EN25D16 Datasheet, PDF (18/37 Pages) Eon Silicon Solution Inc. – 16 Megabit Serial Flash Memory

EN25D16
Figure 12. Page Program Instruction Sequence Diagram
Sector Erase (SE) (20h)
The Sector Erase (SE) instruction sets to 1 (FFh) all bits inside the chosen sector. Before it can be
accepted, a Write Enable (WREN) instruction must previously have been executed. After the Write
Enable (WREN) instruction has been decoded, the device sets the Write Enable Latch (WEL).
The Sector Erase (SE) instruction is entered by driving Chip Select (CS#) Low, followed by the in-
struction code, and three address bytes on Serial Data Input (DI). Any address inside the Sector
(see Table 2) is a valid address for the Sector Erase (SE) instruction. Chip Select (CS#) must be
driven Low for the entire duration of the sequence.
The instruction sequence is shown in Figure 13. Chip Select (CS#) must be driven High after the
eighth bit of the last address byte has been latched in, otherwise the Sector Erase (SE) instruction is
not executed. As soon as Chip Select (CS#) is driven High, the self-timed Sector Erase cycle
(whose duration is tSE) is initiated. While the Sector Erase cycle is in progress, the Status Register
may be read to check the value of the Write In Progress (WIP) bit. The Write In Progress (WIP) bit is
1 during the self-timed Sector Erase cycle, and is 0 when it is completed. At some unspecified time
before the cycle is completed, the Write Enable Latch (WEL) bit is reset.
A Sector Erase (SE) instruction applied to a sector which is protected by the Block Protect (BP2,
BP1, BP0) bits (see Table 3) is not executed.
This Data Sheet may be revised by subsequent versions ₁₈ ©2004 Eon Silicon Solution, Inc., www.essi.com.tw
or modifications due to changes in technical specifications.
Rev. B, Issue Date: 2008/06/23