Electronic digital logic circuitry – Interface – Current driving
Reexamination Certificate
2005-09-16
2010-02-09
Tan, Vibol (Department: 2819)
Electronic digital logic circuitry
Interface
Current driving
C326S062000, C326S080000, C326S081000, C326S082000, C326S084000, C326S085000
Reexamination Certificate
active
07659746
ABSTRACT:
An integrated circuit includes multiple power domains. Supply current switch circuits (SCSCs) are distributed across each power domain. When a signal is present on a control node within a SCSC, the SCSC couples a local supply bus of the power domain to a global supply bus. An enable signal path extends through the SCSCs so that an enable signal can be propagated down a chain of SCSCs from control node to control node, thereby turning the SCSCs on one by one. When the domain is to be powered up, a control circuit asserts an enable signal that propagates down a first chain of SCSCs. After a programmable amount of time, the control circuit asserts a second enable signal that propagates down a second chain. By spreading the turning on of SCSCs over time, large currents that would otherwise be associated with coupling the local and global buses together are avoided.
REFERENCES:
patent: 5646543 (1997-07-01), Rainal
patent: 5781062 (1998-07-01), Mashiko et al.
patent: 5973507 (1999-10-01), Yamazaki
patent: 7276932 (2007-10-01), Kuang et al.
patent: 2003/0074594 (2003-04-01), Hirakawa et al.
patent: 2004/0263237 (2004-12-01), Kim et al.
patent: 2006/0022712 (2006-02-01), Berthold et al.
patent: 0955573 (1999-11-01), None
Royannez et al., “90nm Low Leakage SoC Design Techniques for Wireless Applications”, Texas Instruments, Villeneuve Loubet, France, 2005 IEEE International Solid-State Circuits Converence.
Suhwan, Kim et al., “Minimizing inductive noise in system-on-a-chip with multiple power gating structures”. European Solid-State Circuits, 2003. ESSCIRC 2003. Piscataway, NJ, USA, IEEE, Sep. 16, 2003, pp. 635-638, XP010677246, ISBN: 0-7803-7995-0.
Kozhaya, J. N. et al.: “An Electrically Robust Method for Placing Power Gating Switches in Voltage Islands,” Custom Integrated Circuits Conference, 2004.Proceedings of the IEEE 2004 Orlando, FL, USA, Oct. 3-6, 2004, Piscataway, NJ, USA, IEEE, Oct. 2, 2004.
International Search Report, PCT/US2006/004891 - International Search Authority - European Patent Office, Dec. 17, 2006.
Written Opinion, PCT/US2006/004891 - International Search Authority - European Patent Office, Dec. 27, 2006.
Chua-Eoan Lew G.
Dobre Sorin Adrian
Goel Rajat
Petrov Tsvetomir P.
Severson Matthew Levi
Hooks William M.
QUALCOMM Incorporated
Seo Howard H.
Tabler Matthew C
Tan Vibol
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