Controlling DRAM at time DRAM ready to receive command when exiting power down
First Claim
1. A method of operation of an integrated circuit controller device that controls a dynamic random access memory (DRAM) device comprising an array of DRAM memory cells, the method comprising:
- providing a value to the DRAM device, wherein the value represents a time at which the DRAM device is ready to receive a command when exiting from a power down mode, wherein the DRAM device stores the value in a programmable register; and
providing the command to the DRAM device at the time, wherein the command specifies an access to the array.
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Abstract
Methods of operation of a memory device and system are provided in embodiments. Initialization operations are conducted at a first frequency of operation during an initialization sequence. Memory access operations are then performed at a second frequency of operation. The second frequency of operation is higher than the first frequency of operation. Also, the memory access operations include a read operation and a write operation. In an embodiment, information that represents the first frequency of operation and the second frequency of operation is read from a serial presence detect device.
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Citations
22 Claims
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1. A method of operation of an integrated circuit controller device that controls a dynamic random access memory (DRAM) device comprising an array of DRAM memory cells, the method comprising:
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providing a value to the DRAM device, wherein the value represents a time at which the DRAM device is ready to receive a command when exiting from a power down mode, wherein the DRAM device stores the value in a programmable register; and providing the command to the DRAM device at the time, wherein the command specifies an access to the array. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of operation of an integrated circuit controller device that controls a DRAM device comprising an array of DRAM memory cells, the method comprising:
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outputting, at a first interface of the integrated circuit controller device, a value to the DRAM device, wherein the value represents a period of time during which the DRAM device is not electrically ready to receive a command when exiting from a power down mode, wherein the DRAM device stores the value in a programmable register; and outputting, at a second interface of the integrated circuit controller device, a command to the DRAM device. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method of operation of an integrated circuit controller device that controls a DRAM device comprising an array of DRAM memory cells, the method comprising:
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calculating a value based on information, wherein the value represents a time at which the DRAM device is capable of receiving a command when exiting from a power down mode; outputting the value to the DRAM device, wherein the DRAM device stores the value in a programmable register; and providing the command to the DRAM device, wherein the command specifies an access to the DRAM array. - View Dependent Claims (19, 20, 21, 22)
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Specification