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What does it mean when the datasheets lists the signals between parentheses as shown in the figure below? enter image description here

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  • \$\begingroup\$ This needs context - what is the device? \$\endgroup\$ – Peter Smith Mar 23 '16 at 7:36
  • \$\begingroup\$ 28F640J3 Parallel flash memory \$\endgroup\$ – HochKonik Mar 23 '16 at 7:52
  • \$\begingroup\$ Can you add a link to the datasheet (and a reference to the page number) in the original question? \$\endgroup\$ – CharlieHanson Mar 23 '16 at 8:48
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As you can read in the datasheet a write operation can be initiated (and terminated) with either CEx or WE#, whichever goes low last, thus you can have the two waveform alternatively; if the upper of the two waveform is CEx the lower il WE#, else you should read the upper as WE# and the lower as CEx.

In the datasheet, the notes from table 17 should be enlightening.

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