1. A device for video decoding, comprising: a pipeline scheduler selectively scheduling among multiple decoding syntaxes and controlling an inner part of one of the decoding syntaxes; a decoding core, comprising a look ahead parsing detector with analysis conditions, if the analysis conditions are met, one more symbol is decoded during one period; a segmented context memory, making the pipeline scheduler read and write in a memory at the same time; and a cache context register, previously reading a context data, and cooperating with the segmented context memory to manage a context memory.