1304533 半翻修(亨jiL替换買 “部9.·. I -ir τιι m m» nmnnm | 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種高速印刷電路板，特別係指一種可降 低北橋晶片與AGP(Accelerated Graphics Ροή，加速圖形 介面）插槽和S端子（S—Video的簡稱，視頻信號專用輸入輸 出介面）間信號完整性問題發生之高速印刷電路板。 【先前技術】 電子技術的發展使得1C (積體電路）的工作速度越來越 快，頻率越來越高，當信號的互連延遲大於邊沿信號翻轉閾 值b間的20% a寸，PCB(印刷電路板）上信號線就會呈現出傳 輸線效應，即連線不再是顯示集總參數的單純的導線，而是 呈現出分佈的參數效應，這就是高速設計。 隨著半導體工藝的發展，高速設計成爲産品設計中的一 個重要環節，與傳統的設計比較，高速設計要更多地考慮到 信號完整性問題，而高速設計所面臨之過沖（⑽叶讣⑽、 下冲（under shoot)、振鈐（ringing)、延遲和單調性等信 號完整性問題，將成爲傳統設計的一個瓶頸。在高速印刷電 路板上，一條導線已經不再是單純之導線，而須當作傳輸線 看待’按照傳輸線理論來處理。當信號在高速pcB上沿傳輸 線傳輸時遇到阻抗不匹配，將有部分能量從阻抗不連續點沿 傳輸線傳回，造成反射現象。 -=圖爲現有之北橋晶片與AGP插槽和S端子的佈線架 構不思圖，其中北橋晶片1〇通過一條傳輸線12依次連接AG? 插槽20-和S鳊子30。北橋晶片1〇與agp插槽20間之傳輸 線長度爲 3500mils(l_=39· 37mils)，AGP 插槽 20 與 S 端子 3〇間之傳輸線長度爲3000mils。一般情況下，主板上選擇 性的只安裝AGP插槽或只安裝s端子。例如，當主板只安裝 AGP插槽，而s端子空接時，因爲s端子終端開路，阻抗爲 無窮大，因此信號在終端會發生全反射，沿傳輸線Μ原路 1304533 返回，而在AGp插槽2〇上就會 效 第二圖爲s端子处接4 -5虎兀正性問題的出現。 有出彳。唬貝里差，振玲和過沖現象嚴重。 α此，如何提供一種可以有 構，即爲本案所欲解決之課題。场决傳輪線效應之佈線架 【發明内容】 本發明之目的在於提供一插 > 橋晶片與AGP插槽和S料門据Ρ刷電路板中，在北 善信號傳輸性能之佈線架構仏㈣輸線之品質因素、以改 本务明提供一種高速印刷兩枚此 , 插槽及S端子，其中該北橋'型:北橋:曰曰片、似 輪線傳送，並在-連接^八錢橋晶片發出之信號經一傳 長度^ 連到該_插槽和⑼子的傳輸線之 在一 該北橋晶片發出之信號經一傳輸線傳送，並 L連接點處分爲兩條傳輪線分別向AGP插槽和s端子傳 本發明採㈣種τ型拓絲 線架構中之串擾和過沖問題，提高信號之傳傳捕 【實施方式】 太旅日=閱第二圖’ Α本發明了型佈線架構之簡單示意圖。 :產===_構’在—印刷電路板中’北橋晶片 成兩二八經一傳輸線120傳遞，並在一連接，點Α處分 ί^Γ/ 160分別向AGP插槽2〇〇和S端子300傳遞。 傳^ ^ 施貫例中，傳輸線⑽之長度爲5GGmils’ ::線二：⑽之長度均爲3〇〇〇mils。如果在該印刷電路 /、衣。又AGP插槽或s端子中的—個，如當只安裝AGp 1304533 插槽而s端子空接時’從北橋晶片發出之—單位信號沿傳輸 線120傳遞，經過連接點A後又分別沿傳輪線14〇和傳輸線 160傳遞’由於s端子空接，全反射也會向仰插槽_傳 遞，因爲傳輸線140和160之長度對稱相等，故在AGp插槽 上之信號準位爲-個單位。第四圖爲採用了型架構的仿真‘ 形，圖中波形曲線3爲AGP插槽上之理想波形，波形曲線5 馬本貫施例之仿真波形，與現有之佈線架構相比較，振铃和 過沖現象都有了很大之改善，信號質量較好。 理論上而言，最佳之佈線方式是兩條傳輸線14〇, 16〇 =長度要相等，但考慮實際之佈線要求，純留部分設計餘 =故=條傳輸線之差距越小越好，該兩條傳輸線之長度差 :Μ MT公式計算··㈣輸速度/上升時間。在本實施例 最大佈線差距。第三圖中，波形曲線4爲 畜傳輸線160之長度設計爲25〇〇mils時的仿真波形。’ 本發明的第二實施例中，北橋晶片1〇〇産生之作浐 傳遞，仍在連接點A處分成兩條^“ ==輸線卿之長度均爲5〇〇仙。第= 傳輸線12 G之it弟二實施例之仿真波形，與波形曲線5即 160 撲牟槿中= 看出’在該種傳輸線之拓 撲架，中’連接點A越接近AGP插槽⑽，信號之質量 冓還可以酬其他的單驅動單元多 本案技藝之人4·者僅為本發明之較佳實施例，舉凡熟悉 ' ’在发依本發明精神所作之等效修傅或變 13045331304533 Semi-renovation (Heng jiL replacement buy "part 9.. I -ir τιι mm» nmnnm | IX. Description of the invention: [Technical Field] The present invention relates to a high-speed printed circuit board, particularly to a reduction High-speed printed circuit board in which the signal integrity problem between the North Bridge chip and the AGP (Accelerated Graphics Ροή, accelerated graphics interface) slot and the S terminal (short for S-Video, dedicated input/output interface for video signals) occurs. [Prior Art] Electronic Technology The development of 1C (integrated circuit) is faster and faster, and the frequency is higher and higher. When the signal interconnection delay is greater than 20% a inch between the edge signal flip threshold b, the signal on the PCB (printed circuit board) The line will exhibit the transmission line effect, that is, the connection is no longer a simple conductor showing the lumped parameters, but a parameter effect of the distribution, which is a high-speed design. With the development of semiconductor technology, high-speed design becomes a product design. An important part of the high-speed design