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AM29LV800DB-120ED Datasheet(PDF) 22 Page - Advanced Micro Devices |
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AM29LV800DB-120ED Datasheet(HTML) 22 Page - Advanced Micro Devices |
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22 / 51 page  20 Am29LV800D Am29LV800D_00_A4_E January 21, 2005 PR EL IM IN A R Y The system can monitor DQ3 to determine if the sector erase timer has timed out. (See the “DQ3: Sector Erase Timer” section.) The time- out begins from the rising edge of the final WE# pulse in the command sequence. Once the sector erase operation has begun, only the Erase Suspend command is valid. All other commands are ignored. Note that a hardware reset during the sector erase operation imme- diately 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 com- plete, 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 informa- tion on these status bits. Figure 1 illustrates the algorithm for the erase operation. Refer to the Erase/Program Opera- tions tables in the “AC Characteristics” section for parameters, and to Figure 1 for timing dia- grams. Erase Suspend/Erase Resume Commands The Erase Suspend command allows the system to interrupt 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 t h e e ras e o p era t io n . A d d r e s s e s ar e “don’t-cares” when writing the Erase Suspend command. When the Erase Suspend command is written during a sector erase operation, the device requires a maximum of 20 µs to suspend the erase operation. However, when the Erase Suspend command is written during the sector erase time-out, the device immediately termi- nates 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 sectors pro- duces status data on DQ7–DQ0. The system can use DQ7, or DQ6 and DQ2 together, to deter- mine 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 complete, the system can once again read array data within non-suspended sectors. The system can determine the status of the program opera- tion using the DQ7 or DQ6 status bits, just as in the standard program 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 o p era t ion . See “A uto s elec t C o mm a n d Sequence” for more information. The system must write the Erase Resume command (address bits are “don’t care”) to exit the erase suspend 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. |
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