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XM014532A Datasheet(PDF) 31 Page - Xmos Ltd. |
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XM014532A Datasheet(HTML) 31 Page - Xmos Ltd. |
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31 / 99 page ![]() XU6--TQ8 Datasheet 0.0 valid VDD VDDIOB18 VDDIO* valid valid 0.9 0.0 1.8 0.0 V(VDDIO*) VDDIOB18 and VDD valid VDDIO* must be valid before VDDIO* valid 0.0 V(VDDIO*) RST_N high VDDIO* valid before 0.0 External RST_N 1.8 Time (a) Power sequencing, rely on internal POR Time (b) Power sequencing, use external RST_N Internal PORST_N 0 1 Th(VDDIOB18) Th(VDD) T(POR) VDDIOB18 and VDD must be valid within T(POR) of crossing threshold Figure 8: Sequencing of power supplies and RST_N (if used) D+ D- D+ D- Low speed signal High speed signal Signal Signal GND Power Differential pair Differential pair W S 1 S 2 S 2 S 3 H Figure : Spacings of a low speed signal, two differential pairs and a high speed signal Parameter USB MIPI Value Unit Value Unit Impedance Ω x˜ Ω W : trace width . mm . mm S1 : spacing between D+/D- . mm . mm S2 : spacing between diff pairs . mm .6 mm S3 : spacing to high speed signal . mm . mm H : di-electric height . mm . mm Skew between D+/D- mm . mm Skew between clock/data N/A mm Figure : Differential pair parameters . General routing and placement guidelines The following guidelines will help to avoid signal quality and EMI problems on high speed designs. They relate to a four-layer (Signal, GND, Power, Signal) PCB. |
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