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US 2017/0287545 A1Published application
Semiconductor device having pda function
AssigneeLongitude Semiconductor S.a.r.l.
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.
Claims1
A method for controlling a plurality of memory devices comprising:
- supplying a first enable signal having a first logic level to a first memory device of a plurality of memory devices, the first enable signal being supplied with a predetermined latency after supplying a mode register command and a mode signal;
- and
- supplying a second enable signal having a second logic level to a second memory device of the plurality of memory devices, the second signal being supplied with the predetermined latency after supplying the mode register command and the mode signal;
- wherein the mode register command is decoded and delayed by a latency shifter in each of the plurality of memory devices, the mode signal is written to a first mode register of the first memory device, and the mode signal is not written to a first mode register of the second memory device.
1 more element
Dependencies are inferred from the claim text.