82845G Datasheet, PDF (148/193 Pages) Intel Corporation – Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH)

Electrical Characteristics
6.3
Power Characteristics
Table 6-3. Power Characteristics
Symbol
P_GMCH(DDR)
P_GMCH(SDR)
I_VCC(DDR)
I_VCC(SDR)
I_VCCAGP
I_VCCAGP
I_VCCHI
I_VTTFSB
I_VCCSM(DDR)
I_{SUS_2.5}
I_VCCSM(SDR)
I_{SUS_3.3}
Parameter
Thermal Design Power
Thermal Design Power
1.5 V Core Supply Current
1.5 V Core Supply Current
1.5 V AGP Supply Current (AGP mode)
1.5 V AGP Supply Current (DVO mode)
1.5 V Hub Interface Supply Current
GMCH VTT supply Current
DDR System Memory Interface (2.5 V) Supply Current
2.5 V Standby Supply Current
SDR System Memory Interface (3.3 V) Supply Current
3.3 V Standby Supply Current
Max
2.46
2.0
0.37
0.18
90
2.4
2.2
95
1.6
5
Unit
Notes
W1
W1
A
2
A
2
A
2
A
2
mA 2
A
A
mA
A
mA
NOTES:
1. See Intel^® 845G/845GL/845GV Chipset: Intel^® 82845G/82845GL/82845GV Graphics and Memory Controller
Hub (GMCH) Thermal and Mechanical Design Guidelines for more information.
2. These current levels may happen simultaneously and can be summed into one supply.
6.4
Signal Groups
The signal description includes the type of buffer used for the particular signal (see Table 6-4):
AGTL+
AGP
HI CMOS
DDR CMOS
SDR CMOS
Open Drain AGTL+ interface signal. Refer to the AGTL+ I/O Specification
for complete details. The GMCH integrates most AGTL+ termination
resistors.
AGP interface signals. These signals are compatible with AGP 2.0 1.5 V
Signaling Environment DC and AC Specifications. The buffers are not 3.3 V
tolerant. (DVO signals use the same buffers as AGP)
Hub Interface 1.5 V CMOS buffers.
DDR System memory 2.5 V CMOS buffers.
SDR System memory 3.3 V CMOS buffers.
Table 6-4. Signal Groups (Sheet 1 of 2)
Signal
Group
Signal Type
Signals
AGP Interface Signal Groups
(a)
AGP I/O
(b)
AGP Input
(c)
AGP Output
(d)
AGP Miscellaneous
GADSTB_[1:0], GADSTB_[1:0]#, GFRAME#, GIRDY#, GTRDY#,
GSTOP#, GDEVSEL#, GAD_[31:0], GC/BE_[3:0]#, GPAR
GPIPE#, GSBA_[7:0], GRBF#, GWBF#, GSBSTB, GSBSTB#, GREQ#
GST_[2:0], GGNT#
AGP_VREF, AGP_RCOMP
148
Intel^® 82845G/82845GL/82845GV GMCH Datasheet