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32579B
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.
Table 9-5. System Conditions Used to Measure SC1200/SC1201 Current During On State
CPU Current Measurement
Typical Average
Absolute Maximum
Note 1. See Table 9-3 on page 366 for nominal and maximum voltages.
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.
Symbol
Parameter (Note 1)
I
f
= 266 MHz, I/O Current @ V
CC3ON
CLK
(Nominal); CPU state = On, excludes TFT
interface contribution and DACs
I
f
= 266 MHz, Core Current @ V
COREON
CLK
1.8V (Nominal); CPU state = On
I
SB Current @ V
SBON
state = On
I
SBL Current @ V
SBLON
state = On
I
I/O current contribution if TFT display is used
CC3ONTFT
I
If TV interface is used: CCTV Current @
CCTV
V
= 3.3 (Nominal); CPU state = On
CCTV
I
If CRT interface is used: CCCRT Current @
CCCRT
V
= 3.3 (Nominal); CPU state = On
CCCRT
Note 1. f
ratings refer to internal clock frequency.
CLK
368
V
CORE
(Note 1)
Nominal
Max
Table 9-6. DC Characteristics for On State
= 3.3V
IO
=
CORE
= 3.3V (Nominal); CPU
SB
= 1.8V (Nominal); CPU
SBL
9.1.5.4
DC Current Measurements
Table 9-6 and Table 9-7 show the DC current measure-
ments
of
the
SC1200/SC1201
SC1200/SC1201 processor supports TV, CRT, and TFT
displays, but it is expected that generally only one display
interface
will
be
used.
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.
System Conditions
V
DCLK
IO
(Note 1)
Frequency
Nominal
50 MHz (Note 2)
Max
135 MHz (Note 3)
Typ Avg
Abs Max
240
260
900
1090
1
2
10
20
30
50
120
150
60
80
AMD Geode™ SC1200/SC1201 Processor Data Book
Electrical Specifications
processor.
The
Power
consumed
by
the
SDRAM
Frequency
Nominal
Max
Unit
Comments
mA
I
for V
CC
IO
mA
I
for V
CC
CORE
mA
mA
mA
mA
mA
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