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CAT28C256PA15 Datasheet(PDF) 8 Page - ON Semiconductor |
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CAT28C256PA15 Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 14 page CAT28C256 http://onsemi.com 8 DATA Polling DATA polling is provided to indicate the completion of write cycle. Once a byte write or page write cycle is initiated, attempting to read the last byte written will output the complement of that data on I/O7 (I/O0–I/O6 are indeterminate) until the programming cycle is complete. Upon completion of the self−timed write cycle, all I/O’s will output true data during a read cycle. Toggle Bit In addition to the DATA Polling feature of the CAT28C256, the device offers an additional method for determining the completion of a write cycle. While a write cycle is in progress, reading data from the device will result in I/O6 toggling between one and zero. However, once the write is complete, I/O6 stops toggling and valid data can be read from the device. Figure 8. DATA Polling ADDRESS I/O7 WE OE CE DIN = X DOUT = X DOUT = X tOEH tOE tWC tOES Figure 9. Toggle Bit tOES tOE tWC tOEH I/O6 OE CE WE (Note 14) (Note 14) 14.Beginning and ending state of I/O6 is indeterminate. |
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