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전자부품 데이터시트 검색엔진 |
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AM49DL6408H 데이터시트(PDF) 28 Page - SPANSION |
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AM49DL6408H 데이터시트(HTML) 28 Page - SPANSION |
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28 / 57 page  26 Am49DL6408H March 12, 2004 AD V A NCE I N FO RM ATI O N data from the non-erasing bank. The system can de- termine the status of the erase operation by reading DQ7, DQ6, DQ2, or RY/BY# in the erasing bank. Refer to the Flash Write Operation Status section for information on these status bits. Once the sector erase operation has begun, only the Erase Suspend command is valid. All other com- mands are ignored. However, note that a hardware reset immediately terminates the erase operation. If that occurs, the sector erase command sequence should be reinitiated once that bank has returned to reading array data, to ensure data integrity. Note that the SecSi Sector, autoselect, and CFI functions are unavailable when an erase operation in is progress. Figure 5 illustrates the algorithm for the erase opera- tion. Refer to the Erase and Program Operations ta- bles in the AC Characteristics section for parameters, and Figure 19 section for timing diagrams. Erase Suspend/Erase Resume Commands The Erase Suspend command, B0h, allows the sys- tem to interrupt a sector erase operation and then read data from, or program data to, any sector not selected for erasure. The bank address is required when writing this command. This command is valid only during the sector erase operation, including the 80 µs time-out period during the sector erase command sequence. The Erase Suspend command is ignored if written dur- ing the chip erase operation or Embedded Program algorithm. When the Erase Suspend command is written during the sector erase operation, the device requires a max- imum 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. Addresses are “don’t-cares” when writing the Erase suspend command. After the erase operation has been suspended, the bank enters the erase-suspend-read mode. The sys- tem can read data from or program data to any sector not selected for erasure. (The device “erase sus- pends” all sectors selected for erasure.) Reading at any address within erase-suspended sectors pro- duces status information 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. Refer to the Flash Write Operation Status section for information on these status bits. After an erase-suspended program operation is com- plete, the bank returns to the erase-suspend-read mode. The system can determine the status of the program operation using the DQ7 or DQ6 status bits, just as in the standard Byte Program operation. Refer to the Flash Write Operation Status section for more information. In the erase-suspend-read mode, the system can also issue the autoselect command sequence. 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 au- toselect mode, the device reverts to the Erase Sus- pend mode, and is ready for another valid operation. Refer to the Sector/Sector Block Protection and Un- protection and Autoselect Command Sequence sec- tions for details. To resume the sector erase operation, the system must write the Erase Resume command (address bits are don’t care). The bank address of the erase-sus- pended bank is required when writing this command. Further writes of the Resume command are ignored. Another Erase Suspend command can be written after the chip has resumed erasing. Figure 5. Erase Operation START Write Erase Command Sequence (Notes 1, 2) Data Poll to Erasing Bank from System Data = FFh? No Yes Erasure Completed Embedded Erase algorithm in progress Notes: 1. See Table 11 for erase command sequence. 2. See the section on DQ3 for information on the sector erase timer. |
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