Intel 815 - Compensation; Figure 41. Intel 815 Chipset Platform Decoupling Example

System Memory Design Guidelines
R
Intel
®
815 Chipset Platform Design Guide 77
Figure 41. Intel
®
815 Chipset Platform Decoupling Example
6.5 Compensation
A system memory compensation resistor (SRCOMP) is used by the GMCH to adjust the buffer
characteristics to specific board and operating environment characteristics. Refer to the Intel
®
815
Chipset Family: 82815 Graphics and Memory Controller Hub (GMCH) for use with the Universal
Socket 370 Datasheet for details on compensation. Tie the SRCOMP pin of the GMCH to
40 Ω 1% or 2% pull-up resistor to 3.3 Vsus (3.3Volt standby) via a 10-mil-wide, 0.5 inch trace
(targeted for a nominal impedance of 40 Ω).