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Method for adjusting the input switch-point level of the MCH using a pull-up resistor on the CPU package

IP.com Disclosure Number: IPCOM000034136D
Publication Date: 2005-Jan-17
Document File: 2 page(s) / 56K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for adjusting the input switch-point (GTLRef) level of the memory controller hub (MCH) using a pull-up resistor on the central processing unit (CPU) package. Benefits include improved functionality and improved performance.

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Method for adjusting the input switch-point level of the MCH using a pull-up resistor on the CPU package

Disclosed is a method for adjusting the input switch-point (GTLRef) level  of the memory controller hub (MCH) using a pull-up resistor on the central processing unit (CPU) package. Benefits include improved functionality and improved performance.

Background

      When new process-generation CPUs are plugged into previous-generation motherboards, the optimal GTLRef level of the MCH with the new CPU may not match the level hard-wired into the motherboard. This problem is conventionally solved by asking motherboard suppliers to change the option for the resistors on the motherboard that sets the GTLRef level for the MCH. As a result, motherboard suppliers must requalify their motherboards.

      Conventional motherboards set the GTLRef voltage for the CPU and MCH by placing resistor dividers on the motherboard to generate the appropriate voltage. Because future CPUs are required to plug into existing platforms, and the GTLRef level set in the past for previous CPUs may not be optimal for future platforms, a method is required that adjusts the GTLRef level of existing devices mounted on existing platforms already in the market to tune them to accept the latest CPUs (see Figure 1).

Description

      The disclosed method adjusts the motherboard chipset’s input/output (I/O) GTLRef through the use of a resistor placed on the CPU’s package. A pull-up resistor, ...