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CAT28C512NA-12T Arkusz danych(PDF) 8 Page - Catalyst Semiconductor |
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CAT28C512NA-12T Arkusz danych(HTML) 8 Page - Catalyst Semiconductor |
8 / 11 page CAT28C512/513 8 Doc. No. 1007, Rev. A 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 of the CAT28C512/ 513, the device offers an additional method for determin- ing 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 7. DATA Polling Figure 8. Toggle Bit Note: (1) Beginning and ending state of I/O6 is indeterminate. ADDRESS 28C512-513 F10 CE WE OE I/O7 DIN = X DOUT = X DOUT = X tOE tOEH tWC tOES 28C512-513 F11 WE CE OE I/O6 tOEH tOE tOES tWC (1) (1) |
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