AT45DB321E datasheet(49/80 Pages) RENESAS

49 / 80 page

DS-AT45DB321E-8784 Rev. N

Page 49

9/1/23

AT45DB321E Datasheet

13. Software Reset

In some applications, it can 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 four-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 are

ignored. When the CS pin is deasserted, the program or erase operation currently in progress is terminated within

a time tSWRST. Since the program or erase operation does not always 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

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

suspended, the suspend operation aborts and the contents of the page or block being erased in the suspended

sector is left in an undefined state. If a Software Reset is performed while a sector is program suspended, the

suspend operation aborts and the contents of the page that was being programmed and subsequently suspended

are undefined. The remaining pages in the sector retain their previous contents.

The complete four-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 is performed.

Table 26. Software Reset

Figure 22. 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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