Emulation of memory clock enable pin and use of chip select for memory power control
First Claim
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1. A method comprising:
- setting a predetermined number of consecutive clock cycles to occur on a clock signal line;
deasserting a chip select for the predetermined number of consecutive clock cycles;
powering down a memory device in response to the deasserting of the chip select line for the predetermined number of clock cycles;
asserting the chip select line; and
powering up the memory device in response to the asserting of the chip select line.
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Abstract
A method and apparatus for powering down a memory device by deasserting a chip select line for a predetermined number of consecutive clock cycles and for powering up the memory device by asserting the chip select line.
102 Citations
29 Claims
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1. A method comprising:
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setting a predetermined number of consecutive clock cycles to occur on a clock signal line;
deasserting a chip select for the predetermined number of consecutive clock cycles;
powering down a memory device in response to the deasserting of the chip select line for the predetermined number of clock cycles;
asserting the chip select line; and
powering up the memory device in response to the asserting of the chip select line. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A memory controller comprising:
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circuitry to carry out operations with a memory device; and
an interface that couples the circuitry to a memory device, the interface being comprised of a clock signal line and a chip select line, the chip select line being used by the memory controller to power down the memory device by deasserting the chip select line for a predetermined number of consecutive clock cycles occurring on the clock signal line, and to power up the memory device by asserting the chip select line. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A memory device comprising:
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a plurality of storage locations;
an interface to a memory controller comprised of a clock signal line and a chip select line, where the memory device powers down if the chip select line is deasserted for a predetermined number of consecutive clock cycles occurring on the clock signal line, and where the memory device powers up if the chip select line is asserted. - View Dependent Claims (14, 15, 16)
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17. A computer system comprising:
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a processor;
a memory device;
an interface serving to couple the processor to the memory device, the interface being comprised of a clock signal line and a chip select line, the chip select line being used to power down the memory device by deasserting the chip select line for a predetermined number of consecutive clock cycles occurring on the clock signal line, and to power up the memory device by asserting the chip select line. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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- 25. A computer-readable medium containing a sequence of instructions, which when executed by a processor causes the processor to power down a memory device by deasserting a chip select line of a memory interface that serves to couple the processor to the memory device for a predetermined number of consecutive clock cycles occurring on a clock signal line of the memory interface, and to power up the memory device by asserting the chip select line.
Specification