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TMS29F010-70CSFML Datasheet(PDF) 10 Page - Texas Instruments |
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TMS29F010-70CSFML Datasheet(HTML) 10 Page - Texas Instruments |
10 / 36 page TMS29F010 131072 BY 8-BIT FLASH MEMORY SMJS840A – NOVEMBER 1997 – REVISED JUNE 1998 10 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 exceed-time-limit (DQ5) The program and erase operations use an internal pulse counter to limit the number of pulses applied. If the pulse count limit is exceeded, DQ5 is set to a logic 1, indicating that the program or erase operation has failed. DQ7 will not change from complemented data to true data and DQ6 will not stop toggling when read. To continue operation, the device must be reset. The exceed-time-limit condition occurs when attempting to program a logic 1 into a bit that has been programmed previously to a logic 0. Only an erase operation can change bits from logic 0 to logic 1. After reset, the device is functional and can be erased and reprogrammed. sector-load-timer (DQ3) The sector-load-timer status bit, DQ3, is used to determine if the time to load additional sector addresses has expired. After completion of a sector-erase command sequence, DQ3 remains at a logic 0 for 80 µs. This indicates that another sector-erase command sequence can be issued. DQ3 set at a logic 1 indicates that the delay has expired and attempts to issue additional sector-erase commands are ignored. See the sector-erase command section for a description. The data-polling bit and toggle bit are valid during the 80- µs time delay and can be used to determine if a valid sector-erase command has been issued. To ensure additional sector-erase commands have been accepted, the status of DQ3 should be read before and after each additional sector-erase command. If DQ3 is at a logic low on both reads, then the additional sector-erase command was accepted. data protection hardware-sector protect feature This feature disables both programming and erase operations on any combination of one to eight sectors. Commands to program or erase a protected sector do not change the data contained in the sector. The data-polling and toggle bits operate for 2 µs to 100 µs and then return to valid data. This feature is enabled using high-voltage VID (11.5 V to 12.5 V) on address pin A9 and control pin G, and VIL on control pin E. Figure 14 shows a flow chart of the sector-protect operation. The device is delivered with all sectors unprotected; however, sector-unprotect mode is available to unprotect protected sectors. Figure 16 is a flow chart of the sector-unprotect operation. sector-protect operation The sector-protect mode is activated when VCC = 5.0 V (and operation at TA = 25°C), W = VIH, E = VIL, and address pin A9 and control pin G are forced to VID. The sector-select address pins A14, A15, and A16 are used to select the sector to be protected. Address pins A0–A8, A10–A13, and I/O pins DQ0 – DQ7 must be stable and can be VIL or VIH. Once the addresses are stable, W is pulsed low for 100 µs. The operation begins on the falling edge of W and terminates on the rising edge of W. Figure 15 shows a timing diagram of the sector-protect operation. sector-protect verify Verification of sector protection is activated when VCC = 5.0 V (and operation at TA = 25°C), W = VIH, G = VIL, E = VIL, and address pin A9 = VID. Address pins A0 and A6 are set to VIL, and A1 is set to VIH. The sector-address pins A14, A15, and A16 select the sector to be verified. The other address pins can be VIL or VIH. If the sector selected is protected, the DQs output 01h, and if the sector selected is not protected, the DQs output 00h. |
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