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ICS9148-02 Datasheet(PDF) 5 Page - Integrated Circuit Systems |
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ICS9148-02 Datasheet(HTML) 5 Page - Integrated Circuit Systems |
5 / 16 page 5 ICS9148-02 CPU 3.3_2.5# This Input pin controls the CPU and IOAPIC output buffer strength for skew matching CPU and SDRAM outputs to compensate for the external VDDL supply condition. It is important to use this function when selecting power supply requirements for VDDL1,2. A logic 0 (ground) will indicate 2.5V operation and a logic 1 will indicate 3.3V operation. This pin has an internal pullup resistor to VDD. PWR_DWN# This is an asynchronous active Low Input pin used to Power Down the device into a Low Power state by not removing the power supply. The internal Clocks are disabled and the VCO and Crystal are stopped. Powered Down will also place all the Outputs in a low state at the end of their current cycle. The latency of Power Down will not be greater than 3ms. The I2C inputs will be Tri-Stated and the device will retain all programming information. This input pin only valid when MODE=0 (Power Management Mode) CPU_STOP# This is a synchronous active Low Input pin used to stop the CPUCLK clocks in an active low state. All other Clocks including SDRAM clocks will continue to run while this function is enabled. The CPUCLKs will have a turn ON latency of at least 3 CPU clocks. This input pin only valid when MODE=0 (Power Management Mode) PCI_STOP# This is a synchronous active Low Input pin used to stop the PCICLK clocks in an active low state. It will not effect PCICLK_F nor any other outputs. This input pin only valid when MODE=0 (Power Management Mode) I2C The SDATA and SCLOCK Inputs are use to program the device. The clock generator is a slave-receiver device in the I2C protocol. It will allow read-back of the registers. See configuration map for register functions. The I2C specification in Philips I2C Peripherals Data Handbook (1996) should be followed. Technical Pin Function Descriptions |
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