W25M02GV
7.2.4
ECC Enable Bit (ECC-E) – Volatile Writable
W25M02GV has a built-in ECC algorithm that can be used to preserve the data integrity. Internal ECC
calculation is done during page programming, and the result is stored in the extra 64-Byte area for each
page. During the data read operation, ECC engine will verify the data values according to the previously
stored ECC information and to make necessary corrections if needed. The verification and correction
status is indicated by the ECC Status Bits. ECC function is enabled by default when power on (ECC-E=1),
and it will not be reset to 0 by the Device Reset command.
7.2.5 Buffer Read / Continuous Read Mode Bit (BUF) – Volatile Writable
Each stacked W25N01GV die provides two different modes for read operations, Buffer Read Mode
(BUF=1) and Continuous Read Mode (BUF=0). Prior to any Read operation, a Page Data Read command
is needed to initiate the data transfer from a specified page in the memory array to the Data Buffer. By
default, after power up, the data in page 0 will be automatically loaded into the Data Buffer and the device
is ready to accept any read commands.
The Buffer Read Mode (BUF=1) requires a Column Address to start outputting the existing data inside the
Data Buffer, and once it reaches the end of the data buffer (Byte 2,111), DO (IO1) pin will become high-Z
state.
The Continuous Read Mode (BUF=0) doesn’t require the starting Column Address. The device will always
start output the data from the first column (Byte 0) of the Data buffer, and once the end of the data buffer
(Byte 2,048) is reached, the data output will continue through the next memory page. With Continuous
Read Mode, it is possible to read out the entire memory array using a single read command. Please refer
to respective command descriptions for the dummy cycle requirements for each read commands under
different read modes.
For W25M02GVxxIG part number, the default value of BUF bit after power up is 1 for both stacked dies.
BUF bit can be written to 0 individually in the Status Register-2 to perform the Continuous Read operation.
For W25M02GVxxIT part number, the default value of BUF bit after power up is 0 for both stacked dies.
BUF bit can be written to 1 individually in the Status Register-2 to perform the Buffer Read operation.
Read Mode
(Starting from Buffer)
BUF
ECC-E
ECC Status
Data Output Structure
1
1
0
0
0
1
0
1
Buffer Read
N/A
Page based
N/A
2,048 + 64
2,048 + 64
2,048
Buffer Read
Continuous Read
Continuous Read
Operation based
2,048
Publication Release Date: July 1, 2015
Preliminary - Revision B
- 18 -
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