Rainbow Electronics AT45DB041E - Manual (Page 38)

38 AT45DB041E [ADVANCE DATASHEET]
8783B–DFLASH–11/2012
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 t
SWRST
. 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
Register, or the buffer and page size configuration. The PS2, PS1, and ES bits of the Status Register, however, will be
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 00h 00h
CS
SI F0h 00h 00h 00h
Each transition represents eight bits