公开(公告)号：US09274938B2

公开(公告)日：2016-03-01

申请号：US13737306

申请日：2013-01-09

Applicant: ADVANCED MICRO DEVICES, INC.

Inventor： Shawn Searles ,  Nicholas Todd Humphries ,  Brian W. Amick ,  Richard W. Reeves ,  Hanwoo Cho ,  Ronald L. Pettyjohn

IPC: G06F12/00 ,  G06F1/32 ,  G06F13/16 ,  G06F13/40

CPC classification number: G06F12/00 ,  G06F1/3275 ,  G06F13/1689 ,  G06F13/4072 ,  G06F13/4086 ,  Y02D10/14

Abstract: A physical memory interface (Phy) and method of operating is disclosed. The Phy interface includes command and status registers (CSRs) configured to receive a first power context and second power context. Selection circuitry is configured to switch between the first and second power contexts. A plurality of adjustable delay elements are provided, each having a delay time responsive to the selected power context. A first set of CSRs configured may store the first power context and a second set of CSRs configured may store the second power context. The Phy interface may also include a plurality of drivers each having a selectable drive strength responsive to the selected power context. The Phy interface may also include a plurality of receivers each having a selectable termination impedance responsive to the selected power context. Switching between power contexts may result in adjusting of the delay elements, drive strength and/or termination impedance of one or more drivers/receivers.