【摘要】：彈性緩沖技術(shù)廣泛應(yīng)用于高速接口的接收端,通過(guò)同步輸入輸出的數(shù)據(jù)、補(bǔ)償時(shí)鐘偏差來(lái)保證數(shù)據(jù)的正確傳輸。而傳統(tǒng)彈性緩沖器通過(guò)寫(xiě)指針跳躍和斷點(diǎn)保存來(lái)添加特定字符(SKP)。這種方法容易帶來(lái)復(fù)雜的異步控制電路,產(chǎn)生數(shù)據(jù)接收紊亂等狀況。另外,高速接口對(duì)于這種單指針讀寫(xiě)的彈性緩沖器有很高的頻率要求,容易產(chǎn)生復(fù)雜的時(shí)序問(wèn)題。本論文通過(guò)分析彈性緩沖技術(shù)的工作原理和方法,提出了多指針彈性緩沖器設(shè)計(jì)方法。它通過(guò)四個(gè)讀寫(xiě)指針尋址完成數(shù)據(jù)的輸入和輸出,并將添加、刪除操作分開(kāi)在不同的時(shí)鐘域(寫(xiě)指針尋址完成SKP刪除,讀指針尋址完成SKP添加),來(lái)避免復(fù)雜異步控制電路的出現(xiàn)。本文所做的工作如下(1)首先介紹了傳統(tǒng)彈性緩沖器的工作原理和工作區(qū)域,分析了傳統(tǒng)彈性緩沖器在添加和刪除SKP時(shí)讀寫(xiě)指針的操作方法。并針對(duì)此方法帶來(lái)的時(shí)序問(wèn)題,提出了一種新的多指針彈性緩沖器。(2)然后以USB3.0協(xié)議為標(biāo)準(zhǔn),詳細(xì)說(shuō)明了多指針彈性緩沖器的工作原理及讀寫(xiě)指針的操作方法。多指針彈性緩沖器工作時(shí),首先利用輸入控制單元改變輸入數(shù)據(jù)中SKP對(duì)的排序,輸出控制單元改變輸出的數(shù)據(jù);其次在閾值檢測(cè)單元中檢測(cè)彈性緩沖器中的有效數(shù)據(jù)量是否達(dá)到添加或刪除的閾值,發(fā)出有效指令到讀寫(xiě)指針控制單元;最后通過(guò)控制四個(gè)讀寫(xiě)指針尋址來(lái)添加和刪除數(shù)據(jù)中的SKP,維持彈性緩沖器的半滿狀態(tài)。(3)最后,本文通過(guò)仿真軟件Quartus和Modelism對(duì)多指針彈性緩沖器做了時(shí)序仿真,并且將程序下載到FPGA開(kāi)發(fā)板中,用邏輯分析儀觀察波形。實(shí)驗(yàn)結(jié)果表明所設(shè)計(jì)的彈性緩沖器可正確實(shí)現(xiàn)SKP的添加和刪除功能,且時(shí)鐘頻率能夠滿足USB3.0的協(xié)議要求。
[Abstract]:Elastic buffer technology is widely used in the receiver of high speed interface. By synchronizing the input and output data, the clock deviation is compensated to ensure the correct transmission of the data. Traditional elastic buffers add a specific character (SKP). By writing pointer hopping and breakpoint saving This method can easily lead to complex asynchronous control circuit, resulting in data reception disorder and so on. In addition, the high speed interface has high frequency requirement for this kind of elastic buffer for single pointer reading and writing, and it is easy to produce complex timing problems. In this paper, the principle and method of elastic buffer are analyzed, and the design method of multi-pointer elastic buffer is put forward. It accomplishes the input and output of data by addressing four read and write pointers, and adds, deletes operations in different clock fields (write pointer addressing completes SKP deletion, Read pointer addressing completes SKP addition) to avoid complex asynchronous control circuits. The work done in this paper is as follows: (1) the working principle and working area of the traditional elastic buffer are introduced, and the operation method of the traditional elastic buffer when adding and deleting SKP is analyzed. A new multi-pointer elastic buffer is proposed. (2) based on the USB3.0 protocol, the working principle of the multi-pointer elastic buffer and the operation method of reading and writing pointers are explained in detail. When the multi-pointer elastic buffer works, the input control unit is used to change the sort of the SKP pair in the input data, and the output control unit changes the output data. Secondly, in the threshold detection unit, it detects whether the effective data in the elastic buffer reaches the added or deleted threshold, and sends out the effective instruction to the read / write pointer control unit. Finally, the SKP, in the data is added and deleted by controlling four read-write pointer addressing to maintain the half-full state of the elastic buffer. (3) finally, the simulation software Quartus and Modelism are used to simulate the timing of the multi-pointer elastic buffer. And download the program to the FPGA development board, using the logic analyzer to observe the waveform. Experimental results show that the designed elastic buffer can correctly add and delete SKP, and the clock frequency can meet the requirements of USB3.0 protocol.
【學(xué)位授予單位】：安徽大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TP334.7;TN791

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本文編號(hào)：2261391