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Data processor

A data processor and data technology, applied in electrical digital data processing, data exchange networks, instruments, etc., can solve problems such as the inability to improve the running speed, the reduction of transmission efficiency, and the error detection.

Inactive Publication Date: 2006-01-18
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the running speed cannot be improved
[0031] 2. Reduced transmission efficiency due to delays in error detection and error correction
As a result, the performance of the entire system degrades

Method used

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Experimental program
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Embodiment Construction

[0059] In the drawings, the same numerals denote the same elements.

[0060] Figure 8 is a schematic block diagram showing the data processor (USB device) 12 according to the first embodiment of the present invention. The USB 13 connects the USB device 12 to a host computer 11 (hereinafter referred to as a USB host) that manages USB communication. The USB device 12 is connected to the USB host (personal computer) 11, and is, for example, used for a hard disk, a magneto-optical (MO) disk, a digital versatile disk (DVD), a compact disk (CD), etc. or a peripheral device such as a printer or ATA / ATAPI (ATA Packet Interface) device for the scanner. Figure 8 A portion of the USB device 12 is shown serving as a packet identification unit.

[0061] The USB device (packet identification unit) 12 includes an SIE 21, a PID decoder 22 serving as a packet decision circuit, a packet length measurement circuit 23, first to third packet inspection circuits 24 to 26, and a plurality (only...

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PUM

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Abstract

A data processor is used for the intercourse data communication with a main computer through an interface. The data processor is characterized in that the data processor includes: a plurality of endpoints (55-57) for processing affairs which are corresponding to the data transmission request from the main computer, wherein, every endpoint stores data conversion bits for inversing the values of the data conversion bits whenever receiving the predetermined grouping from the main computer; a conversion bit switching circuit (54) which is connected with every endpoint and judges that whether a first endpoint that receives the transmission request in the prior affairs is identical with a second endpoint that receives the transmission request in present affairs. When the first endpoint is different from the second endpoint, the conversion bit switching circuit inverts the values of the data conversion bits that are stored in the first endpoint.

Description

[0001] This application is a divisional application of the patent application submitted on August 27, 2003, with the application number 03155961.1 and the title of the invention "data processor, group identification method and error correction method". technical field [0002] The invention relates to a data processor, in particular to a data processor for data communication with a host computer through a USB interface. Background technique [0003] The Universal Serial Bus (USB) is a serial interface that has been widely used for communication between a computer having a host function (eg, a personal computer) and peripheral devices connected to the computer. When performing communication using USB between a PC (hereinafter referred to as a USB host) and a peripheral device (hereinafter referred to as a USB device), it is necessary to detect errors in an initial state to efficiently transfer data. [0004] Data transfers using USB are generally performed in transfer units c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F13/42H04L12/56H04L12/28H04L1/00H04L1/18H04L29/06
CPCH04L1/1803H04L1/0061H04L1/1867H04L1/08H04L1/0083
Inventor 青嶋一浩
Owner FUJITSU LTD