Shanghai Zhaoxin Semiconductor Co., Ltd.

Qunyi Yang

Tingli Cui

Yang Jiao

Xinglin Gui

Jin Xiang

Fan Yang

Peng Shen

Hui Wu

An electronic device includes remapping hardware, a processor, and a Northbridge IC. The remapping hardware converts a virtual address included in an unconverted DMA request into a physical address. The processor executes software to configure the remapping hardware. The Northbridge IC sends the physical address to the processor. When the software changes the configuration of the remapping hardware, the remapping hardware outputs a data draining request to the Northbridge IC. When the Northbridge IC receives the data draining request at a first time, the Northbridge IC suspends unconverted DMA requests after the first time until a second time, and outputs a first data draining response to the remapping hardware at the second time. The remapping hardware receives the first data draining response and notifies the processor that the data draining request has been completed.

Electronic device and method for co-operating software and hardware

An electronic device is provided. The electronic device includes a memory and an integrated circuit. The integrated circuit includes an address remapping unit. The memory includes multiple memory pages. The integrated circuit converts multiple virtual addresses into multiple physical addresses in sequence. The address remapping unit prefetches a first physical address corresponding to a first virtual address if a second virtual address exceeds a preset offset. The first virtual address is in a different memory page from the second virtual address. The second virtual address is currently processed. The multiple virtual addresses include the first and second virtual addresses.

Electronic device and method for accelerating memory access

A method for remapping a virtual address to a physical address is provided. The method is used in an address remapping unit and includes: receiving, by a remapping processing unit of the address remapping unit, a remapping request, decoding the remapping request and determining whether the remapping request has a direct memory access (DMA) remapping request; and executing, by the remapping processing unit, a remapping procedure: translating a virtual address corresponding to the remapping request to a physical address, when the remapping request has the DMA remapping request.

Method for remapping virtual address to physical address and address remapping unit

An acceleration technology for accessing system memory, which provides translation agent hardware that calculates the physical address of the system memory based on an access request issued from the device end. The translation agent hardware has a cache memory that stores information to speed up the calculation of the physical address. Each cache line corresponds to a last-recently used (LRU) index value, and the cache line with the greatest LRU index value is preferentially released to be reassigned. A counter counts a count value to show an isochronous caching demand. LRU index values of cache lines assigned to non-isochronous caching are kept not lower than the count value, and thereby isochronous caching takes precedence over non-isochronous caching.

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Beijing, China

Qunyi Yang