| 高档PC机的DMA传输技术及其在数据采集中的应用 |
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| 引用本文： | 冯焕清,周荷琴.高档PC机的DMA传输技术及其在数据采集中的应用[J].数据采集与处理,1997,12(1):40-44. |
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| 作者姓名： | 冯焕清 周荷琴 |
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| 作者单位： | [1]中国科技大学电子技术部 [2]中国科技大学自动化系 |
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| 摘 要： | ＤＭＡ传输是实现高速数据采集的重要手段，在高档ＰＣ机上用ＤＭＡ方法当采集数据时，将面临若干的保护模式下控制ＤＭＡ传输的新问题，如ＤＭＡ缓冲区物理地址的计算，ＤＭＡ缓冲区地址的不连续，虚存导致的传输失败和高速缓存引起数据的丢失等，本文讨论解决它们的方法，并介绍在ＤＯＳ环境下保护模式ＤＭＡ数据采集程序的编写技巧。
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| 关 键 词： | 数据采集 DMA传输 保护模式 微机 |
DMA Transfer on High-Performance PC Machines and Its Application for Data Acquisition |
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| Feng Huanqing,.DMA Transfer on High-Performance PC Machines and Its Application for Data Acquisition[J].Journal of Data Acquisition & Processing,1997,12(1):40-44. |
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| Authors: | Feng Huanqing |
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| Abstract: | Direct Memory Access(DMA) is an important approach to realize the high-speed data acquisition. The users of high-performance PC machines will face some problems in data acquisition by using DMA technology under CPU's protected mode, for instance, the calculation of physical address of DMA buffer, the discontinuity of DMA address, failed transfer caused by virtual memory manager and the data overwritten by memory caching. This paper discusses the methods to solve these problems and presents the programming idea for data acquisition by using DMA under the protected mode. |
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| Keywords: | data acquisition computer applications DMA transfer protected mode virtual DMA service |
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