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CS5535-UDC Datasheet(PDF) 73 Page - National Semiconductor (TI) |
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CS5535-UDC Datasheet(HTML) 73 Page - National Semiconductor (TI) |
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73 / 555 page  Revision 0.8 73 www.national.com Global Concepts and Features (Continued) • Power Management Controller (PMC) Standby Controller and associated I/O consisting of: WORKING, WORK_AUX, and RESET_OUT. • PMC Standby registers starting at PMS I/O Offset 30h. See Table 5-68 "PM Support Registers Summary" on page 478. RTC domain • Real Time Clock 3.9.2 ACPI Power Management ACPI power management is a standardized method to manage power. An overview of the standard is presented here. See Section 4.17 "Power Management Control" on page 159 for a more complete discussion of ACPI support in the CS5535. See ACPI specification v2.0 for complete details on ACPI. A GX2/CS5535 system solution can fully support all the requirements in the ACPI specification. ACPI defines power states from a system perspective down to a device perspective. There are four global system states: G0 through G3. As a subset of the Global system states G0-G2 there are six Sleep states: S0 through S5. Within the sleep states S0-S1 there are five CPU states: C0-C3 and CT, and three Device states: D0-D2. In a GX2/CS5535 system design, the optional Sleep state S2, and the CPU states C3 and CT (CPU Throttling) are not supported. See Table 4-34 "Supported ACPI Power Man- agement States" on page 159“. Table 4-34 shows how the ACPI power states relate to each other. The table also shows the condition of the power domains and the logic within those domains with respect to the ACPI power states. 3.9.3 APM Power Management Some systems rely solely on an APM (Advanced Power Management) driver for enabling the operating system to power-manage the CPU. APM provides several services which enhance the system power management. It is a rea- sonable approach to power management but APM has some limitations: • APM is an OS-specific driver, and may not be available for some operating systems. • Application support is inconsistent. Some applications in foreground may prevent Idle calls. • APM does not help with Suspend determination or peripheral power management. 3.10 COMPONENT REVISION ID The revision ID number of the CS5535 may be read in any of the following places. All return the same value: 1) GLCP_CHIP_REV_ID register: MSR 51700017h[7:0]. 2) PCI Configuration Space Device Revision ID: PCI Index 08h[15:0]. 3) TAP Controller Revision register: Instruction 8FFFFAh[7:0]. The revision is an 8-bit value. Bits [7:4] indicate major revi- sions while bits [3:0] indicate minor revisions. For example: 0x11 A1 Value assigned to first manufactured silicon of any new product. 0x12 A2 Minor update to first silicon. 0x21 B1 Major change to first silicon. For listing of updates, refer to the document entitled Geode CS5535 I/O Companion Device Errata. |
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