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TMS570LS3137 bảng dữ liệu(PDF) 53 Page - Texas Instruments |
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TMS570LS3137 bảng dữ liệu(HTML) 53 Page - Texas Instruments |
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53 / 159 page  TMS570LS3137 www.ti.com SPNS162. – SEPTEMBER 2011 4.3 Power Sequencing and Power On Reset 4.3.1 Power-Up Sequence There is no timing dependency between the ramp of the VCCIO and the VCC supply voltage. The power-up sequence starts with the I/O voltage rising above the minimum I/O supply threshold, (see Table 4-4 for more details), core voltage rising above the minimum core supply threshold and the release of power-on reset. The high frequency oscillator will start up first and its amplitude will grow to an acceptable level. The oscillator start up time is dependent on the type of oscillator and is provided by the oscillator vendor. The different supplies to the device can be powered up in any order. The device goes through the following sequential phases during power up. Table 4-3. Power-Up Phases Oscillator start-up and validity check 1032 oscillator cycles eFuse autoload 1180 oscillator cycles Flash pump power-up 688 oscillator cycles Flash bank power-up 617 oscillator cycles Total 3517 oscillator cycles The CPU reset is released at the end of the above sequence and fetches the first instruction from address 0x00000000. Copyright © 2011, Texas Instruments Incorporated System Information and Electrical Specifications 53 Submit Documentation Feedback focus.ti.com: TMS570LS3137 |
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