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標(biāo)準(zhǔn)網(wǎng)格 網(wǎng)格式布線器 gridbased router 10 ? techfile PHYSICAL RULES ? 最小交疊 minOverlap: 交疊有兩種形式: a. 一幾何圖形內(nèi)邊界到另一圖形的內(nèi)邊界長度( overlap) b. 一幾何圖形外邊界到另一圖形的內(nèi)邊界長度( extension) 標(biāo)準(zhǔn)網(wǎng)格 網(wǎng)格式布線器 gridbased router 11 ? techfile PHYSICAL RULES 標(biāo)準(zhǔn)網(wǎng)格 網(wǎng)格式布線器 gridbased router please keep these rules in your mind and don’t violate them when you layout. 12 ? techfile PHYSICAL RULES 標(biāo)準(zhǔn)網(wǎng)格 網(wǎng)格式布線器 gridbased router The width of “N WELL” must be greater than or equal to the “minWidth= microns”。 and the space of two “N WELLs” must be greater than or equal to the minSpacing= microns”. N WELL N WELL ≧ minSpacing ≧ minWidth 13 ? coarse grid example: 標(biāo)準(zhǔn)網(wǎng)格 網(wǎng)格式布線器 gridbased router Minimum wire is 1 micron, minimum spacing is 1 micron, therefore, our two wires use 3 microns, and we have established centertocenter grid spacing of 2 microns for this process. 2 microns 1 microns 1 microns 1 microns 最小金屬線越寬,或金屬線間必須相隔得越遠(yuǎn),網(wǎng)格也就越大 14 標(biāo)準(zhǔn)網(wǎng)格 網(wǎng)格式布線器 gridbased router ? determining our minimum wire widths and minimum spacing between wires dictate how coarse or fine our grid will be. ? 最小金屬線越寬,或金屬線間必須相隔得越遠(yuǎn),網(wǎng)格也就越大 。 ? “design rules determine grid size.” ? the gridbased router can only place wires along our grid lines, from intersection to intersection. 15 標(biāo)準(zhǔn)網(wǎng)格 規(guī)則式布線器 rulebased router ? 不同工藝層上的金屬線寬及其間距都有不同的最小寬度,如果我們要使所有的網(wǎng)格都采用同樣的尺寸,那么我們只能統(tǒng)一地采用芯片上尺寸要求最大的那個(gè)工藝層上的尺寸。 ? “ rulebased router: uses the real design rules for each layer, instead of using a fixed grid.” ? 大多數(shù)人采用 gridbased router,因?yàn)樗唵危? 如果采用 rulebased router,緊湊,節(jié)省版圖空間。 16 標(biāo)準(zhǔn)網(wǎng)格 規(guī)則式布線器 rulebased router 對每一層采用不同的網(wǎng)格尺寸,但這會使我們很難把所有的接觸孔和通孔都對齊并