is to consider the signal integrity problem more than the traditional design. Signal integrity issues such as (10) leafhopper (10), undershoot, ringing, delay, and monotonicity will become a bottleneck in traditional design. On high-speed printed circuit boards, a wire is no longer It is a simple wire, but it must be treated as a transmission line. According to the transmission line theory. When the signal encounters an impedance mismatch when transmitting along the transmission line on the high-speed pcB, some energy will be transmitted back from the impedance discontinuity point along the transmission line, causing reflection. Phenomenon -= The picture shows the wiring structure of the existing North Bridge chip and AGP slot and S terminal. The North Bridge chip 1 is connected to the AG? slot 20- and S die 30 through a transmission line 12. The north bridge chip 1 The length of the transmission line between the 〇 and agp slots 20 is 3500 mils (l_=39·37 mils), and the length of the transmission line between the AGP slot 20 and the S terminal 3 为 is 3000 mils. In general, only the AGP slot is selectively installed on the motherboard. Or only install the s terminal. For example, when the motherboard only installs the AGP slot and the s terminal is empty, because the s terminal is open, the impedance is infinite, so the signal will be totally reflected at the terminal. Line Μ原路1304533 returns, and in the AGp slot 2〇 will be effective. The second picture shows the occurrence of the 4 -5 tiger 兀 positive problem at the s terminal. There is a problem. 唬贝里差,振玲和过The phenomenon of rushing is serious. α This, how to provide a structure that can be solved, that is, the problem to be solved in this case. The wiring frame of the field-breaking wheel effect [invention] The purpose of the invention is to provide a plug-in > bridge chip and AGP Socket and S-gate according to the brush circuit board, in the wiring structure of Beishan signal transmission performance 四 (four) the quality factor of the transmission line, to provide a high-speed printing of two such, slot and S terminal, The North Bridge' type: North Bridge: cymbal, like a round-line transmission, and the signal from the _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ The signal is transmitted through a transmission line, and the L connection point is divided into two transmission lines respectively to transmit the crosstalk and overshoot problems in the (4) type τ type extension wire structure to the AGP slot and the s terminal, thereby improving the signal transmission. Collection [Embodiment] Taiyue Day = read the second picture 'Α The invention was invented A simple schematic of the wiring architecture. :Product ===_ constituting 'in the printed circuit board' Northbridge wafers are transferred in two or two transmission lines 120, and in a connection, point ί ί Γ / 160 respectively to the AGP slot 2 〇〇 and S Terminal 300 is delivered. In the example of transmission, the length of the transmission line (10) is 5 GGmils': Line 2: (10) is 3 〇〇〇 mils in length. If in the printed circuit /, clothing. Also, one