EN25F40A Datasheet, PDF (34/62 Pages) Eon Silicon Solution Inc. – 4 Megabit Serial Flash Memory with 4Kbyte Uniform Sector

EN25F40A
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 (BP3, BP2,
BP1, BP0) bits (see Table 3) is not executed.
The instruction sequence is shown in Figure 22.1 while using the Enable Quad Peripheral Interface mode
(EQPI) (38h) command.
Figure 20. Sector Erase Instruction Sequence Diagram
32KB Half Block Erase (HBE) (52h)
The Half Block Erase (HBE) instruction sets to 1 (FFh) all bits inside the chosen block. 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 Half Block Erase (HBE) 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 Block (see
Table 2) is a valid address for the Half Block Erase (HBE) instruction. Chip Select (CS#) must be driven
Low for the entire duration of the sequence.
The instruction sequence is shown in Figure 21. Chip Select (CS#) must be driven High after the eighth
bit of the last address byte has been latched in, otherwise the Half Block Erase (HBE) instruction is not
executed. As soon as Chip Select (CS#) is driven High, the self-timed Half Block Erase cycle (whose
duration is tHBE) is initiated. While the Block 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 Half Block 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 Half Block Erase (HBE) instruction applied to a block which is protected by the Block Protect (BP3,
BP2, BP1, BP0) bits (see Table 3) is not executed.
The instruction sequence is shown in Figure 22.1 while using the Enable Quad Peripheral Interface mode
(EQPI) (38h) command.
This Data Sheet may be revised by subsequent versions
34
or modifications due to changes in technical specifications.
©2013 Eon Silicon Solution, Inc.,
Rev. A, Issue Date: 2013/11/18
www.eonssi.com