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TMS29F002RB-12BFML Datasheet(PDF) 11 Page - Texas Instruments |
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TMS29F002RB-12BFML Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 41 page  TMS29F002RT, TMS29F002RB 262144 BY 8BIT FLASH MEMORIES SMJS849B − MARCH 1997 − REVISED JUNE 1998 11 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 erase-suspend command The erase-suspend command (B0h) allows interruption of a sector-erase operation to read data from unaltered sectors of the device. Erase-suspend is a one-bus-cycle command. The addresses can be VIL or VIH and the erase-suspend command (B0h) is latched on the rising edge of WE. Once the sector-erase operation is in progress, the erase-suspend command requests the internal write-state machine to halt operation at predetermined breakpoints. The erase-suspend command is valid only during the sector-erase operation and is invalid during programming and chip-erase operations. The sector-erase delay timer expires immediately if the erase-suspend command is issued while the delay is active. After the erase-suspend command is issued, the device takes between 0.1 µs and 15 µs to suspend the operation. The toggle bit must be monitored to determine when the suspend has been executed. When the toggle bit stops toggling, data can be read from sectors that are not selected for erase. Reading from a sector selected for erase can result in invalid data. See the operation status section for a full description. Once the sector-erase operation is suspended, reads or programs to a sector that is not being erased can be performed. This command is applicable only during sector-erase operations. Any other command written during the erase-suspend mode to the suspended sector is ignored. erase-resume command The erase-resume command (30h) restarts a suspended sector-erase operation from the point where it was halted. Erase resume is a one-bus-cycle command. The addresses can be VIL or VIH and the erase-resume command (30h) is latched on the rising edge of WE. When an erase-suspend/erase-resume command combination is written, the internal-pulse counter (exceed timing limit) is reset. The erase-resume command is valid only in the erase-suspend state. After the erase-resume command is executed, the device returns to the valid sector-erase state and further writes of the erase-resume command are ignored. After the device has resumed the sector-erase operation, another erase-suspend command can be issued to the device. operation status The status of the device during an automatic-programming algorithm, chip-erase command, or sector-erase command can be determined in two ways: D DQ6: Toggle bit D DQ7: Data polling status-bit definitions During operation of the automatic embedded program and erase functions, the status of the device can be determined by reading the data state of designated outputs. The data-polling bit (DQ7) and toggle bit (DQ6) require multiple successive reads to observe a change in the state of the designated output. Table 6 defines the values of the status flags. |
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