Product specifications

ProSavageDDR P4M266 – VT8751 P4 DDR SMA North Bridge
Revision 1.1, July 19, 2002 -19- Pin Descriptions
We Connect
We ConnectWe Connect
We Connect
Technologies, Inc.
Analog Power / Ground
Signal Name Pin # I/O Signal Description
VCCHCK
N24 P Power for Host CPU Clock PLL (2.5V ±5%)
GNDHCK
M24 P Ground for Host CPU Clock Circuitry. Connect to main ground plane through a ferrite
bead.
VCCMCK
AD24 P Power for Memory Clock PLL (2.5V ±5%)
GNDMCK
AC24 P Ground for Memory Clock Circuitry. Connect to main ground plane through a ferrite bead.
VCCMDLL
AE15 P Power for Memory Strobe DLL (2.5V ±5%)
GNDMDLL
AD15 P Ground for Memory Strobe DLL Circuitry. Connect to main ground plane through a ferrite
bead.
VCCRGB
E6 P Power for CRT RGB Outputs (2.5V ±5%).
GNDRGB
C5 P Connection Point for RGB Load Resistors. Connect to main ground plane.
VCCDAC
C6 P Power for DAC Digital Logic. (2.5V ±5%)
GNDDAC
D6PGround for DAC Analog Circuitry. Connect to main ground plane through a ferrite bead.
VCCPLL1
C7 P Power for PLL1 (2.5V ±5%).
GNDPLL1
B7 P Ground for PLL1. Connect to main ground plane through a ferrite bead.
VCCPLL2
E7 P Power for PLL2 (2.5V ±5%).
GNDPLL2
D7PGround for PLL2. Connect to main ground plane through a ferrite bead.
DigitalPower/Ground
Signal Name Pin # I/O Signal Description
VTT
E16,23, F17-18,23, K14-20,24, L20,
M20, N20, P20, R20, T20,24,
U20,24, Y25, AA24, AB24
P Power for CPU I/O Interface Logic (25 Pins). 1.65V ±5%
GNDTT
E19, P24 P Ground for CPU I/O Interface Logic (2 Pins).
VCCMEM
V20, W10,20, Y10-20, AA9-20 P Power for Memory I/O Interface Logic (26 Pins). 2.5 ±5%.
VCCVL
U9-10, V9-10, W9, Y9 P Power for V-Link I/O Interface Logic (6 Pins). 2.5V ±5%
VCCFP
K11-13 P Power for Flat Panel I/O Interface Logic (3 Pins). 3.3V ±5%
VCCAGP
K6,9, L6,9-10, M6,9-10, N9-10, P9-
10, R9-10, T6,9-10, U6, V6
P Power for AGP Bus I/O Interface Logic (19 Pins). 1.5 / 3.3V
±5% (Device 0 RxB2[1] should be set to indicate the voltage).
VCCQQ
A4 P AGP Quiet Power. Connect to main AGP power (VCCAGP =
1.5 / 3.3V ±5%) through a ferrite bead.
GNDQQ
A3 P Ground for AGP Quiet Power. Connect to main ground plane.
VCC25
F9-11,14-15,20-21, H6,24, J6,24,
N6, P6, W6,24, Y6,24, AA6,
AD9-11,13-14,20-22
P Power for Internal Logic (26 Pins). 2.5V ±5%
VSUS25
AB5 P Suspend Power. 2.5V ±5%
GND
B2,4,16,28, C4,11,14,16,21-22,
D5,15,18-19,21,24,26, E2,24-26,
F4,6-8,12-13, G26, H2,27-28, J4,
K10,26, L2,28, M4,12-18,
N12-18,26, P2,12-18,28, R4,12-18,
T12-18,26, U2,12-18,25,27,
V4,12-18, W4,26, Y2,4,28,
AB6,25-26, AC2,6,26,28,
AD6, AE4,17-19,
AF2,7,10,13,16,19,22,25,28,
AH2,4,7,10,13,16,19,22,25,28
P
Digital Ground (133 Pins)