CS5535-UDCF AMD (ADVANCED MICRO DEVICES), CS5535-UDCF Datasheet - Page 80

• Manufacturer Part Number: CS5535-UDCF
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of CS5535-UDCF

• Operating Temperature (min): 0C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

4.9.1
In order to support power management in periods of inac-
tivity as well as “off” conditions, the Geode CS5535 com-
panion device is divided into three power domains:
• Working Domain - Consists of V
• Standby Domain - Consists of V
• RTC Domain - Consists of V
When the system is in an operational mode, all three of the
domains are on. In general the power management tech-
niques used while operating produce power savings with-
out user awareness. The performance and usability of the
system is unaffected.
When the system is “off” only the standby domain is pow-
ered. If desired, the operational design can allow returning
the system to the operational point when the system was
last “on”. This “instant on” feature is a requirement for
many battery powered systems.
If the system has been removed from all power sources the
Real Time Clock (RTC) can be kept operating with a small
button battery.
All sections of the Geode CS5535 companion device use
the Working domain except:
Standby Domain
• GPIO[31:24] and associated registers.
• GPIO Input Conditioning Functions 6 and 7.
• GPIO Power Management Events (PMEs) 6 and 7.
• MFGPT[7:6].
• Power Management Controller (PMC) Standby
• PMC Standby registers starting at PMS I/O Offset 30h.
RTC Domain
• Real Time Clock
4.9.2
ACPI power management is a standardized method to
manage power. An overview of the standard is presented
here. See Section 5.17 "Power Management Control" on
page 172 for a more complete discussion of ACPI support
in the Geode CS5535 companion device See ACPI specifi-
cation v2.0 for complete details on ACPI. A Geode GX pro-
cessor/CS5535 companion device 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:
80
Controller and associated I/O consisting of: WORKING,
WORK_AUX, and RESET_OUT.
See Table 6-68 "PM Support Registers Summary" on
page 495.
Power Domains
ACPI Power Management
31506B
BAT
CORE
CORE_VSB
and V
and V
IO
IO_VSB
C0-C3 and CT, and three Device states: D0-D2. In a
Geode GX processor/CS5535 companion device system
design, the optional Sleep state S2, and the CPU states C3
and CT (CPU Throttling) are not supported. See Table 5-
34 "Supported ACPI Power Management States" on page
172“. Table 5-34 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.
4.9.3
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
• Application support is inconsistent. Some applications in
• APM does not help with Suspend determination or
4.10
The revision ID number of the Geode CS5535 companion
device may be read in any of the following places. All
return the same value:
1)
2)
3)
The revision is an 8-bit value. Bits [7:4] indicate major revi-
sions while bits [3:0] indicate minor revisions. For example:
0x11
0x12
0x21
For listing of updates, refer to the AMD Geode™ CS5535
Companion Device Specification Update document.
for some operating systems.
foreground may prevent Idle calls.
peripheral power management.
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].
AMD Geode™ CS5535 Companion Device Data Book
A1
A2
B1
APM Power Management
Component Revision ID
Value assigned to first manufactured
silicon of any new product.
Minor update to first silicon.
Major change to first silicon.
Global Concepts and Features