Circuit and method for encoding data and data recorder

Abstract

To provide a data encoding circuit capable of securing real-timeness of a recording operation even in a memory of a low operation clock frequency by reducing the number of times of accessing the memory, and simultaneously reducing power consumption and memory costs. Prior to its writing in a memory ( 101 ), data from a host is input to an EDC arithmetic operation circuit ( 110 ) and a scrambling arithmetic operation circuit ( 111 ) to be processed, and then the error correction codes are added to the data written in the memory ( 101 ) from the scrambling arithmetic operation circuit ( 111 ) by a PI arithmetic operation circuit ( 104 ) and a PO arithmetic operation circuit ( 105 ). Accordingly, it is possible to omit memory access when the data is written from the host in the memory, and memory access when the data is read from the memory to the EDC arithmetic operation circuit. Thus, it is possible to reduce an operation clock frequency of the memory ( 101 ).

Description

technical field [0001] The present invention relates to a circuit and method for data encoding and data recording, especially, the present invention is suitable for the case where an error correction code is added by product encoding in row (PI) direction and column (PO) direction. Background technique [0002] When data is recorded in a digital versatile disc (DVD), an error correction code is added to each ECC unit. This error correction is performed using product coding. Error correction codes in the row (PI) direction and column (PO) direction are added to each ECC unit distributed in the memory. [0003] Image 6 It shows the structure of an ECC unit with error correction code added. As shown in the figure, one ECC unit includes data of 208 rows and 181 columns. PO codes and PI codes are added to rows 192 to 208 and columns 172 to 181, respectively. Wherein, the PI code is the data added to each row (data forming a sector), and the PO code is the data added to each ...

AI Technical Summary

Problems solved by technology

[0026] However, such high clock frequency memory is expensive

Therefore, when such a memory is mounted on a DVD recorder or the like, there is a problem of cost

In addition, another problem brought about by the high operating clock frequency of the memory is to increase the power consumption of the memory

On the other hand, if the operating clock frequency of the memory is lowered, the encoding cannot be completed on time, causing concerns that the recording operation may lose real-time performance.

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