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AM29LV800DB120ED Datasheet(PDF) 20 Page - SPANSION |
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AM29LV800DB120ED Datasheet(HTML) 20 Page - SPANSION |
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20 / 46 page  18 Am29LV800D Am29LV800D_00_A7 December 4, 2006 D A TA SH EET Once the sector erase operation has begun, only the Erase Suspend command is valid. All other com- mands are ignored. Note that a hardware reset dur- ing the sector erase operation immediately terminates the operation. The Sector Erase command sequence should be reinitiated once the device has returned to reading array data, to ensure data integrity. When the Embedded Erase algorithm is complete, the device returns to reading array data and addresses are no longer latched. The system can determine the status of the erase operation by using DQ7, DQ6, DQ2, or RY/BY#. Refer to “Write Operation Status” for information on these status bits. Figure 4 illustrates the algorithm for the erase opera- tion. Refer to the Erase/Program Operations tables in the “AC Characteristics” section for parameters, and to Figure 18 for timing diagrams. Erase Suspend/Erase Resume Commands The Erase Suspend command allows the system to in- terrupt a sector erase operation and then read data from, or program data to, any sector not selected for erasure. This command is valid only during the sector erase operation, including the 50 µs time-out period during the sector erase command sequence. The Erase Suspend command is ignored if written during the chip erase operation or Embedded Program algo- rithm. Writing the Erase Suspend command during the Sector Erase time-out immediately terminates the time-out period and suspends the erase operation. Ad- dresses are “don’t-cares” when writing the Erase Sus- pend command. When the Erase Suspend command is written during a sector erase operation, the device requires a maxi- mum of 20 µs to suspend the erase operation. How- ever, when the Erase Suspend command is written during the sector erase time-out, the device immedi- ately terminates the time-out period and suspends the erase operation. After the erase operation has been suspended, the system can read array data from or program data to any sector not selected for erasure. (The device “erase suspends” all sectors selected for erasure.) Normal read and write timings and command definitions apply. Reading at any address within erase-suspended sec- tors produces status data on DQ7–DQ0. The system can use DQ7, or DQ6 and DQ2 together, to determine if a sector is actively erasing or is erase-suspended. See “Write Operation Status” for information on these status bits. After an erase-suspended program operation is com- plete, the system can once again read array data within non-suspended sectors. The system can deter- mine the status of the program operation using the DQ7 or DQ6 status bits, just as in the standard pro- gram operation. See “Write Operation Status” for more information. The system may also write the autoselect command sequence when the device is in the Erase Suspend mode. The device allows reading autoselect codes even at addresses within erasing sectors, since the codes are not stored in the memory array. When the device exits the autoselect mode, the device reverts to the Erase Suspend mode, and is ready for another valid operation. See “Autoselect Command Sequence” for more information. The system must write the Erase Resume command (address bits are “don’t care”) to exit the erase sus- pend mode and continue the sector erase operation. Further writes of the Resume command are ignored. Another Erase Suspend command can be written after the device has resumed erasing. Notes: 1. See Table 5 for erase command sequence. 2. See “DQ3: Sector Erase Timer” for more information. Figure 4. Erase Operation START Write Erase Command Sequence Data Poll from System Data = FFh? No Yes Erasure Completed Embedded Erase algorithm in progress |
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