Information handling system including doze mode control

Details Information handling system including doze mode control Information handling system including doze mode control

1995-09-29

1998-01-27

Ray, Gopal C.

Boots, shoes, and leggings

395293, 364707, G06F 132, G06F 1336

Patent

active

057130299

ABSTRACT:
An information handling system includes a system memory controller having a control register in which a bit is reserved for Doze mode control. The Doze control bit is set by system software whenever it places any processor into Doze mode. Until this bit is set, there is no wake up signal issued nor any performance lost. Whenever this control bit is set, the memory controller sends a signal to the system arbiter that informs it to issue a "wake up signal" before issuing an address bus grant, in time to satisfy the processor wake up latency. In addition, if the system arbiter receives another address bus request within a predefined time window, the "wake up signal" is held active without adding to the bus grant latency. If maximum system performance is desired (all processors out of Doze mode), the system software resets the Doze mode control bit in the memory controller, which removes the signal to the system arbiter which controls the wake up signal and removes the added latency for granting the bus.

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patent: 5375222 (1994-12-01), Robinson et al.
patent: 5416910 (1995-05-01), Moyer et al.
patent: 5463753 (1995-10-01), Fry et al.
patent: 5471625 (1995-11-01), Mussemann et al.
patent: 5530932 (1996-06-01), Carmean et al.
patent: 5625807 (1997-04-01), Lee et al.

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