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TMS28F020-10C5FML Datasheet(PDF) 7 Page - Texas Instruments |
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TMS28F020-10C5FML Datasheet(HTML) 7 Page - Texas Instruments |
7 / 21 page TMS28F020 262144 BY 8 BIT FLASH MEMORY SMJS020C − OCTOBER 1994 − REVISED JANUARY 1998 7 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 command definitions read command Memory contents can be accessed while VPP is high or low. When VPP is high, writing 00h into the command register invokes the read operation. When the device is powered up, the default contents of the command register are 00h and the read operation is enabled. The read operation remains enabled until a different valid command is written to the command register. algorithm-selection-mode command The algorithm-selection mode is activated by writing 90h into the command register. The manufacturer-equivalent code (89h) is identified by the value read from address location 00000h, and the device-equivalent code (BDh) is identified by the value read from address location 00001h. set-up-erase/erase commands The erase algorithm begins with E = VIL, W = VIL, G = VIH, VPP = VPPH, and VCC = 5 V. To enter the erase mode, write the set-up-erase command, 20h, into the command register. Writing a second erase command, 20h, into the command register invokes the erase operation. The erase operation begins on the rising edge of W and ends on the rising edge of the next W. The erase operation requires 10 ms to complete before the erase-verify command, A0h, can be loaded. Maximum erase timing is controlled by the internal stop timer. When the stop timer terminates the erase operation, the device enters an inactive state and remains inactive until a command is received. erase-verify command All bytes must be verified following an erase operation. After the erase operation is complete, an erased byte can be verified by writing the erase-verify command, A0h, into the command register. This command causes the device to exit the erase mode on the rising edge of W. The address of the byte to be verified is latched on the falling edge of W. The erase-verify operation remains enabled until a command is written to the command register. To determine whether or not all the bytes have been erased, the TMS28F020 applies a margin voltage to each byte. If FFh is read from the byte, all bits in the designated byte have been erased. The erase-verify operation continues until all of the bytes have been verified. If FFh is not read from a byte, an additional erase operation must be executed. Figure 1 shows the combination of commands and bus operations for electrically erasing the TMS28F020. set-up-program/program commands The programming algorithm begins with E = VIL, W = VIL, G = VIH, VPP = VPPH, and VCC = 5 V. To enter the programming mode, write the set-up-program command, 40h, into the command register. The programming operation is invoked by the next write-enable pulse. Addresses are latched internally on the falling edge of W, and data is latched internally on the rising edge of W. The programming operation begins on the rising edge of W and ends on the rising edge of the next W pulse. The program operation requires 10 µs for completion before the program-verify command, C0h, can be loaded. Maximum program timing is controlled by the internal stop timer. When the stop timer terminates the program operation, the device enters an inactive state and remains inactive until a command is received. |
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