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AM29F040-120FE Folha de dados(PDF) 11 Page - Advanced Micro Devices |
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AM29F040-120FE Folha de dados(HTML) 11 Page - Advanced Micro Devices |
11 / 33 page Am29F040 11 Erase Suspend The Erase Suspend command allows the user to inter- rupt a Sector Erase operation and then perform data reads from a sector not being erased. This command is applicable ONLY during the Sector Erase operation which includes the time-out period for sector erase. The Erase Suspend command will be ignored if written dur- ing the Chip Erase operation or Embedded Program Al- gorithm. Writing the Erase Suspend command during the Sector Erase time-out results in immediate termina- tion of the time-out period and suspension of the erase operation. Any other command written during the Erase Sus- pend mode will be ignored except the Erase Resume command. Writing the Erase Resume command resumes the erase operation. The addresses are “don’t-cares” when writing the Erase Suspend or Erase Resume command. When the Erase Suspend command is written during the Sector Erase operation, the device will take a max- imum of 15 µs to suspend the erase operation. When the device has entered the erase-suspended mode, DQ7 bit will be at logic “1”, and DQ6 will stop toggling. The user must use the address of the erasing sector for reading DQ6 and DQ7 to determine if the erase opera- tion has been suspended. Further writes of the Erase Suspend command are ignored. When the erase operation has been suspended, the device defaults to the erase-suspend-read mode. Reading data in this mode is the same as reading from the standard read mode except that the data must be read from sectors that have not been erase-suspended. To resume the operation of Sector Erase, the Resume command (30H) should be written. Any further writes of the Resume command at this point will be ignored. An- other Erase Suspend command can be written after the chip has resumed erasing. Write Operation Status Table 5. Write Operation Status DQ7 Data Polling The Am29F040 device features Data Polling as a method to indicate to the host that the Embedded Algorithms are in progress or completed. During the Embedded Program Algorithm an attempt to read the device produces the compliment of the data last written to DQ7. Upon completion of the Embedded Program Algorithm, reading the device produces the true data last written to DQ7. During the Embedded Erase Algo- rithm, reading the device produces a “0” at the DQ7 output. Upon completion of the Embedded Erase Algo- rithm, reading the device produces a “1” at the DQ7 output. The flowchart for Data Polling (DQ7) is shown in Figure 3. For chip erase, the Data Polling is valid after the rising edge of the sixth WE pulse in the six write pulse se- quence. For sector erase, the Data Polling is valid after the last rising edge of the sector erase WE pulse. Data Polling must be performed at sector address within any of the sectors being erased and not a protected sector. Otherwise, the status may not be valid. Once the Em- bedded Algorithm operation is close to being com- pleted, the Am29F040 data pins (DQ7) may change asynchronously while the output enable (OE) is as- serted low. This means that the device is driving status information on DQ7 at one instant of time and then that byte’s valid data at the next instant of time. Depending on when the system samples the DQ7 output, it may read the status or valid data. Even if the device has completed the Embedded Algorithm operation and DQ7 has a valid data, the data outputs on DQ0–DQ6 may be still invalid. The valid data on DQ0–DQ7 will be read on the successive read attempts. The Data Polling feature is active during the Embedded Programming Algorithm, Embedded Erase Algorithm, Erase Suspend, or sector erase time-out (see Table 5). Status DQ7 DQ6 DQ5 DQ3 In Progress Byte Programming in Embedded Algorithm DQ7 Toggle 0 0 Embedded Erase Algorithm 0 Toggle 0 1 Erase Suspended Mode Erase Suspended Sector 1 No Toggle 0 1 Non-Erase Suspended Sector Data Data Data Data Exceeded Time Limits Byte-Programming in Embedded Algorithm DQ7 Toggle 1 0 Embedded Erase Algorithm 0 Toggle 1 1 |
Nº de peça semelhante - AM29F040-120FE |
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Descrição semelhante - AM29F040-120FE |
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