A system that connects multiple storage devices based on a single target device number

A storage device and target device technology, applied in the input/output process of data processing, instruments, electrical digital data processing, etc., can solve problems such as occupying CPU, affecting the overall performance of the system, and occupying CPU resources.

Inactive Publication Date: 2002-11-13
同方知网数字出版技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the IDE device works in PIO mode, the system CPU has to perform all related I / O operations for the IDE device, so it takes up a lot of CPU time and greatly affects the overall performance of the system; even when the IDE device works in DMA mode, Because the establishment process of the handshake protocol is still in the PIO mode, the CPU still needs to prepare a lot of I / O operations for it, which takes up CPU resources.

Method used

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  • A system that connects multiple storage devices based on a single target device number
  • A system that connects multiple storage devices based on a single target device number
  • A system that connects multiple storage devices based on a single target device number

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Embodiment Construction

[0023] A method for connecting a plurality of IDE devices under a single SCSI target device of the present invention and an embodiment of a SCSI system integrated with a plurality of IDE devices are described in detail in conjunction with the accompanying drawings as follows:

[0024] The implementation method of this embodiment is to define each logical unit device under a SCSI target device as a physical storage device with an IDE interface, such as a common IDE interface hard disk storage, and a CD-ROM / CD-RW with an IDE interface / DVD drive etc. In this way, 8 logical unit devices under a SCSI target device correspond to 8 IDE storage devices. This method achieves the purpose of expanding the IDE storage device, and the eight IDE storage devices are externally displayed as peripherals with standard SCSI interface characteristics.

[0025] SCSI system realization principle of the present invention is as figure 2shown. It includes a SCSI target device consisting of a prot...

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Abstract

A system for connecting multiple storage devices under single object device is composed of a SCSI object device connected to SCSI bus, a logic unit under the SCSI object device and multiple IDE devices. Said SCSI object device consists of internal bus and its controller, SCSI protocol controller, single-chip processor controller and firware. It can be used for mass storage system with IDE interface such as hard disk tower, optical disk tower and IDE storage array.

Description

technical field [0001] The present invention belongs to the field of computer storage devices. Background technique [0002] In today's computer peripheral memory market, small computer system interface (SCSI: Small Computer System Interface) storage devices and integrated device circuit (IDE: Integrated Drive Electronics) interface storage devices almost occupy the entire market share. The storage device of the IDE interface is especially based on its low-cost connection scheme (under the same storage capacity, the IDE device is 25-40% cheaper than the SCSI device), compatibility (the IDE interface is compatible with the computer bus of the IBM PC / AT structure) ) and ease of use (compared to SCSI devices, IDE storage devices do not require additional control cards, etc.), and become the de facto industry standard in the field of computer peripheral storage. Almost all computer motherboards are equipped with 2 IDE interfaces, which support the connection of 4 IDE storage de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/00G06F13/14
Inventor 裴京肖宇熊瑾珺
Owner 同方知网数字出版技术股份有限公司
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