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C5C5EDELTA-RM/D 数据表(PDF) 76 Page - NXP Semiconductors |
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C5C5EDELTA-RM/D 数据表(HTML) 76 Page - NXP Semiconductors |
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76 / 114 page  76 CHAPTER 3: ELECTRICAL SPECIFICATIONS C Power Sequencing It is intended that the VDD33/VDDT/VDDF and VDD rails are sequenced to their final value together for most applications. VDD33, VDDT and VDDF must be above VDD at all times. VDD must be brought to its final value within 100ms of sequencing on VDD33, VDDT and VDDF. It is also required that SCLK, SCLKX, TCLKI, PCLK, MDCLK, FTXCLK, and FRXCLK be running or begin running during power sequencing to propagate reset inside the C-5e NP. Figure 9 indicates the relationship between the clocks and PRSTX. There is no requirement that the asserting and deasserting edges of PRSTX be synchronous to the clocks. Reset must be asserted within 100 µs of power initiation. Typically, reset is held low during power initiation. Figure 9 Bringup Clock Timing Diagram TCLKI, PCLK, SCLK, SCLKX, MDCLK, FTXCLK, FRXCLK PRSTX ³1ms ³100 µs ( ( ) ) ≤100 µs VDD, VDD33, VDDT, VDDF Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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