W45B012 Datasheet, PDF (4/16 Pages) Winbond – 1M x 1 SERIAL FLASH MEMORY

Preliminary W45B012
Write Protect
The #WP pin provides inadvertent write protection. The #WP pin must be held high for any Erase or
Program operation. The #WP pin is "don't care" for all other operations. In typical use, the #WP pin is
connected to VSS with a standard pull-down resistor. #WP is then driven high whenever an Erase or
Program operation is required. If the #WP pin is tied to VDD with a pull-up resistor, then all operations
may occur and the write protection feature is disabled. The #WP pin has an internal pull-up and could
remain unconnected when not used.
DEVICE OPERATION INSTRUCTION
BUS CYCLE
1
2
3
4
Operation/Type
Command Address ¹ Address Address
Read
Sector-erase ²
FFh A23 − A16 A15 − A8 A7 − A0
20h A23 − A16 A15 − A8
X
Chip-erase
60h
X
X
X
Byte-program
10h A23 − A16 A15 − A8 A7 − A0
Software-status
9Fh
Dout
Read Manufacture ID 90h
X
Read Device ID ³
90h
X
X
A0 = 0
X
A0 = 1
Notes:
1. A23 _− A17 are "Don't Care" for device.
2. A16 _− A12 are used to determine sector address, A11 _− A8 are don't care.
3. With A16 _− A1 = 0, W45B010 Device ID = 98h, is read with A0 = 1.
5
Data
X
Dout
Dout
Din
DAh
98h
6
Dummy
X
X
X
X
7
Data
Dout
DEVICE OPERATION TABLE
OPERATION
SI
SO
#CE¹
#WP
#RESET
Read
X
Dout
Low
X
High
Sector-erase
Chip-erase
X
X
Low
High
High
X
X
Low
High
High
Byte-program
Din
X
Low
High
High
Software-status
Reset2
X
Dout
Low
X
High
X
X
X
X
Low
Read Manufacture ID
X
Dout
Low
X
High
Read Device ID
X
Dout
Low
X
High
Notes:
1. A high to low transition on #CE will be required to start any device operation except for Reset.
2. The #RESET low will return the device to standby and terminate any Erase or Program operation in progress.
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