82830MP Datasheet, PDF (34/159 Pages) Intel Corporation – Intel 830MP Chipset: 82830MP Graphics and Memory Controller Hub (GMCH-M)

Intel® 830MP Chipset
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3.8
Voltage References, PLL Power
Table 15. Voltage References, PLL Power Signal Descriptions
Signal Name
Number Description
GTL_REF[B:A]
2
GTL Reference: Reference voltage input for the Host AGTL interface.
GTLREF is 2/3 * VTT. VTT is nominally 1.25V.
VTT
9
Host Voltage: VTT is nominally 1.25V for host signals.
AGPREF
1
AGP Reference: Reference voltage input for the AGP interface.
AGPREF is 0.5 * Vagpdd when Vdd=1.5V.
VCC_AGP
8
AGP Voltage: VDD is nominally 1.5V for AGP.
VCCQ_AGP
2
AGP Quiet Voltage: Quiet voltage for AGP interface is also 1.5V.
HLREF
1
Hub Interface Reference: Reference voltage input for the hub interface.
HLREF is 0.5 * Vdd.
VCC_HUB
2
Hub Interface Voltage: VCC supplies for the hub interface are 1.8V.
SM_REF[B:A]
2
System Memory Reference: Reference voltage input for system memory is
VCC_SM/6 = .55V.
VCC_SM
14
System Memory Voltage: VCC supplies for system memory are 3.3V.
VCCQ_SM
5
System Memory Quiet Voltage: Quiet VCC for the system memory interface is
3.3V.
VCC_GPIO
2
GPIO Voltage: VCC supplies for general purpose I/O signals are 3.3V.
VCC_DVO
3
DVO Voltage: VCC supplies for digital video output signals are 1.5V.
VCCA_DAC;
VSSA_DAC
21
DAC Voltage: VCCA and VSSA supplies for the DAC.
VCCA_DAC is 1.8V.
RAM_REF[B:A]
2
Rambus Reference: Reference voltage input for the Rambus RSL interface.
RAMREF is approximately 1.4V
VCC_CMOS;
VSS_CMOS
43
Graphics Memory CMOS Voltage: VCC and VSS supplies for local memory
CMOS signals. VCC_CMOS is 1.8V
VCC_LM
9
VCC Graphics Memory Voltage: VCC supplies for local memory. VCC_LM is
1.8V.
VDD_LM
7
VDD Graphics Memory Voltage: VDD supplies for local memory. VDD_LM is
1.25V. (Reserved)
VCCA_CPLL;
VSSA_CPLL
11
Gfx Core PLL Voltage: VCCA and VSSA supplies for core PLL. VCCA_CPLL
is 1.25v.
VCCA_HPLL;
VSSA_HPLL
11
Host/Memory/Hub/AGP PLL Voltage: VCCA and VSSA supplies for host PLL.
VCCA_HPLL is 1.25V.
VCCA_DPLL[1:0];
VSSA_DPLL[1:0]
22
Display PLL Voltage: VCCA and VSSA supplies for display PLL. VCCA_DPLL
is 1.25V.
VCC
24
Core VCC: 1.25V.
VSS
140
Ground pins.
34
Datasheet
298338-001