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US 2021/0174864 A1Published application
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 semiconductor device comprising:
- a first external terminal receiving a command signal;
- a second external terminal receiving a data signal;
- a third external terminal receiving an address signal;
- a command decoder configured to output a mode register setting signal based on the command signal;
- a first delay circuit configured to receive the mode register setting signal and output a delayed mode register setting signal;
- a first mode register configured to provide an enable signal;
- and
- a second mode register configured to receive the delayed mode register setting signal and the address signal;
- wherein contents of the second mode register are overwritten with the address signal on receiving the delayed mode register setting signal when the enable signal has a first logic level and the data signal has a second logic level.
6 more elements
Dependencies are inferred from the claim text.