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SC3200 Datasheet(PDF) 81 Page - Advanced Micro Devices |
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SC3200 Datasheet(HTML) 81 Page - Advanced Micro Devices |
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81 / 447 page  AMD Geode™ SC3200 Processor Data Book 81 Signal Definitions Revision 5.1 PWRBTN# E29 AH5 I Power Button. Input used by the power management logic to monitor external sys- tem events, most typically a system on/off button or switch. The signal has an internal pull-up of 100 K Ω, a Schmitt-trigger input buffer and debounce protection of at least 16 ms. ACPI is non-functional and all ACPI outputs are undefined when the power-up sequence does not include using the power button. SUSP# is an internal signal generated from the ACPI block. Without an ACPI reset, SUSP# can be permanently asserted. If the USE_SUSP bit in CCR2 of GX1 module is enabled (Index C2h[7] = 1), the CPU will stop. If ACPI functionality is desired, or the situa- tion described above avoided, the power but- ton must be toggled. This can be done externally or internally. GPIO63 is internally connected to PWRBTN#. To toggle the power button with software, GPIO63 must be programmed as an output using the normal GPIO programming protocol (see Section 6.4.1.1 "GPIO Support Registers" on page 240). GPIO63 must be pulsed low for at least 16 ms and not more than 4 sec. Asserting POR# has no effect on ACPI. If POR# is asserted and ACPI was active prior to POR#, then ACPI will remain active after POR#. Therefore, BIOS must ensure that ACPI is inactive before GPIO63 is pulsed low. --- PWRCNT1 F31 AK6 O Suspend Power Plane Control 1 and 2. Control signal asserted during power man- agement Suspend states. These signals are open-drain outputs. --- PWRCNT2 G31 AL7 O --- THRM# F28 AK4 I Thermal Event. Active low signal generated by external hardware indicating that the sys- tem temperature is too high. --- 3.4.15 Power Management Interface Signals (Continued) Signal Name Ball No. Type Description Mux EBGA TEPBGA |
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