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X84041VI Datasheet(PDF) 4 Page - Xicor Inc. |
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X84041VI Datasheet(HTML) 4 Page - Xicor Inc. |
4 / 13 page X84041 4 Figure 2. Write Sequence CE OE WE I/O (IN) "0" "0" "1" RESET LOAD ADDRESS LOAD DATA START NONVOLATILE WRITE X XXXXX X A8 A7 A6 A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 I/O (OUT) 2704 ILL F04 SYMBOL TABLE WAVEFORM INPUTS OUTPUTS Must be steady Will be steady May change from LOW to HIGH Will change from LOW to HIGH May change from HIGH to LOW Will change from HIGH to LOW Don’t Care: Changes Allowed Changing: State Not Known N/A Center Line is High Impedance Write Protection The following circuitry has been included to prevent inadvertent nonvolatile writes: — The internal Write Enable latch is reset upon power-up. — A reset sequence must be issued to set the internal write enable latch before starting a write sequence. — A special “start nonvolatile write” command sequence is required to start a nonvolatile write cycle. — The internal Write Enable latch is reset automatically at the end of a nonvolatile write cycle. — The internal Write Enable latch is reset and remains reset as long as the WP pin is LOW, which blocks all nonvolatile write cycles. |
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