為了實(shí)現(xiàn)把軟件仿真的數(shù)據(jù)通過PCI總線DMA傳輸、處理后轉(zhuǎn)換成高速視頻串行數(shù)據(jù)流（LVDS數(shù)據(jù)流），設(shè)計(jì)出了基于PCI9054的數(shù)據(jù)轉(zhuǎn)換模塊。通過介紹PCI總線接口協(xié)議芯片PCI9054的性能、特點(diǎn)，分析了windows的WDM驅(qū)動(dòng)程序的特點(diǎn)，在軟硬件設(shè)計(jì)中采用把數(shù)據(jù)緩存器設(shè)置為兩組SRAM的結(jié)構(gòu)，兩組SRAM交替進(jìn)行數(shù)據(jù)存取的方式，有效克服了數(shù)據(jù)流不連續(xù)的現(xiàn)象，解決了形成不間斷數(shù)據(jù)流和兩次DMA傳輸之間的數(shù)據(jù)間斷問題。應(yīng)用結(jié)果表明，該設(shè)計(jì)可滿足數(shù)字視頻帶寬20 MHz以內(nèi)的LVDS數(shù)據(jù)流的轉(zhuǎn)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.