摘要:
An apparatus and method capable of programmably delaying a clock of a memory. The apparatus and method utilize the BIOS, external electric switches or other logic devices to selectively delay the clock of the DRAM and/or the internal clock of the north bridge, by which the DRAM has enough setup time at the rising edge of work clock to correctly read out the command word. The north bridge can then correctly receive data from the DRAM module and transfer the data to the CPU or AGP. Therefore, the memory can function normally even if the memory is operated at high speed or with heavy loading.
摘要:
A buffer for varying data access speed. Combining the buffer with a memory such as a double data rate synchronous dynamic random access memory, the data transmission rate of a memory system can be enhanced. The buffer is coupled with a control chip set and several memory modules to provide functions of data analysis and assembly to satisfy a two-way data transmission interface and to obtain a higher data transmission rate. The buffer also has the function of isolating the electric connection between two sides. A single signal interface from a memory module can be converted to a complementary source synchronous signal by the buffer, so that a high-speed data transmission can be achieved. A memory system can apply several of such buffers to achieve an even higher data transmission speed.
摘要:
A memory-access management method and system is provided for use with an SDRAM (Synchronous Dynamic Random-Access Memory) or the like, for the purpose of increasing the performance of memory access to the SDRAM by means of tracking the memory-access history of previous access operations. The memory-page management system includes a page-table register unit including a page table for storing a predefined number of recently accessed memory locations of the memory unit. Further, the memory-page management system includes a comparison unit capable of, in response to each access request to the memory unit, checking whether the requested memory location is a hit to any one stored in the page table in the page-table register unit. A utilization-rate register unit is coupled to the page-table register unit for monitoring the least-recently-used records stored in the page-table register unit; and moreover, a validity-checking unit is coupled to the page-table register unit for checking whether the address data stored in the page table in the page-table register unit is valid or invalid.
摘要:
A method for a CPU interface to control a writing process that writes data sent from a CPU to a memory. The CPU interface controls the writing process through steps mainly including receiving a write request and data from a CPU, sending a dummy request to the memory control circuit of the memory circuit, and then writing the data to a memory of the memory circuit. After the CPU interface receives a write request from the CPU, the CPU interface sends a dummy request to the memory control circuit to pre-charge and activate the designative memory page of the memory circuit before the data is sent to the memory circuit. Since the designative memory page is always pre-charged and activated while the data is received at the memory control circuit, the memory control circuit sends only a write command to the memory for writing the data to the memory without further pre-charging and activating the designative memory page. Therefore, the total number of clock cycles required for processing a write request is shortened.
摘要:
A data accessing command integration method includes the following steps. Firstly, M data accessing commands are sequentially received through a bus, wherein N data accessing commands contained in the M data accessing commands have the same command type and comply with a sequential address relationship. Next, the N data accessing commands are re-ordered according to the addressing sequence, so that a first data corresponding to the re-ordered N data accessing commands are sequentially accessed in the data memory.
摘要:
A memory access control method and system is provided for use on a computer system to control the memory access operation by a central processing unit (CPU) to a memory unit in a more efficient manner than the prior art. This memory access control method and system is characterized by, for each read request from the CPU, the prompt transfer of the corresponding internal read-request signal to the memory control unit, right after it is issued and without waiting until the CPU issues the L1 write-back signal of the current read request. If the current read request is a hit to the cache memory, a read-stop signal is promptly issued to stop the current read operation on the memory unit, and then a cache write-back operation is performed to write the cache data back into the memory unit. This method and system can help reduce the period of waiting states by the CPU, thus increasing the overall memory access performance by the CPU and the overall system performance of the computer system.
摘要:
A method for performing block management is provided. The method is applied to a controller of a Flash memory, where the Flash memory includes a plurality of blocks. The method includes: adjusting a dynamic threshold according to at least one condition; and comparing a valid/invalid page count of a specific block of the plurality of blocks with the dynamic threshold to determine whether to erase the specific block. An associated memory device and a controller thereof are also provided, where the memory device includes the Flash memory and the controller. In particular, the controller includes a read only memory (ROM) arranged to store a program code, and further includes a microprocessor arranged to execute the program code to control access to the Flash memory and manage the plurality of blocks, where under control of the microprocessor, the controller operates according to the method.
摘要:
The invention provides a method for handling data updating of a flash memory. In one embodiment, the flash memory comprises a mother block comprising a plurality of updated pages to be updated. First, a spare block, recording no data, is popped as a file allocation table (FAT) block corresponding to the mother block. Data for updating the updated pages of the mother block is then written to a plurality of replacing pages of the FAT block. Finally, a plurality of mapping relationships between the replacing pages and the updated pages are recorded in a page mapping table stored in the FAT block.
摘要:
A hybrid flash memory device and a control method of the hybrid flash memory device are provided. The hybrid flash memory device includes a micro controller connected to a host bus for receiving data to be written in the hybrid flash memory device from a host via the host bus; and a memory module coupled to the micro controller. The flash module includes a first type of flash memory and a second type of flash memory. The data are determined to be written in a first log block of the first type of flash memory when the data size is not greater than a predetermined data size. On the contrary, the data are determined to be written in a second log block of the second type of flash memory when the data size is greater than the predetermined data size.
摘要:
In an application system of a liquid crystal display, for protecting transmissions between a master terminal and a slave terminal, effects caused by an unstable power source of the slave terminal have to be reduced to a lowest degree. When the application system is reset or under normal operations with the power source having a suddenly-decreased or suddenly-unstable voltage level, the transmission between the master terminal and the slave terminal have to be terminated, and related data of the terminated transmission is temporarily stored. When the voltage of the slave terminal is confirmed to reach to a stable voltage over a predetermined duration, the transmission may be restored by the stored data.