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XM28C020 Datasheet(PDF) 5 Page - Xicor Inc. |
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XM28C020 Datasheet(HTML) 5 Page - Xicor Inc. |
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5 / 16 page  XM28C020 5 THE TOGGLE BIT I/O6 Figure 4. Toggle Bit Bus Sequence Figure 5. Toggle Bit Software Flow The Toggle Bit can eliminate the software housekeeping chore of saving and fetching the last address and data written to a device in order to implement DATA Polling. This can be especially helpful in an array comprised of multiple XM28C020 memories that is frequently up- dated. The timing diagram in Figure 4 illustrates the sequence of events on the bus. The software flow diagram in Figure 5 illustrates a method for testing the Toggle Bit. CE OE WE I/O6 READY VOH VOL LAST WRITE HIGH Z * Beginning and ending state of I/O6 will vary. * * 3872 FHD F12 3872 FHD F13 LOAD ACCUM FROM ADDR n COMPARE ACCUM WITH ADDR n READY COMPARE OK? NO YES LAST WRITE |
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