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AM41DL1634DB70IT 데이터시트(PDF) 30 Page - Advanced Micro Devices |
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AM41DL1634DB70IT 데이터시트(HTML) 30 Page - Advanced Micro Devices |
30 / 63 page Am41DL16x4D 29 P R E L IMINARY Refer to the Write Operation Status section for infor- mation 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. Figure 4 illustrates the algorithm for the erase opera- ti o n . R e fe r to the F l a s h E r as e a nd P r og r a m Operations tables in the AC Characteristics section for par ameter s , and Fi gur e 20 s ec ti on for ti mi ng 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 50 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. However, when the Erase Suspend command is writ- ten during the sector erase time-out, the device immediately terminates the time-out period and sus- pends the erase operation. 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 Write Operation Status section for infor- mation 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 Write Operation Status section for more information. In the erase-suspend-read mode, the system can also issue the autoselect command sequence. Refer to the Autoselect Mode and Autoselect Command Sequence sections for details. To resume the sector erase operation, the system must write the Erase Resume command. The bank address of the erase-suspended bank is required when writing this command. Further writes of the Re- sume command are ignored. Another Erase Suspend command can be written after the chip has resumed erasing. Figure 4. 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 16 for erase command sequence. 2. See the section on DQ3 for information on the sector erase timer. |
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