EN25P20
In the case of Page Program, if the number of byte after the command is less than 4 (at least 1 data
byte), it will be ignored too. In the case of SE, exact 24-bit address is a must, any less or more will
cause the command to be ignored.
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
Read Status
Register
Write Status
Register
Read Data
Fast Read
Page Program
Sector Erase
Bulk Erase
Deep Power-down
Release from Deep
Power-down, and
read Device ID
Release from Deep
Power-down
Manufacturer/
Device ID
Read Identification
Byte 1
Code
06h
04h
05h
01h
03h
0Bh
02h
D8h
C7h
B9h
(4)
dummy
dummy
dummy
(ID7-ID0)
(S7-S0)(1)
S7-S0
A23-A16
A23-A16
A23-A16
A23-A16
A15-A8
A15-A8
A15-A8
A15-A8
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
dummy
(M7-M0)
dummy
(ID15-ID8)
00h
(ID7-ID0)
(M7-M0)
(ID7-ID0)
(5)
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
2012h
(M7-M0)
(ID15-ID0)
(ID7-ID0)
11h
11h
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. D, Issue Date: 2007/05/07
EON [ EON SILICON SOLUTION INC. ]
