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M29DW641F Datasheet(PDF) 39 Page - Numonyx B.V |
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M29DW641F Datasheet(HTML) 39 Page - Numonyx B.V |
39 / 80 page ![]() M29DW641F Command interface 39/80 Verify Lock bit 4 555 AA 2AA 55 555 58 BA DQ0 Set Standard Protection mode(5) 6 555 AA 2AA 55 555 60 SL 68 SL 48 SL DQ0 Verify Standard Protection mode(4) 4 555 AA 2AA 55 555 60 SL DQ0 1. The grey cell represent Read cycles. The other cells are Write cycles. 2. SA Protection Group Address, BA Any address in the Block, BKA Bank Address, SL Standard Protection mode Lock bit Address, PL Password Protection mode Lock Bit Address, PW Password Data, PWA Password Address, RPW Password Data Being Verified, NVMP Non-Volatile Modify Protection Bit Address, OW Extended Block Protection Bit Address, X Don’t Care. All values in the table are in hexadecimal. 3. Refer to Table 11: Protection command addresses for addresses. 4. A Reset command must be issued to return to the Read mode. 5. The 4th Bus Write cycle programs a protection bit (Extended Block Protection bit, Password, Standard Protection mode Lock bits, and a block NVMP bit). The 5th and 6th cycles verify that the bit has been successively programmed when DQ0=1. If DQ0=0 in the 6th cycle, the program command must be issued again and verified again. A 100µs delay is required between the 4th and the 5th cycle. 6. Cycle 4 erases all Non-Volatile Modify Protection bits. Cycles 5 and 6 verify that the bits have been successfully cleared when DQ0=0. If DQ0=1 in the 6th cycle, the erase command must be issued again and verified again. Before issuing the erase command, all Non-Volatile Modify Protection bits should be programmed to prevent over erasure. 7. A 12ms timeout is required between cycles 4 and 5. Table 10. Block Protection commands (continued) Command Bus Write Operations(1)(2)(3) 1st 2nd 3rd 4th 5th 6th 7th Add Data Add Data Add Data Add Data Add Data Add Data Add Data Table 11. Protection command addresses Bit Condition Address inputs A7-A0 Other Address Inputs Password Protection mode Lock bit Address (PL) RP at VIH 00001010 X RP at VID 10001010 X Standard Protection mode Lock bit Address (SL) 00010010 X Non-Volatile Modify Protection bit Address (NVMP) 00000010 Block Protection Group Address Extended Block Protection bit Address (OW) 00011010 X |
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