W25B40 Datasheet, PDF (13/36 Pages) Winbond – 4M-BIT SERIAL FLASH MEMORY WITH BOOT AND PARAMETER SECTORS

W25B40/W25B40A
8.2.1 Manufacturer and Device Identification
MANUFACTURER ID
Winbond Serial Flash
(M7-M0)
EFH
Device ID
W25B40 / W25B40A (Bottom Boot)
W25B40 / W25B40A (Top Boot)
(ID7-ID0)
32h
42h
8.2.2 Instruction Set ⁽¹⁾
INSTRUCTION
NAME
Write Enable
Write Disable
Read Status
Register
Write Status
Register
Read Data
BYTE 1
CODE
06h
04h
05h
BYTE 2
(S7–S0)⁽¹⁾
01h
S7–S0
03h
A23–A16
Fast Read
0Bh
A23–A16
BYTE 3
A15–A8
A15–A8
Page Program 02h
Sector Erase
D8h
Chip Erase
C7h
Power-down
B9h
Release Power-
down / Device ID
ABh
Manufacturer/
Device ID
90h
A23–A16
A23–A16
A15–A8
A15–A8
dummy
dummy
dummy
dummy
BYTE 4
A7–A0
A7–A0
A7–A0
A7–A0⁽⁵⁾
dummy
00h
BYTE 5 BYTE 6 N-BYTES
(2)
(D7–D0)
dummy
(D7–D0)
(Next byte)
(D7–D0)
(Next byte)
continuous
(Next Byte)
continuous
up to 256
bytes
(ID7-ID0)
(3)
(M7-M0) (ID7-ID0) ⁽⁴⁾
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 terminates the instruction.
3. The Device ID will repeat continuously until /CS terminates the instruction.
4. The Manufacturer ID and Device ID bytes will repeat continuously until /CS terminates the instruction.
5. The W25B40 Bottom Boot version must use the last page address for sectors 2, 3, and 4 ( 003Fxx, 007Fxx and 00FFxx hex
respectively). The W25B40 Top Boot version must use the first page address for sectors 7, 8 and 9 ( 0700xx, 0780xx and
07C0xx hex respectively). All other sectors may use any page address within the sector. The W25B40A may use any page
address within the sector for sector erase.
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Publication Release Date: January 6, 2006
Revision M