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ICS1531 Datasheet(PDF) 57 Page - Integrated Circuit Systems |
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ICS1531 Datasheet(HTML) 57 Page - Integrated Circuit Systems |
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57 / 76 page ![]() Chapter 7 Programming ICS1531 Rev N 12/1/99 December, 1999 57 Copyright © 1999, Integrated Circuit Systems, Inc. All rights reserved. ICS1531 Data Sheet - Preliminary 7.3.2 Programming Flow for Modifying Settings for Spread Spectrum Figure 7-4. ICS1531 Flow for PNLCLK and MCLK PLL Spread-Spectrum Settings Set M, N, PFD Gain, and Output Scaler Change PLL Freq. ? No Yes Disable Spread Spectrum Mode PNLCLK Reg 25:1 = 0 MCLK Reg 2B:1 = 0 PNLCLK Regs 20, 21, 24 MCLK Regs 26, 27, 2A Wait ~ 1ms Done PNLCLK and MCLK Reg 2D Yes No PLL Software Reset Change Spread Spectrum Mode? Yes No Enable Spread Spectrum Mode PNLCLK Regs 22, 23, 24 MCLK Regs 28, 29, 2A PNLCLK Reg 25:1 = 1 MCLK Reg 2B:1 = 1 Set Spread Sepctrum Counter and Gain |
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