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34 AMD Geode™ LX Processors Data Book
Signal Definitions
33234H
TDP AL17 A Analog N/A Thermal Diode Positive (TDP). TDP is the positive
terminal of the thermal diode on the die. The diode is
used to do thermal characterization of the device in
a system. This signal works in conjunction with TDN.
For accurate die temperature measurements, a dual
current source remote sensor, such as the National
Semiconductor LM82, should be used. Single cur-
rent source sensors may not yield the desired level
of accuracy.
If reading the CPU temperature is required while the
system is off, then a small bias (<0.25V) on V
IO
is
required for the thermal diode to operate properly.
TDN AK17 A Analog N/A Thermal Diode Negative (TDN). TDN is the nega-
tive terminal of the thermal diode on the die. The
diode is used to do thermal characterization of the
device in a system. This signal works in conjunction
with TDP.
For accurate die temperature measurements, a dual
current source remote sensor, such as the National
Semiconductor LM82, should be used. Single cur-
rent source sensors may not yield the desired level
of accuracy.
If reading the CPU temperature is required while the
system is off, then a small bias (<0.25V) on V
IO
is
required for the thermal diode to operate properly.
3.4.1 System Interface Signals (Continued)
Signal Name
Ball
No. Type f V Description
3.4.2 PLL Interface Signals
Signal Name
Ball
No. Type f V Description
CAV
DD
W31 APWR Analog 3.3 Core PLL Analog Power. Connect to 3.3V.
CAV
SS
W30 APWR Analog 0 Core PLL Analog Ground. Connect to ground.
MAV
DD
V31 APWR Analog 3.3 GLIU PLL Analog Power. Connect to 3.3V.
MAV
SS
V30 APWR Analog 0 GLIU PLL Analog Ground. Connect to ground.
VAV
DD
AA1 APWR Analog 3.3 Video PLL Analog Power. Connect to 3.3V.
VAV
SS
AA2 APWR Analog 0 Video PLL Analog Ground. Connect to ground.
CLPF W29 A Analog N/A Core PLL Low Pass Filter. 220 pF to CAV
SS
.
MLPF V29 A Analog N/A GLIU PLL Low Pass Filter. 220 pF to MAV
SS.
VLPF AA3 A Analog N/A Video PLL Low Pass Filter. 220 pF to VAV
SS.