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MX28F2000T Datasheet(PDF) 9 Page - Macronix International |
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MX28F2000T Datasheet(HTML) 9 Page - Macronix International |
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9 / 31 page  9 MX28F2000T P/N: PM0472 REV. 1.0, Jun 13, 1997 When using the Automatic Block Erase algorithm, note that the erase automatically terminates when adequate erase margin has been achieved for the memory array (no erase verify command is required). The margin voltages are internally generated in the same manner as when the standard erase verify command is used. The Automatic set-up block erase command is a com- mand only operation that stages the device for auto- matic electrical erasure of selected blocks in the array. Automatic set-up block erase is performed by writing 20H to the command register. To enter automatic block erase, the user must write the command D0H to the command register. Block addresses are loaded into internal register on the 2nd falling edge of WE. Each successive block load cycles, started by the falling edge of WE, must begin within 30us from the rising edge of the preceding WE. Otherwise, the loading period ends and internal auto block erase cycle starts. When the data on DQ7 is "1" and the data on DQ6 stops toggling for two consecutive read cycles, at which time auto erase ends and the device returns to the Read mode. Refer to page 2 for detailed block address. SET-UP AUTOMATIC PROGRAM/PROGRAM COMMANDS The Automatic Set-up Program is a command-only operation that stages the device for automatic pro- gramming. Automatic Set-up Program is performed by writing 40H to the command register. Once the Automatic Set-up Program operation is per- formed, the next WE pulse causes a transition to an active programming operation. Addresses are internally latched on the falling edge of the WE pulse. Data is internally latched on the rising edge of the WE pulse. The rising edge of WE also begins the programming operation. The system is not required to provide further controls or timings. The device will automatically provide an adequate internally generated program pulse and verify margin. The automatic programming operation is completed when the data read on DQ6 stops toggling for two consecutive read cycles and the data on DQ7 and DQ6 are equivalent to data written to these two bits, at which time the device returns to the Read mode (no program verify command is required). RESET COMMAND A reset command is provided as a means to safely abort the erase- or program-command sequences. Following either set-up command (erase or program) with two consecutive writes of FFH will safely abort the operation. Memory contents will not be altered. Should program-fail or erase-fail happen, two consecutive writes of FFH will reset the device to abort the operation. A valid command must then be written to place the device in the desired state. WRITE OPERATON STATUS TOGGLE BIT-DQ6 The MX28F2000T features a "Toggle Bit" as a method to indicate to the host sytem that the Auto Program/ Erase algorithms are either in progress or completed. While the Automatic Program or Erase algorithm is in progress, successive attempts to read data from the device will result in DQ6 toggling between one and zero. Once the Automatic Program or Erase algorithm is completed, DQ6 will stop toggling and valid data will be read. The toggle bit is valid after the rising edge of the second WE pulse of the two write pulse sequences. DATA POLLING-DQ7 The MX28F2000T also features Data Polling as a method to indicate to the host system that the Automatic Program or Erase algorithms are either in progress or completed. While the Automatic Programming algorithm is in op- eration, an attempt to read the device will produce the complement data of the data last written to DQ7. Upon completion of the Automatic Program algorithm an attempt to read the device will produce the true data last written to DQ7. The Data Polling feature is valid after the rising edge of the second WE pulse of the two write pulse sequences. |
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