of the AGP slots or s terminals, such as when only the AGp 1304533 slot is installed and the s terminal is vacant, 'from the north bridge wafer', the unit signal is transmitted along the transmission line 120, and after the connection point A, respectively, along the transmission wheel The line 14A and the transmission line 160 pass 'the total reflection is also transmitted to the elevation slot_ due to the empty connection of the s terminal. Since the lengths of the transmission lines 140 and 160 are symmetrically equal, the signal level on the AGp slot is - units. The fourth picture shows the simulation 'shape of the type architecture. The waveform curve 3 in the figure is the ideal waveform on the AGP slot, and the waveform curve 5 is the simulation waveform of the example. Compared with the existing wiring structure, the ringing and overshooting The phenomenon has been greatly improved and the signal quality is good. In theory, the best way to route is two transmission lines 14 〇, 16 〇 = length should be equal, but considering the actual wiring requirements, the pure remaining part of the design rest = so = the difference between the transmission lines is as small as possible, the two The length difference of the transmission line: Μ MT formula calculation · (4) Transmission speed / rise time. In this embodiment, the maximum wiring gap. In the third figure, the waveform 4 is a simulation waveform when the length of the animal transmission line 160 is designed to be 25 mils. In the second embodiment of the present invention, the transfer of the north bridge wafer 1 is still divided into two at the connection point A. The length of the transmission line is 5 〇〇 。. The transmission line 12 The simulation waveform of the second embodiment of G, and the waveform curve 5, that is, 160 fluttering = see that in the topological frame of the transmission line, the closer the connection point A is to the AGP slot (10), the quality of the signal is still acceptable. Other single-drive units and more people skilled in the art are only preferred embodiments of the present invention, and those skilled in the art are familiar with the equivalent repair or change 1304533 in the spirit of the present invention.
化，皆應涵蓋於以下之申請專利範圍内。 【圖式簡單說明】 第一圖係現有的北橋晶片與AGP插槽和S端子的佈線架 構不意圖。 第二圖係S端子空接時的仿真波形圖。 第三圖係本發明T型佈線架構的簡單示意圖。 第四圖係第一實施例的仿真波形圖。 第五圖係第二實施例的仿真波形圖。 【主要元件符號說明】 北橋晶片 100 傳輸線 120, 140,160 AGP插槽 200 S端子 300All should be covered by the following patent application. [Simple description of the drawing] The first figure is not intended for the existing Northbridge chip and the wiring structure of the AGP slot and S terminal. The second figure is a simulation waveform diagram when the S terminal is vacant. The third figure is a simplified schematic diagram of the T-type wiring architecture of the present invention. The fourth figure is a simulation waveform diagram of the first embodiment. The fifth figure is a simulation waveform diagram of the second embodiment. [Main component symbol description] North Bridge chip 100 transmission line 120, 140, 160 AGP slot 200 S terminal 300