IS25WP064A-RBLE datasheet(45/111 Pages) ISSI

45 / 111 page

IS25WP064A/032A

Integrated Silicon Solution, Inc.- www.issi.com

Rev. 00D

03/01/2016

8.9 QUAD INPUT PAGE PROGRAM OPERATION (PPQ, 32h/38h)

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 (TBS, 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 instruc

tion. 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 8.13 Quad Input Page Program operation

Instruction = 32h/38h

CE #

SCK

3-byte Address

High Impedance

...

Mode 3

Mode 0

IO0

IO1

Data In 2

IO2

IO3

...

Data In 1

...

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