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XIO2000AI 数据表(PDF) 28 Page - Texas Instruments |
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XIO2000AI 数据表(HTML) 28 Page - Texas Instruments |
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28 / 165 page  Introduction 19 April 2007 Revised October 2008 SCPS155C Table 2−9. Clock Terminals SIGNAL GZZ/ZZZ BALL # ZHC BALL # ZHH BALL # I/O TYPE CELL TYPE CLAMP RAIL EXTERNAL PARTS DESCRIPTION REFCLK_SEL A16 D11 A14 I LV CMOS VDD_33 Pullup or pulldown resistor Reference clock select. This terminal selects the reference clock input. 0 = 100-MHz differential common reference clock used. 1 = 125-MHz single-ended, reference clock used. REFCLK+ C17 C14 C13 DI HS DIFF IN VDD_33 − Reference clock. REFCLK+ and REFCLK− comprise the differential input pair for the 100-MHz system reference clock. For a single-ended, 125-MHz system reference clock, use the REFCLK+ input. REFCLK− C16 B14 C14 DI HS DIFF IN VDD_33 Capacitor to VSS for single-ended mode Reference clock. REFCLK+ and REFCLK− comprise the differential input pair for the 100-MHz system reference clock. For a single-ended, 125-MHz system reference clock, attach a capacitor from REFCLK− to VSS. CLK P03 L03 L03 I PCI Bus VCCP − PCI clock input. This is the clock input to the PCI bus core. CLKOUT0 CLKOUT1 CLKOUT2 CLKOUT3 CLKOUT4 CLKOUT5 CLKOUT6 C08 B09 B10 A11 A12 A13 B14 D07 A08 A09 D09 A11 C10 C11 D07 B08 A09 D10 B10 B11 A13 O PCI Bus VCCP − PCI clock outputs. These clock outputs are used to clock the PCI bus. If the bridge PCI bus clock outputs are used, then CLKOUT6 must be connected to the CLK input. |
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