Electronic digital logic circuitry – Interface – Supply voltage level shifting
Reexamination Certificate
2006-02-28
2006-02-28
Le, Don (Department: 2819)
Electronic digital logic circuitry
Interface
Supply voltage level shifting
C326S083000, C326S038000
Reexamination Certificate
active
07005889
ABSTRACT:
A data processing apparatus and method are provided for controlling level shifting. The data processing apparatus comprises a first component provided within a first voltage domain and operable to receive a first supply voltage, and a second component provided within a second voltage domain and operable to receive a second supply voltage. At least one of the first and second supply voltages are dynamically variable. The data processing apparatus further comprises an interface cell between the first and second voltage domains which is operable to receive a signal issued by the first component in the first voltage domain and destined for the second component. The interface cell comprises level shifting logic operable to convert the signal issued by the first component into a corresponding signal to be propagated to the second component in the second voltage domain. Further, bypass logic is provided which is operable in the event that the first supply voltage and second supply voltage are at the same voltage level to enable a bypass path around the level shifting logic such that the signal issued by the first component is propagated via the bypass path as the corresponding signal to the second component in the second voltage domain.
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Oldham Harry Edward
Patel Dipesh Ishwerbhai
Salter Nicholas Andrew
Sowden Andrew John
ARM Limited
Le Don
Nixon & Vanderhye P.C.
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