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US 10,593,394 B2Granted
Semiconductor device having PDA function
AssigneeLongitude Licensing Limited
InventorChikara Kondo
Life of this patent
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Abstract
A method for writing a mode register in a semiconductor device, the method includes receiving a mode register command and a mode signal; generating a first mode register setting signal; delaying the first mode register setting signal in a first latency shifter to provide a second mode register setting signal; receiving a data signal in synchronization with the second mode register setting signal; and writing the mode signal to the mode register only if the received data signal has a first logic level.
Claims14
A method for operating a system comprising a controller and a plurality of memory devices, the method comprising:
- providing at a first time a first mode register setting command, a first plurality of selection signals, and a first mode signal from the controller to the plurality of memory devices in common;
- providing at a second time later than the first time a first enable signal having a first logic level from the controller to a first memory device of the plurality of memory devices and a second enable signal having a second logic level opposite the first logic level from the controller to a second memory device of the plurality of memory devices;
- and
- storing the first mode signal in a first mode register selected by the first plurality of selection signals in the first memory device and not storing the first mode signal in a first mode register selected by the first plurality of selection signals in the second memory device.
1 more element
Dependencies are inferred from the claim text.