IS25LP064A-RHLA1 datasheet(68/99 Pages) ISSI

68 / 99 page

IS25LP064A/032A

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

Rev. A

11/06/2015

8.34 INFORMATION ROW PROGRAM OPERATION (IRP, 62h)

The Information Row Program (IRP) instruction allows up to 256 bytes data to be programmed into the memory

in a single operation. Before the execution of IRP instruction, the Write Enable Latch (WEL) must be enabled

through a Write Enable (WREN) instruction.

The IRP instruction code, three address bytes and program data (1 to 256 bytes) should be sequentially input.

Three address bytes has to be input as specified in the Table 8.6 Information Row Valid Address Range.

Program operation will start once the CE# goes high, otherwise the IRP 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 corresponding Information Row array which is one

of IR0~3.

Figure 8.53 IRP (Information Row Program) Sequence

Instruction = 62h

CE #

SCK

3-byte Address

High Impedance

...

Data In 1

Data In 256

...

Mode 3

Mode 0

...

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