System for isolating integrated circuit power domains
First Claim
1. A system for isolating a first power domain of an integrated circuit (IC) from a second power domain of the IC, the system comprising:
- a first multiplexer having a first two-bit input terminal for receiving first and second bit signals, a second two-bit input terminal for receiving third and fourth bit signals, a select terminal for receiving an isolation enable signal, and a two-bit output terminal for outputting fifth and sixth bit signals; and
an isolation circuit, comprising;
a logic gate connected to the two-bit output terminal of the first multiplexer for receiving the fifth and sixth bit signals, and for generating an enable signal;
a latch having a first input terminal for receiving an input signal, an enable terminal connected to the logic gate for receiving the enable signal, and an output terminal for outputting a latched signal; and
a second multiplexer having a first input terminal for receiving the input signal, a second input terminal for receiving a logic low signal, a third input terminal for receiving a logic high signal, a fourth input terminal connected to the latch for receiving the latched signal, a two-bit select terminal connected to the first multiplexer for receiving the fifth and sixth bit signals, and an output terminal for outputting an isolation signal,wherein the isolation circuit is configurable for outputting at least one of the input signal, the logic low signal, the logic high signal, and the latched signal as the isolation signal for isolating the first power domain from the second power domain based on the fifth and sixth bit signals.
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Accused Products
Abstract
A system for isolating a first power domain from a second power domain in an integrated circuit includes receiving an input signal from the first power domain and receiving a set of bits from a programmable register. An isolation enable signal indicative of isolating the first power domain from the second power domain is generated, and an intermediate signal based on the isolation enable signal and the input signal is generated. At least one of the input signal, a logic low signal, a logic high signal, and the intermediate signal is output based on the isolation enable signal and the set of bits.
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Citations
20 Claims
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1. A system for isolating a first power domain of an integrated circuit (IC) from a second power domain of the IC, the system comprising:
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a first multiplexer having a first two-bit input terminal for receiving first and second bit signals, a second two-bit input terminal for receiving third and fourth bit signals, a select terminal for receiving an isolation enable signal, and a two-bit output terminal for outputting fifth and sixth bit signals; and an isolation circuit, comprising; a logic gate connected to the two-bit output terminal of the first multiplexer for receiving the fifth and sixth bit signals, and for generating an enable signal; a latch having a first input terminal for receiving an input signal, an enable terminal connected to the logic gate for receiving the enable signal, and an output terminal for outputting a latched signal; and a second multiplexer having a first input terminal for receiving the input signal, a second input terminal for receiving a logic low signal, a third input terminal for receiving a logic high signal, a fourth input terminal connected to the latch for receiving the latched signal, a two-bit select terminal connected to the first multiplexer for receiving the fifth and sixth bit signals, and an output terminal for outputting an isolation signal, wherein the isolation circuit is configurable for outputting at least one of the input signal, the logic low signal, the logic high signal, and the latched signal as the isolation signal for isolating the first power domain from the second power domain based on the fifth and sixth bit signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for isolating a first power domain of an integrated circuit from a second power domain of the integrated circuit, wherein the first power domain outputs an input signal, the system comprising:
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a power gating control circuit for generating an isolation enable signal; and a multiplexer having a first input terminal for receiving a first bit signal that is configurable for selecting an isolation type, a second input terminal connected to the first power domain for receiving the input signal, a select terminal connected to the power gating control circuit for receiving the isolation enable signal, and an output terminal for outputting at least one of the input signal and the first bit signal as an isolation signal, wherein the multiplexer isolates the first power domain from the second power domain when the isolation enable signal is at a logic high state. - View Dependent Claims (13, 14, 15)
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16. A method for isolating a first power domain of an integrated circuit from a second power domain of the integrated circuit using an isolation circuit and a power gating control circuit, the method comprising:
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receiving an input signal from the first power domain; receiving a set of bit signals for selecting an isolation type of the isolation circuit, wherein the isolation circuit is configurable as first and second isolation types based on the set of bit signals and an isolation enable signal; receiving the isolation enable signal from the power gating control circuit, wherein the isolation enable signal is indicative of isolating the first power domain from the second power domain; generating an intermediate signal based on the input signal and the isolation enable signal; outputting the input signal to the second power domain when the isolation enable signal is disabled; and outputting at least one of a logic high signal, a logic low signal, and the intermediate signal to the second power domain based on the set of bit signals when the isolation enable signal is enabled. - View Dependent Claims (17, 18, 19, 20)
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Specification