CS5535-UDCF AMD (ADVANCED MICRO DEVICES), CS5535-UDCF Datasheet - Page 172

• 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

5.17
The Power Management Control (PMC) module is a
GeodeLink™ Device whose function is to control all
aspects of power management. Power management is
event driven meaning that, in general, any action that the
PMC performs is predicated on some event. These events
can come from other GeodeLink Devices, including the
CPU module inside the Geode GX processor for example,
or events coming from other off-chip sources.
The PMC is compatible with the industry standard power
management capabilities as defined in the Advanced Con-
figuration and Power Interface (ACPI) v2.0 specification.
An OS that conforms to ACPI can take advantage of the
Geode CS5535 companion device ACPI support hardware.
Advanced Power Management (APM) is another power
management approach that the PMC supports. APM is a
subset of ACPI and therefore will not be directly discussed.
Components in a GeodeLink architecture based system
have hardware and software means of performing power
management which the PMC controls. A high performance
computing system consumes multiple watts of power when
fully on. However, with GeodeLink architecture, system
power consumption is significantly lower on average
through the use of power states that reduce power needs
when the system is idle.
5.17.1
The PMC module consists of three blocks: Working,
Standby and RTC.
• The Working block contains all circuits and functions
172
G0: Working
G1: Idle
G2: Soft Off
G3: Mechanical Off
associated with the Working power domain. It includes
Global System
State
Power Management Control
Power Domains
ACPI States
31506B
S3: Save-to-RAM
S4: Save-to-Disk
S1: Sleeping
Sleep State
Table 5-34. Supported ACPI Power Management States
Off
S0
S5
C State
C0
C1
C2
Off
Off
Off
Off
Geode GX
Processor
Suspend
on Halt
AHCG
Sleep
State
FO
Off
Off
Off
Off
• The Standby block contains all circuits and functions
• The RTC block contains the timing circuits for keeping
5.17.2
Table 5-34 shows the supported ACPI power states and
how they relate to the Geode GX processor/CS5535 com-
panion device system. ACPI power states not described
are not supported.
the Working state machine, Local bus interface, ACPI
power management registers, and power management
supporting logic (i.e., counters, timer, CCU, etc.). The
main function of the Working block is to put the system
into Sleep, that is, turn off clocks to the system and
disable I/Os to reduce power consumption.
associated with the Standby power domain. It includes
the Standby state machine, ACPI registers, and power
management supporting logic (i.e., counters, reset,
CCU, etc.). The function of the Standby logic is to
control power to the Working power domain. The PMC
disables all interfaces between the Standby and
Working domains while the Working power is off. A
special feature of the Standby state machine is called
Skip which allows the system to power up immediately
when power is applied. See the signal description for the
PWR_BUT# in Table 3-9 "GPIOx Available Functions
Descriptions" starting on page 49 for additional details.
real time. These circuits are powered by V
It is not a device requirement that the RTC block be
powered during Mechanical Off. If a system design does
not require that real time be kept, then V
tied to ground.
Geode CS5535
Working Logic
AMD Geode™ CS5535 Companion Device Data Book
Companion
Power States
Device
AHCG
AHCG
Sleep
FO
Off
Off
Off
Off
Hardware States
Auto-refresh
Auto-refresh
Memory
System
AHCG
AHCG
Main
FO
Off
Off
Off
Power Management Control
Standby Logic
BAT
Companion
BAT
On (Sleep)
CS5535
Standby
Standby
Device
should be
Geode
(ball A3).
On
Off