82845G Datasheet, PDF (150/193 Pages) Intel Corporation – Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH)

Electrical Characteristics
6.5
DC Parameters
Table 6-5. DC Operating Characteristics
Signal Name
Parameter
I/O Buffer Supply Voltage
VCC
VCCAGP
VCCHI
VCCA_DAC
Core Voltage
AGP I/O Voltage
Hub Interface I/O Voltage
DAC Supply Voltage
VTT
VCCSM(DDR)
VCCSM(SDR)
Host AGTL+ Termination
Voltage
DDR I/O Supply Voltage
SDR I/O Supply Voltage
Reference Voltages
AGP_VREF
HI_VREF
HI_SWING
HA_VREF/
HD_VREF
HX_SWING/
HY_SWING
HCC_VREF
SM_VREF
(DDR)
SM_VREF
(SDR)
AGP Reference Voltage
Hub Interface Reference
Voltage
Hub Interface Compensation
Reference Voltage
Host Address and Data
Reference Voltage
Host Compensation
Reference Voltage
Host Common Clock
Reference Voltage
DDR Reference Voltage
SDR Reference Voltage
Min
Nom
Max
Unit
1.425
1.5
1.575
V
1.425
1.5
1.575
V
1.425
1.5
1.575
V
1.425
1.5
1.575
V
1.15
N/A
1.75
V
2.375
2.5
2.625
V
3.135
3.3
3.465
V
1/2 VCCAGP
– 2%
1/2 x
VCCAGP
1/2 VCCAGP
+ 2%
V
0.343
0.35
0.357
V
0.686
0.7
0.714
V
2/3 x VTT – 2% 2/3 x VTT 2/3 x VTT + 2% V
1/3 x VTT – 2% 1/3 x VTT 1/3 x VTT + 2% V
2/3 x VTT – 2% 2/3 x VTT 2/3 x VTT + 2% V
0.5 VCCSM
(DDR) – 2%
1/2 x VCCSM
(DDR)
0.5 VCCSM
(DDR) + 2%
V
0.5 VCCSM
(SDR) – 2%
1/2 x VCCSM
(SDR)
0.5 VCCSM
(SDR) + 2%
V
NOTES:
1. HA_VREF/HD_VREF and HCC_VREF are generically referred to as GTLREF throughout the rest of this
document.
2. HI_VREF and HI_SWING are set according to the nominal VCC.
3. The DC specifications are intended solely for DC measurements and do not comprehend any AC noise
components.
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Intel^® 82845G/82845GL/82845GV GMCH Datasheet