Information processing apparatus with central processing...

Details Information processing apparatus with central processing... Information processing apparatus with central processing...

2008-04-08

2008-04-08

Suryawanshi, Suresh K (Department: 2115)

Electrical computers and digital processing systems: support

Computer power control

C713S320000, C365S227000

Reexamination Certificate

active

07356717

ABSTRACT:
A power saving type information processing apparatus is provided which is not expensive and can provide a high interruption performance without using an expensive and dedicated memory and a complicated software process. After an SDRAM setting register of an SDRAM controller outputs a SELF allowance signal for allowing SDRAM to transfer to a power saving mode from a normal operation mode, a WAITI command fetch detecting circuit outputs a WAITI command detecting signal. In this case, SDRAM is made to transfer to the power saving mode. If a CPU detects an external interruption while SDRAM is in the power saving mode, SDRAM is returned to the normal operation mode irrespective of settings of the SDRAM setting register.

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