摘要:
An embodiment provides a virtual address cache memory including: a TLB virtual page memory configured to, when a rewrite to a TLB occurs, rewrite entry data; a data memory configured to hold cache data using a virtual page tag or a page offset as a cache index; a cache state memory configured to hold a cache state for the cache data stored in the data memory, in association with the cache index; a first physical address memory configured to, when the rewrite to the TLB occurs, rewrite a held physical address; and a second physical address memory configured to, when the cache data is written to the data memory after the occurrence of the rewrite to the TLB, rewrite a held physical address.
摘要:
A processor has an ALU, a load/store unit, a timer, an ECC calculator, and a plurality of ECC registers. When the load/store unit writes data in a main memory, the load/store unit writes written data and a count value of a timer in the main memory, and sets ECC status flag which indicates that an ECC about the written data is not correct in the main memory, and causes the ECC calculator to calculate the ECC about the written data after setting the ECC status flag, and writes the calculated ECC in the main memory and resets the ECC status flag after the ECC is calculated.
摘要:
A cache memory control circuit has a plurality of counters, each of which is provided per set and per memory space and configured to count how many pieces of data of a corresponding memory space is stored in a corresponding set. The cache memory control circuit controls activation of a tag memory and a data memory of each of a plurality of sets according to a count value of each of the plurality of counters.
摘要:
A memory controller adds dummy data to write data by referring to instruction information about a descriptor transfer of the write data if a size of the write data to be written according to a data-write request information does not match a page size unit, thereby adjusting the size of the write data to the page size unit and then outputs the write data.
摘要:
A data processing system includes: a cache memory comprising a plurality of ways, each of which stores a data line including a data and address information of the data; an analysis module that analyzes whether or not a data requested in a read instruction is to be used in a subsequent instruction to be executed within a predetermined time period after the execution of the read instruction is started; a mode selection module that selects one of a plurality of access modes for accessing the cache memory based on a result of the analysis module; and an access unit that accesses the cache memory in the selected one of the access modes when the read instruction is executed.
摘要:
A microprocessor includes: a processor core that performs pipeline processing; an instruction analyzing section that analyzes an instruction to be processed by the processor core and outputs analysis information indicating whether the instruction matches with a specific instruction; and a memory that temporary stores the instruction with the analysis information, wherein the processor core includes: an instruction fetch unit that fetches the instruction stored in the memory; an instruction decode unit that decodes the instruction fetched by the instruction fetch unit; an instruction execute unit that executes the instruction decoded by the instruction decode unit; and a specific instruction execute controller that reads out the analysis information stored in the memory and controls operation of at least one of the instruction fetch unit and the instruction decode unit when the analysis instruction indicates that the instruction matches with the specific instruction.
摘要:
According to one embodiment, an information processing device includes a first determination section and a setting section. The first determination section determines inconsistency between first data and second data. The first data is stored in a nonvolatile semiconductor memory. The second data is corresponding to the first data and stored in a semiconductor memory. The setting section sets execution timing of write back based on access frequency information associated with the second data.
摘要:
An embodiment provides a virtual address cache memory including: a TLB virtual page memory configured to, when a rewrite to a TLB occurs, rewrite entry data; a data memory configured to hold cache data using a virtual page tag or a page offset as a cache index; a cache state memory configured to hold a cache state for the cache data stored in the data memory, in association with the cache index; a first physical address memory configured to, when the rewrite to the TLB occurs, rewrite a held physical address; and a second physical address memory configured to, when the cache data is written to the data memory after the occurrence of the rewrite to the TLB, rewrite a held physical address.
摘要:
A data processing system includes: a cache memory comprising a plurality of ways, each of which stores a data line including a data and address information of the data; an analysis module that analyzes whether or not a data requested in a read instruction is to be used in a subsequent instruction to be executed within a predetermined time period after the execution of the read instruction is started; a mode selection module that selects one of a plurality of access modes for accessing the cache memory based on a result of the analysis module; and an access unit that accesses the cache memory in the selected one of the access modes when the read instruction is executed.
摘要:
A multi-processor system has a plurality of processor cores, a plurality of level-one caches, and a level-two cache. The level-two cache has a level-two cache memory which stores data, a level-two cache tag memory which stores a line bit indicative of whether an instruction code included in data stored in the level-two cache memory is stored in the plurality of level-one cache memories or not line by line, and a level-two cache controller which refers to the line bit stored in the level-two cache tag memory and releases a line in which data including the same instruction code as that stored in the level-one cache memory is stored, in lines in the level-two cache memory.