
388
AMD Geode SC1200/SC1201 Processor Data Book
Electrical Specifications
Revision 7.1
9.1.5.3
Definition of System Conditions for
Measuring On Parameters
The SC1200/SC1201 processor’s current is highly depen-
dent on two functional characteristics, DCLK (DOT clock)
and SDRAM frequency.
Table 9-5 shows how these factors
are controlled when measuring the typical average and
absolute maximum processor current parameters.
9.1.5.4
DC Current Measurements
ments
of
the
SC1200/SC1201
processor.
The
SC1200/SC1201 processor supports TV, CRT, and TFT
displays, but it is expected that generally only one display
interface
will
be
used.
Power
consumed
by
the
SC1200/SC1201 processor is different with different dis-
plays. The CRT and TV DACs require current, while the
TFT interface even though it has no DAC to power, also
draws current while it is active. The CRT and TV DACs and
the TFT interface are presented as separate line items.
The chosen display type I/O current should be added to the
Typical, Absolute Maximum, and Active Idle I/O currents to
get total current.
Table 9-5. System Conditions Used to Measure SC1200/SC1201 Current During On State
CPU Current Measurement
System Conditions
VCORE
(Note 1)
VIO
DCLK
Frequency
SDRAM
Frequency
Typical Average
Nominal
50 MHz (Note 2)
Nominal
Absolute Maximum
Max
135 MHz (Note 3)
Max
Note 2. A DCLK frequency of 50 MHz is derived by setting the display mode to 800x600x8 bpp at 75 Hz, using a display
image of vertical stripes (4-pixel wide) alternating between black and white with power management disabled.
Note 3. A DCLK frequency of 135 MHz is derived by setting the display mode to 1280x1024x8 bpp at 75 Hz, using a display
image of vertical stripes (1-pixel wide) alternating between black and white with power management disabled.
Table 9-6. DC Characteristics for On State
Symbol
Parameter (Note 1)
Typ Avg
Abs Max
Unit
Comments
ICC3ON
fCLK = 266 MHz, I/O Current @ VIO = 3.3V
(Nominal); CPU state = On, excludes TFT
interface contribution and DACs
240
260
mA
ICC for VIO
ICOREON
fCLK = 266 MHz, Core Current @ VCORE =
1.8V (Nominal); CPU state = On
900
1090
mA
ICC for VCORE
ISBON
SB Current @ VSB = 3.3V (Nominal); CPU
state = On
12
mA
ISBLON
SBL Current @ VSBL = 1.8V (Nominal); CPU
state = On
10
20
mA
ICC3ONTFT
I/O current contribution if TFT display is used
30
50
mA
ICCTV
If TV interface is used: CCTV Current @
VCCTV = 3.3 (Nominal); CPU state = On
120
150
mA
ICCCRT
If CRT interface is used: CCCRT Current @
VCCCRT = 3.3 (Nominal); CPU state = On
60
80
mA
Note 1. fCLK ratings refer to internal clock frequency.