AT45DB641E datasheet(39/72 Pages) DIALOG

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AT45DB641E

DS-45DB641E-

027L–DFLASH–8/2021

13.

Software Reset

In some applications, it may be necessary to prematurely terminate a program or erase cycle early rather than wait the

hundreds of microseconds or milliseconds necessary for the program or erase operation to complete normally. The

Software Reset command allows a program or erase operation in progress to be ended abruptly and returns the device

to an idle state.

To perform a Software Reset, the CS pin must be asserted and a 4-byte command sequence of F0h, 00h, 00h, and 00h

must be clocked into the device. Any additional data clocked into the device after the last byte will be ignored. When the

CS pin is deasserted, the program or erase operation currently in progress will be terminated within a time tSWRST. Since

the program or erase operation may not complete before the device is reset, the contents of the page being programmed

or erased cannot be guaranteed to be valid.

The Software Reset command has no effect on the states of the Sector Protection Register, the Sector Lockdown

reset back to their default states. If a Software Reset operation is performed while a sector is erase suspended, the

suspend operation will abort and the contents of the page or block being erased in the suspended sector will be left in an

undefined state. If a Software Reset is performed while a sector is program suspended, the suspend operation will abort

and the contents of the page that was being programmed and subsequently suspended will be undefined. The remaining

pages in the sector will retain their previous contents.

The complete 4-byte opcode must be clocked into the device before the CS pin is deasserted, and the CS pin must be

deasserted on a byte boundary (multiples of eight bits); otherwise, no reset operation will be performed.

Table 13-1. Software Reset

Figure 13-1. Software Reset

Command

Byte 1

Byte 2

Byte 3

Byte 4

Software Reset

F0h

00h

F0h

00h

Each transition represents eight bits

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