EN25F40A Datasheet, PDF (15/62 Pages) Eon Silicon Solution Inc. – 4 Megabit Serial Flash Memory with 4Kbyte Uniform Sector

EN25F40A
Reset-Enable (RSTEN) (66h) and Reset (RST) (99h)
The Reset operation is used as a system (software) reset that puts the device in normal operating
Ready mode. This operation consists of two commands: Reset-Enable (RSTEN) and Reset (RST).
To reset the EN25F40A the host drives CS# low, sends the Reset-Enable command (66h), and drives
CS# high. Next, the host drives CS# low again, sends the Reset command (99h), and drives CS# high.
The Reset operation requires the Reset-Enable command followed by the Reset command. Any
command other than the Reset command after the Reset-Enable command will disable the Reset-
Enable.
A successful command execution will reset the Status register and the Information register to data =
00h, see Figure 7 for SPI Mode and Figure 7.1 for QPI Mode. A device reset during an active Program
or Erase operation aborts the operation, which can cause the data of the targeted address range to be
corrupted or lost. Depending on the prior operation, the reset timing may vary. Recovery from a Write
operation requires more software latency time (t_SR) than recovery from other operations. Please Figure
7.2.
Figure 7. Reset-Enable and Reset Sequence Diagram
Figure 7.1 Reset-Enable and Reset Sequence Diagram in QPI Mode
Figure 7.2 Software Reset Recovery
This Data Sheet may be revised by subsequent versions
15
or modifications due to changes in technical specifications.
©2013 Eon Silicon Solution, Inc.,
Rev. A, Issue Date: 2013/11/18
www.eonssi.com