為了實現把軟件仿真的數據通過PCI總線DMA傳輸、處理后轉換成高速視頻串行數據流（LVDS數據流），設計出了基于PCI9054的數據轉換模塊。通過介紹PCI總線接口協議芯片PCI9054的性能、特點，分析了windows的WDM驅動程序的特點，在軟硬件設計中采用把數據緩存器設置為兩組SRAM的結構，兩組SRAM交替進行數據存取的方式，有效克服了數據流不連續的現象，解決了形成不間斷數據流和兩次DMA傳輸之間的數據間斷問題。應用結果表明，該設計可滿足數字視頻帶寬20 MHz以內的LVDS數據流的轉換與傳輸。

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Abstract:

?In order to transform the data which was simulated in software， transferred and processed by PCI bus into high-speed video serial data flow（LVDS data flow）， the data transform module based on PCI9054 was designed. The performances and characteristics of the PCI9054， a typical PCI Bus I/O chip， were introduced and the characteristics of the WDM driver were analyzed. In the hardware and software design，the data memory was set into the structure of two suits of SRAM. The way that the data was read by two suits of SRAM alternately overcome the phenomenon of incontinuous data flow， and solve the problem of continuous data flow and the data break between two times DMA transmision. The practical results indicate that this design can satisfy the conversion and transfers of LVDS data in 20MHz digital video bandwidth.