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ICS950813 Datasheet(PDF) 5 Page - Integrated Circuit Systems |
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ICS950813 Datasheet(HTML) 5 Page - Integrated Circuit Systems |
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5 / 22 page  5 ICS950813 Advance Information 0708—10/10/02 Host Swing Select Functions MULTSEL 0 1 Output Ioh = 4 * I REF Ioh = 6 * I REF 1.0V @ 50 ohm 0.7V @ 50 ohm Voh @ Z Board Target Reference R, Rr = 221 1%, Iref = 5.00mA Rr = 475 1%, Iref = 2.32mA 50 ohms 50 ohms PCI Select Functions 1 0 1.0ns 1 1 1.5ns 0 0 0ns 0 1 0.5ns E_PCICLK1 E_PCICLK3 E_PCICLK(3,1) * Note: * Approximate values E_PCICLK3 = 10Kohm resistor. 0 = No resistor 1 = 10Kohm pull-up to V DD. E_PCICLK1 = 10Kohm resistor. Frequency Select Table 2 FS4 FS3 FS2 000 001 010 011 100 101 110 111 Freqency Select CPU, 3V66, PCI Standard Clocking 10% Overclocking Clocking Mode Standard Clocking 0.3% Center Spread Standard Clocking 0 to -0.5%, Down Spread 0.3% Center Spread Standard Clocking 0 to - 0.75%, Down Pwr Save Clocking Spread Off 0.3% Center Spread 3% Overclocking 0.3% Center Spread 5% Overclocking 0.3% Center Spread PWRSAVE# Usage Illustration Bit4 Bit3 Bit2 Bit1 Bit0 CPU AGP PCI FS4 FS3 FS2 FS1 FS0 MHz MHz MHz X X X 0 0 XXX XXX XXX X X X 0 1 XXX XXX XXX X X X 1 0 XXX XXX XXX XX X 1 1 XXX XXX XXX 1 0 0 0 0 80.00 53.33 26.67 1 0 0 0 1 106.66 53.33 26.67 1 0 0 1 0 160.00 53.33 26.67 10 0 1 1 133.33 53.33 26.67 PWRSAVE# = '0'. as PWRSAVE# is driven to low '0'. The output frequencies of the CPU, AGP and PCI clock will smoothly switch to frequencies indicated by FS (4:2) = 100. The frequencies gear ratio will be kept the same. Notice that the 48MHz & REF frequencies will not be changed. This function can be used with asynchronous AGP/PCI frequencies. PWRSAVE# = '1'. as PWRSAVE# is driven back to high '1'. The output frequencies will be driven back to the original programmed frequencies smoothly. Notice that this operation will only happen after the PWRSAVE# has been driven to '0'. This will not affect power up or I2C programmed frequencies if the PWRSAFE# has been tied to a '1'. |
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