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CAT28LV256NI-25T Datasheet(PDF) 8 Page - Catalyst Semiconductor |
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CAT28LV256NI-25T Datasheet(HTML) 8 Page - Catalyst Semiconductor |
8 / 12 page CAT28LV256 8 Doc. No. 1071, Rev. B WE CE OE I/O6 tOEH tOE tOES tWC (1) (1) ADDRESS CE WE OE I/O7 DIN = X DOUT = X DOUT = X tOE tOEH tWC tOES DATA DATA DATA DATA 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 com- plete. 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, the device can determine the completion of a write cycle, while a write cycle is in progress, by reading data from the device. This results in I/O6 toggling between one and zero. Once the write is complete, however, I/O6 stops toggling and valid data can be read from the device. Figure 7. DATA Polling 28LV256 F10 Figure 8. Toggle Bit 28LV256 F11 Note: (1) Beginning and ending state of I/O6 is indeterminate. |
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