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Method for stop clock third-droop removal

IP.com Disclosure Number: IPCOM000018669D
Publication Date: 2003-Jul-30
Document File: 2 page(s) / 64K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for stop clock third-droop removal. Benefits include improved functionality and improved performance.

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Method for stop clock third-droop removal

Disclosed is a method for stop clock third-droop removal. Benefits include improved functionality and improved performance.

Background

      Conventionally, power delivery for processors is based on a transient event that only occurs when the processor comes out of a low-power state with the clocks off. When the stop clock is asserted, all of the clocks on the CPU turn on, and the CPU ramps back up to the highest ICC-signal level. This change takes approximately 50 clock cycles. For a 2-GHz processor, the duration is ~500 picoseconds. The voltage regulator module (VRM) responds in approximately 15 microseconds. During this time, the capacitors on the motherboard, package, and die run out of stored charge, and the voltages droop.

General description

      The disclosed method is stop clock third-droop removal. The VRM drives the stop-clock signal when it adjusts its output for the transient event that occurs when the stop-clock signal reaches the CPU. The VRM compensates and eliminates the third droop. The key elements of the method include:

•             CPU

•             VRM

•             Stop-clock signal

Advantages

              Some implementations of the disclosed structure and method provide one or more of the following advantages:

•             Improved functionality due to enabling the VRM to send the stop-clock signal

•             Improved performance due to eliminating stop clock third-droop removal

•             Improved performance due to elim...