AMD SC2200 manual DC Characteristics for On State

32580B Electrical Specifications

9.1.5.3Definition of System Conditions for Measuring On Parameters

The SC2200’s current is highly dependent on two func- tional characteristics, DCLK (DOT clock) and SDRAM fre- quency. Table 9-5 on page 372 shows 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 SC2200. The SC2200 supports CRT and TFT

displays, but it is expected that generally only one display interface will be used. Power consumed by the SC2200 is different with different displays. The CRT DAC requires cur- rent, while the TFT interface even though it has no DAC to power, also draws current while it is active. The CRT DAC 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 SC2200 Current During the On State

		System Conditions
	VCORE	VIO		SDRAM
CPU Current Measurement	(Note 1)	(Note 1)	DCLK 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 370 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 = 233 MHz, I/O Current @ VIO = 3.3V	230	250	mA	ICC for VIO
	(Nominal); CPU state = On, excludes TFT
	interface contribution and CRT DAC
	fCLK = 266 MHz, I/O Current @ VIO = 3.3V	240	260
	(Nominal); CPU state = On, excludes TFT
	interface contribution and CRT DAC
	fCLK = 300 MHz, I/O Current @ VIO = 3.3V	250	270
	(Nominal); CPU state = On, excludes TFT
	interface contribution and CRT DAC
ICOREON	fCLK = 233 MHz, Core Current @ VCORE =	820	990	mA	ICC for VCORE
	1.8V (Nominal); CPU state = On
	fCLK = 266 MHz, Core Current @ VCORE =	900	1090
	1.8V (Nominal); CPU state = On
	fCLK = 300 MHz, Core Current @ VCORE =	1100	1400
	2.1V (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
	SBL Current @ VSBL = 2.1V (Nominal); CPU	10	20
	state = On
372			AMD Geode™ SC2200 Processor Data Book