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A major limitation of NAND flash memory is erase-before-program characteristics. It incurs write amplification, severely degrading system performance and endurance. Previous works reveal that metadata update substantially contributes to write amplification in object-based NAND flash device (ONFD). To further reduce the overhead of metadata update in ONFD, we propose a hybrid buffer scheme (HBS) by...
Write amplification is a major cause of performance and endurance degradations in NAND flash based storage systems. In an object-based NAND flash device, two causes of write amplification are onode partial update and cascading update. Updating one onode, a kind of small-sized object metadata, invokes partial page update (i.e., onode partial update) that incurs unnecessary migration of the un-updated...
In this paper, an efficient VLSI architecture of JPEG2000 encoder is given. The proposed architecture functionally consists of three main parts: discrete wavelet transform (DWT), block encoder (i.e., known as embedded block coding with optimized truncation (EBCOT), which is combined with bitplane coder, MQ coder and rate-distortion (RD) truncation) and memory management unit (MMU). For DWT, high-performance...
In this paper, a memory-efficient and high-throughput VLSI architecture, which functionally includes discrete wavelet transform (DWT) and entropy coder (EC), is presented for JPEG2000 implementation. The proposed architecture is made up of line-based DWT using lifting scheme combined with the EC architecture performed in a bit plane parallel coding way. Based on this, an efficient memory strategy...
A compression algorithm based on partial SPIHT with classified weighted rate-distortion optimization and adaptive coding depth control is proposed. The different significance weights are initially given to every coding passes in each zero tree, according to the category of interferential regions and the significance of coding bitplanes. Then we determine the coding depth of each zero tree by significance...
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