AMD SC1200, SC1201 manual DC Characteristics for On State

32579B Electrical Specifications

9.1.5.3Definition 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 9-5shows how these factors are controlled when measuring the typical average and absolute maximum processor current parameters.

9.1.5.4DC Current Measurements

Table 9-6and Table 9-7show the DC current measure- 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

		System Conditions
	VCORE	VIO	DCLK	SDRAM
CPU Current Measurement	(Note 1)	(Note 1)	Frequency	Frequency
Typical Average	Nominal	Nominal	50 MHz (Note 2)	Nominal
Absolute Maximum	Max	Max	135 MHz (Note 3)	Max

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.

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	240	260	mA	ICC for VIO
	(Nominal); CPU state = On, excludes TFT
	interface contribution and DACs
ICOREON	fCLK = 266 MHz, Core Current @ VCORE =	900	1090	mA	ICC for VCORE
	1.8V (Nominal); CPU state = On
ISBON	SB Current @ VSB = 3.3V (Nominal); CPU	1	2	mA
	state = On
ISBLON	SBL Current @ VSBL = 1.8V (Nominal); CPU	10	20	mA
	state = On
ICC3ONTFT	I/O current contribution if TFT display is used	30	50	mA
ICCTV	If TV interface is used: CCTV Current @	120	150	mA
	VCCTV = 3.3 (Nominal); CPU state = On
ICCCRT	If CRT interface is used: CCCRT Current @	60	80	mA
	VCCCRT = 3.3 (Nominal); CPU state = On

Note 1. fCLK ratings refer to internal clock frequency.

368 AMD Geode™ SC1200/SC1201 Processor Data Book