteristic that a coherent SAR image has good coherence to most ground features within short time intervals, a SAR image water area index based on dual-polarized SAR data coherence coefficient and intensity value, enhances water area information on the image, restrains other ground features, improves the automation degree of water interpretation in each time-phase image, helps to enhance users' recognition and accuracy of SAR images, and accelerates the popularization and application of the SAR in flood monitoring and topographic mapping.

The invention provides a complete polarization synthetic aperture radar target decomposition method for adaptive selection unitary transformation. The method comprises the following steps: (1) performing two unitary transformations for singh for data coherence T matrix of the complete polarization synthetic aperture radar to obtain the matrix, (the formula is as shown in specification); (2) performing other two unitary transformations for the coherence T matrix to obtain the matrix T(omega), wherein the first unitary transformation is used for performing the spiral angle compensation and restraining the volume scattering excessive estimation of model decomposition, the second unitary transformation is used for further restraining the volume scattering excessive estimation and reducing one degree of freedom of the coherence T matrix; (3) comparing with element (the formula is as shown in specification) of the matrix (the formula is as shown in specification) with the element T33(omega) of the matrix T(omega); if (the formula is as shown in specification), and (the formula is as shown in specification), otherwise, T is equal to T(omega); (4) performing three-component model decomposition on coherence T matrix. The two unitary transformations for singh in the step (1) or the two unitary transformations in the step (2) can be selected for the coherence T matrix in a self-adaption mode by the method according to the real situation of the object, and the volume scattering excessive estimation problem of the model decomposition can be effectively restrained.

The invention provides a crack prediction method for the preferred orientation daughter coherence, and belongs to the field of oilfield exploration. The method generates orientation daughters through a pre-stack seismic channel set, and then calculates coherence attributes among different orientations, and finally acquires a seismic data coherence body of the preferred orientation. The method includes: (1) pre-treatment of pre-stack seismic data; (2) extraction of a macro surface element channel set; (3) stacking branch orientation full migration distance channel sets to form the orientation daughters; (4) calculating seismic orientation daughter coherence to form orientation coherence daughters; and (5) calculating the maximum orientation coherence daughter to obtain the seismic data coherence body of the preferred orientation.

Data coherence checking apparatus, a redundant array of independent disks (RAID) controller and a storage system having the checking apparatus and a method therefor are proposed. The present invention employs an XOR operation unit and an OR operation unit to check the coherence of data to be checked. The XOR operation unit is used to perform XOR operation on the data to be checked. After the XOR operation unit finishes performing the XOR operation on the data of a processing set, it outputs an XOR operation result to the OR operation unit to perform OR operation so as to obtain a check result.

The invention discloses an improved hybrid Freeman/Eigenvalue decomposition method, and the method comprises the steps: obtaining a complete polarization SAR data coherence matrix, and carrying out the filtering; judging a dominant scattering mechanism at a pixel point in the fully polarimetric SAR data; calculating the surface scattering power, the secondary scattering power and the volume scattering power of the pixel point according to the judgment result of the dominant scattering mechanism; and obtaining a decomposed RGB composite image. According to the invention, the phenomenon of negative power generated by volume scattering power over-estimation, surface scattering and secondary scattering can be effectively solved; different volume scattering models are selected for a natural target area and an artificial target area, and a generalized volume scattering model is introduced for the natural target area, so that the problem that the volume scattering model of the traditional decomposition method is limited and cannot always meet the actual situation is solved. According to the method, a more accurate target scattering characteristic decomposition graph can be obtained, and more accurate classification categories can be obtained in ground object type classification.