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TMS29F008B Datasheet(PDF) 10 Page - Texas Instruments |
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TMS29F008B Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 44 page  TMS29F008T, TMS29F008B 1048576 BY 8-BIT FLASH MEMORIES SMJS845A – MARCH 1997 – REVISED OCTOBER 1997 10 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 command definitions (continued) Table 5. Command Definitions COMMAND BUS 1ST CYCLE 2ND CYCLE 3RD CYCLE 4TH CYCLE 5TH CYCLE 6TH CYCLE COMMAND CYCLES ADDR DATA ADDR DATA ADDR DATA ADDR DATA ADDR DATA ADDR DATA Read/reset 1 XXXH F0H Read/reset 3 555H AAH 2AAH 55H 555H F0H RA RD Algorithm 3 555H AAH 2AAH 55H 555H 90H 01H D6H T go selection 3 555H AAH 2AAH 55H 555H 90H 01H 58H B Program 4 555H AAH 2AAH 55H 555H A0H PA PD Chip erase 6 555H AAH 2AAH 55H 555H 80H 555H AAH 2AAH 55H 555H 10H Sector erase 6 555H AAH 2AAH 55H 555H 80H 555H AAH 2AAH 55H SA 30H Sector-erase suspend 1 XXXH B0H Erase-suspend valid during sector-erase operation Sector-erase resume 1 XXXH 30H Erase-resume valid only after erase-suspend LEGEND: RA = Address of the location to be read PA = Address of the location to be programmed SA = Address of the sector to be erased Addresses A13–A19 select 1 to 19 sectors. RD = Data to be read at selected address location PD = Data to be programmed at selected address location read/reset command The read or reset mode is activated by writing either of the two read/reset command sequences into the command register. The device remains in this mode until another valid command sequence is input in the command register. Memory data is available in the read mode and can be read with standard microprocessor read-cycle timing. On power up, the device defaults to the read/reset mode. A read/reset command sequence is not required and memory data is available. algorithm-selection command The algorithm-selection command allows access to a binary code that matches the device with the proper programming and erase command operations. After writing the three-bus-cycle command sequence, the first byte of the algorithm-selection code can be read from address XX00h. The second byte of the code can be read from address XX01h (see Table 5). This mode remains in effect until another valid command sequence is written to the device. byte-program command Programming is a four-bus-cycle command sequence. The first three bus cycles put the device into the program-setup state. The fourth bus cycle loads the address location and the data to be programmed into the device. The addresses are latched on the falling edge of WE and the data is latched on the rising edge of WE in the fourth bus cycle. The rising edge of WE starts the program operation. The embedded programming function automatically provides needed voltage and timing to program and verify the cell margin. Any further commands written to the device during the program operation are ignored. |
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