ALXD800EEXJ2VD AMD (ADVANCED MICRO DEVICES), ALXD800EEXJ2VD Datasheet - Page 597

• Manufacturer Part Number: ALXD800EEXJ2VD
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of ALXD800EEXJ2VD

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

Electrical Specifications
7.4
DC current is not a simple measurement. Three of the
Geode LX processor’s power states (ON, Active Idle, and
Sleep) were selected for measurement. For the ON power
state measured, two functional characteristics (Typical
Average and Absolute Maximum) are used to determine
how much current the Geode LX processor requires.
7.4.1
The DC current tables in this section list Core and I/O cur-
rent for three of the power states.
• On (S0/C0): All internal and external clocks with respect
• Active Idle (S0/C1): The CPU Core has been halted
• Sleep (S1): This is the lowest power state the Geode LX
All measurements were taken at 25C ambient air.
7.4.2
The following two parameters describe the Geode LX pro-
cessor current while in the ON state:
Typical Average
Typical Average (Typ Avg) indicates the average current
used by the Geode LX processor while in the ON state,
with no active power management. This measurement is
comprised of two components: WinBench99’s “Business
Graphics Test” and Active Idle power measurements. Win-
Bench 99 represents a maximum typical state as it simu-
lates a knowledgeable worker’s typical day compressed
into the shortest period of time possible. Since it is not pos-
sible for someone to operate as fast as the benchmark, the
resulting power from the benchmark is averaged with
Active Idle in an 80/20 ratio, with 80% of the time being in
the XP Idle state and 20% of the time running applications.
This results in a Typical Average power result.
For each voltage, power is measured at one second inter-
vals. The measurements are then averaged together to
produce the final number. The CRT resolution is
1024x768x32 bpp, at 85 Hz refresh and the TFT resolution
is 1024x768 x16 bpp at 60 Hz refresh. This number is pro-
vided for reference only since it can vary depending on the
usage model of the system.
AMD Geode™ LX Processors Data Book
to the Geode LX processor are running and all functional
blocks (CPU Core, Memory Controller, Display
Controller, etc.) are actively generating cycles. This is
equivalent to the ACPI specification’s “S0/C0” state.
and all other functional blocks (including the Display
Controller for refreshing the display) are actively gener-
ating cycles. This state is entered when a HLT instruc-
tion is executed by the CPU Core. From a user’s
perspective, this state is indistinguishable from the On
state and is equivalent to the ACPI specification’s
“S0/C1” state.
processor can be in with voltage still applied to the
device’s core and I/O supply pins. This is equivalent to
the ACPI specification’s “S1” state.
DC Current
Power State Parameter Definitions
Definition and Measurement Techniques
of Current Parameters
Thermal Design Power
Absolute Maximum and Thermal Design Power (TDP) indi-
cates the maximum average current used by the Geode LX
processor. This is measured with the voltages at maximum.
BurnMMX causes the LX processor to consume the maxi-
mum amount of power for the Core and I/O rails, while
WinBench99’s “Business Graphics Test” causes the LX
processor to consume maximum power on the Memory
rail. All tests were run at the maximum supported resolu-
tion of 1920x1440x32 bpp at 72 Hz refresh for the CRT and
1600x1200x16 bpp at 60 Hz refresh for TFT.
This test does not guarantee maximum current. There may
be pathalogical applications that result in higher measured
currents.
TDP is a function of all power contributors at maximum.
Applications that do not use the CRT or TFT output will
have a somewhat lower TDP. Operating the memory sub-
system at a lower frequency will also lower TDP. Specific
software applications may place lower compute demands
on the CPU, which lowers the TDP as well.
If needed, it is up to the system designer to determine TDP
for systems that operate with conditions that are different
then those specified, however, the TDP specified is the
maximum.
Active Idle
Active Idle power is measured at the XP Idle state when
the monitor is still turned on. During this state the “Bliss”
background is used. The CRT resolution is 1024x768x32
bpp, at 85 Hz refresh and 1024x768 x16 bpp at 60 Hz
refresh is used for TFT. This number is provided for refer-
ence only since it can vary depending on the background
image and processes running on the system.
Sleep
The Sleep power state is achieved by forcing the system
into a “S1” state as defined by the ACPI specification.
7.4.3
Table 7-3 on page 598 shows the DC current measure-
ments of the Geode LX processor. The Geode LX proces-
sor supports CRT or TFT displays.
The CRT DACs require current; while the TFT interface,
even though it has no DAC to power, also draws current
while it is active. Therefore, the CRT DACs and the TFT
interface currents are specified in separate tables.
The data bus on the DDR SDRAM has a low voltage swing
when actively terminated (terminated topology). The termi-
nated topology supports higher data transfer rates and is
less constrained, but it consumes more power. Many
designs should be able to operate reliably without active
termination (unterminated topology). The design con-
straints are smaller memory subsystems and tight control
on routing. See the application note, AMD Geode™ LX
DC Current Measurements
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