IS25WQ020 Datasheet, PDF (31/65 Pages) Integrated Silicon Solution, Inc – 1.8V QUAD SERIAL FLASH MEMORY WITH MULTI-I/O SPI

PRELIMINARY INFORMATION
IS25WQ040/020
8.9 QUAD INPUT PAGE PROGRAM OPERATION (PPQ, 32h)
The Quad Input Page Program instruction allows up to 256 bytes data to be programmed into memory in a
single operation with four pins (IO0, IO1, IO2 and IO3). The destination of the memory to be programmed must
be outside the protected memory area set by the Block Protection (BP3, BP2, BP1, BP0) bits. A Quad Input
Page Program instruction which attempts to program into a page that is write-protected will be ignored. Before
the execution of Quad Input Page Program instruction, the QE bit in the Status Register must be set to “1” and
the Write Enable Latch (WEL) must be enabled through a Write Enable (WREN) instruction.
The Quad Input Page Program instruction code, three address bytes and program data (1 to 256 bytes) are
input via the four pins (IO0, IO1, IO2 and IO3). Program operation will start immediately after the CE# is brought
high, otherwise the Quad Input Page Program instruction will not be executed. The internal control logic
automatically handles the programming voltages and timing. During a program operation, all instructions will be
ignored except the RDSR instruction. The progress or completion of the program operation can be determined
by reading the WIP bit in Status Register via a RDSR instruction. If the WIP bit is “1”, the program operation is
still in progress. If WIP bit is “0”, the program operation has completed.
If more than 256 bytes data are sent to a device, the address counter rolls over within the same page, the
previously latched data are discarded, and the last 256 bytes data are kept to be programmed into the page.
The starting byte can be anywhere within the page. When the end of the page is reached, the address will wrap
around to the beginning of the same page. If the data to be programmed are less than a full page, the data of all
other bytes on the same page will remain unchanged.
Note: A program operation can alter “1”s into “0”s, but an erase operation is required to change “0”s back to “1”s.
A byte cannot be reprogrammed without first erasing the whole sector or block.
Figure 8.9 Quad Input Page Program operation
CE#
SCK
IO0
IO1
0 1 2 3 4 5 6 7 8 9 ... 31 32 33 34 35
Mode 3
Mode 0
Instruction = 32h
High Impedance
3-byte Address
Data In 1 Data In 2
23 22 ... 0 4 0 4 0 ^...
5 1 5 1 ...
IO2
6 2 6 2 ...
IO3
7 3 7 3 ...
Integrated Silicon Solution, Inc.- www.issi.com
Rev. 0A
31
12/05/2014