Direct internal memory access system for interface of internet small-sized computer system

A small computer, memory access technology, applied in the direction of transmission systems, electrical components, instruments, etc., can solve the problem of increased number of DMA system interrupts, etc., to reduce the time to read memory and wait for processing time, reduce time, improve speed and The effect of potency

Inactive Publication Date: 2007-01-31
IND TECH RES INST
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  • Summary
  • Abstract
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Problems solved by technology

[0006] In addition, the conventional technology assumes that data only exists in a single data buffer (data buffer), and if the data has multiple blocks, the number of interruptions of the DMA system will increase

Method used

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  • Direct internal memory access system for interface of internet small-sized computer system
  • Direct internal memory access system for interface of internet small-sized computer system
  • Direct internal memory access system for interface of internet small-sized computer system

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Embodiment Construction

[0014] refer to figure 1 , which shows a schematic diagram of the direct memory access system for Internet Small Computer System Interface (iSCSI) of the present invention. The present invention is used for the direct memory access system 10 of Internet small computer system interface and comprises: a first bus interface 11, a second bus interface 12, a FIFO memory 13, an iSCSI cyclic redundancy code (CRC) module 14 and a direct memory access (DMA) controller 15 . The first bus interface 11 is a host computer (Host) bus interface. The second bus interface 12 is an Application Specific Integrated Circuit (ASIC) bus interface.

[0015] The first-in-first-out memory (First-In-First-Out Memory) 13 is connected to the first bus interface 11 and the second bus interface 12 . The first-in-first-out memory 13 includes a plurality of memory unit groups, each memory unit group includes a write-in memory unit and a read-out memory unit, and the write-in memory unit is used to store da...

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Abstract

The invention relates to a directly memory accessing system used in internet microcomputer system interface. It includes a first bus interface, a second bus interface a FIFO memory, an iSCSI cycling redundant code module and a directly accessing controller. The iSCSI cycling redundant code module is embedded in directly accessing system to supply iSCSI protocol and TCP / IP protocol data transferring interface. While accessing iSCSI protocol data unit, the iSCSI cycling redundant code would be automatically calculated and update digest of iSCSI protocol data unit. Thus, using the invention could lower the load of CPU and decrease the time of repeatedly reading iSCSI protocol data unit to improve the speed and efficiency of processing iSCSI cycling redundant code.

Description

technical field [0001] The invention relates to a direct memory access system, in particular to a direct memory access system for Internet Small Computer System Interface (iSCSI). Background technique [0002] Internet Small Computer System Interface (iSCSI) is a new storage network technology and transmission protocol. The main function of this transport protocol is to transmit SCSI commands and data through the iSCSI protocol data unit (PDU) on the currently developed IP network. Therefore, through the iSCSI protocol, the IP network can also become a storage network. [0003] The biggest advantage of using an IP network as a storage network is that for users, they only need to replace their servers and storage devices with iSCSI interfaces and use the original IP network switching devices to build a low-cost and high-quality system. storage network. [0004] According to the load analysis of the iSCSI protocol, the transmission and reception load of TCP / IP is the larges...

Claims

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Application Information

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IPC IPC(8): G06F13/28H04L29/06
Inventor 吴正毅陈汉强
Owner IND TECH RES INST
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