EN25F20
All attempts to access the memory array during a Write Status Register cycle, Program cycle or Erase
cycle are ignored, and the internal Write Status Register cycle, Program cycle or Erase cycle continues
unaffected.
Table 4. Instruction Set
Instruction Name
Write Enable
Write Disable / Exit
OTP mode
Read Status
Register
Write Status
Register
Read Data
Fast Read
Page Program
Sector Erase
Block Erase
Chip Erase
Deep Power-down
Release from Deep
Power-down, and
read Device ID
Release from Deep
Power-down
Manufacturer/
Device ID
Read Identification
Enter OTP mode
Byte 1
Code
06h
04h
05h
01h
03h
0Bh
02h
20h
D8h/ 52h
C7h/ 60h
B9h
(4)
dummy
dummy
dummy
(ID7-ID0)
(S7-S0)(1)
S7-S0
A23-A16
A23-A16
A23-A16
A23-A16
A23-A16
A15-A8
A15-A8
A15-A8
A15-A8
A15-A8
A7-A0
A7-A0
A7-A0
A7-A0
A7-A0
(D7-D0)
dummy
D7-D0
(Next byte)
(D7-D0)
(Next byte)
continuous
(Next Byte)
continuous
continuous
continuous
(2)
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
n-Bytes
ABh
90h
9Fh
3Ah
dummy
(M7-M0)
dummy
(ID15-ID8)
00h(5)
(ID7-ID0)
(M7-M0)
(ID7-ID0)
Notes:
1. Data bytes are shifted with Most Significant Bit first. Byte fields with data in parenthesis “( )” indicate data being read from
the device on the DO pin.
2. The Status Register contents will repeat continuously until CS# terminate the instruction.
3. All sectors may use any address within the sector.
4. The Device ID will repeat continuously until CS# terminate the instruction.
5. The Manufacturer ID and Device ID bytes will repeat continuously until CS# terminate the instruction.
00h on Byte 4 starts with MID and alternate with DID, 01h on Byte 4 starts with DID and alternate with MID.
Table 5. Manufacturer and Device Identification
OP Code
ABh
90h
9Fh
1Ch
1Ch
3112h
(M7-M0)
(ID15-ID0)
(ID7-ID0)
11h
11h
Write Enable (WREN) (06h)
The Write Enable (WREN) instruction (Figure 5) sets the Write Enable Latch (WEL) bit. The Write Enable
Latch (WEL) bit must be set prior to every Page Program (PP), Sector Erase (SE), Block Erase (BE), Chip
Erase (CE) and Write Status Register (WRSR) instruction.
The Write Enable (WREN) instruction is entered by driving Chip Select (CS#) Low, sending the instruction
code, and then driving Chip Select (CS#) High.
This Data Sheet may be revised by subsequent versions
or modifications due to changes in technical specifications.
8
©2004 Eon Silicon Solution, Inc., www.essi.com.tw
Rev. B, Issue Date: 2007/05/15
EON [ EON SILICON SOLUTION INC. ]
