CS5535 datasheet(73/555 Pages) NSC

73 / 555 page

Revision 0.8

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:

GLCP_CHIP_REV_ID register: MSR 51700017h[7:0].

PCI Configuration Space Device Revision ID:

PCI Index 08h[15:0].

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

Value assigned to first manufactured

silicon of any new product.

0x12

Minor update to first silicon.

0x21

Major change to first silicon.

For listing of updates, refer to the document entitled Geode

CS5535 I/O Companion Device Errata.

CS5535 数据表(PDF) 73 Page - National Semiconductor (TI)

CS5535 数据表(HTML) 73 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载