本文選題：HDMI　切入點(diǎn)：TMDS　出處：《西安電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：本文首先闡述了計(jì)算機(jī)視頻信息防泄漏的發(fā)展以及其重要性。然后重點(diǎn)介紹了TEMPEST技術(shù)的研究背景、發(fā)展歷程以及國(guó)內(nèi)外的研究現(xiàn)狀。最后在這些背景和理論基礎(chǔ)下,確定了本文總體的研究思路�；贖DMI數(shù)字視頻信息特征以及截獲原理設(shè)計(jì)出了數(shù)字視頻信息防泄漏的硬件系統(tǒng)——在屏蔽計(jì)算機(jī)箱內(nèi)部添加視頻信息處理板,從而構(gòu)成了一個(gè)視頻信息防泄漏系統(tǒng)。接下來(lái)本文分析了HDMI視頻系統(tǒng)的主要構(gòu)成和工作原理。因?yàn)镠DMI是基于轉(zhuǎn)換最小差分信號(hào)TMDS編碼原理實(shí)現(xiàn)的,所以對(duì)TMDS編碼特性、信號(hào)特征和數(shù)據(jù)傳輸也有介紹。最后介紹了市面上存在的HDMI接口系統(tǒng)。根據(jù)系統(tǒng)需求確定了視頻處理板的性能指標(biāo),根據(jù)處理板系統(tǒng)的傳輸視頻類型以及處理速度等問(wèn)題,制定了以FPGA為處理核心的硬件實(shí)現(xiàn)方案。然后再考慮了性能和成本等因素,對(duì)硬件系統(tǒng)中TMDS解碼模塊、TMDS編碼模塊、PROM模塊、配置芯片和電源芯片等主要芯片進(jìn)行選型以及對(duì)相應(yīng)的外圍電路進(jìn)行設(shè)計(jì)。在系統(tǒng)原理圖設(shè)計(jì)完成后,接下來(lái)就要進(jìn)行處理板PCB的設(shè)計(jì)。首先制定了硬件處理板的設(shè)計(jì)流程來(lái)指導(dǎo)PCB的設(shè)計(jì)。在PCB布局布線之前,就要對(duì)其可能出現(xiàn)的信號(hào)完整性問(wèn)題,如視頻數(shù)據(jù)傳輸線的反射、串?dāng)_等進(jìn)行分析和仿真,根據(jù)仿真結(jié)果對(duì)有關(guān)數(shù)據(jù)傳輸線的走線進(jìn)行指導(dǎo)。同時(shí)針對(duì)PCB的電源完整性問(wèn)題,分析了去耦電容的去耦原理,并且根據(jù)電源目標(biāo)阻抗對(duì)具體添加電容的數(shù)量及容值進(jìn)行計(jì)算,然后再通過(guò)實(shí)際的仿真,確定了具體的電容值和數(shù)量,最后根據(jù)去耦電容的去耦半徑完成去耦電容的擺放。隨后對(duì)整個(gè)的處理板的電磁兼容設(shè)計(jì)進(jìn)行了介紹,通過(guò)對(duì)電源的EMC設(shè)計(jì)和靜電放電設(shè)計(jì)來(lái)保障其電磁兼容標(biāo)準(zhǔn)。在PCB的最終設(shè)計(jì)階段,根據(jù)布局布線的理論指導(dǎo)一些經(jīng)驗(yàn)法則,完成了整個(gè)處理板PCB的布局布線設(shè)計(jì)。最后,對(duì)處理板設(shè)計(jì)的功能性和可靠性進(jìn)行頻譜測(cè)試和驗(yàn)證。根據(jù)測(cè)試的結(jié)果和硬件系統(tǒng)實(shí)現(xiàn)過(guò)程中出現(xiàn)的問(wèn)題提出了進(jìn)一步的研究思路。
[Abstract]:In this paper, firstly, the development and importance of computer video information leakage prevention are described. Then, the research background, development history and domestic and foreign research status of TEMPEST technology are introduced. Based on the characteristics of HDMI digital video information and the principle of interception, the hardware system of digital video information leakage prevention is designed. Then, this paper analyzes the main structure and working principle of HDMI video system. Because HDMI is realized based on the principle of TMDS coding of converted minimum differential signal, the characteristics of TMDS coding are analyzed. The signal characteristics and data transmission are also introduced. Finally, the existing HDMI interface system is introduced. The performance index of the video processing board is determined according to the system requirements, and the transmission video type and processing speed of the processing board system are also discussed. A hardware implementation scheme with FPGA as the processing core is made. Then, considering the factors such as performance and cost, the TMDS decoding module and the prom module in the hardware system are introduced. The main chips such as configuration chip and power chip are selected and the corresponding peripheral circuits are designed. The next step is to design the processing board PCB. Firstly, the design flow of the hardware processing board is developed to guide the design of the PCB. Before the PCB layout and wiring, the possible signal integrity problems, such as the reflection of the video data transmission line, are discussed. The crosstalk is analyzed and simulated, and the data transmission line is guided according to the simulation results. At the same time, the decoupling principle of decoupling capacitor is analyzed in view of the power integrity of PCB. And according to the power target impedance to calculate the specific added capacitance and capacity, and then through the actual simulation, determine the specific capacitance value and quantity, Finally, according to the decoupling radius of the decoupling capacitor, the decoupling capacitance is arranged. Then, the electromagnetic compatibility design of the whole processing board is introduced. The EMC design and electrostatic discharge design of the power supply are used to guarantee the EMC standard. In the final design phase of PCB, the layout and wiring design of the whole processing board PCB is completed according to the theory of layout and wiring. The function and reliability of the processing board are tested and verified by spectrum test. Based on the results of the test and the problems in the implementation of the hardware system, the further research ideas are put forward.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN919.81

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