IS25LP256D-RGLA3 datasheet(112/174 Pages) ISSI

112 / 174 page

IS25LP256D

IS25WP256D

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

112

Rev A6

04/15/2019

8.41 INFORMATION ROW READ OPERATION (IRRD, 68h)

The IRRD instruction is used to read data from Information Row.

The IRRD instruction code is followed by three address bytes (A23 - A0) and dummy cycles (configurable, default

is 8 clocks), transmitted via the SI line, with each bit latched-in during the rising edge of SCK. Then the first data

byte addressed is shifted out on the SO line, with each bit shifted out at a maximum frequency fCT, during the falling

edge of SCK.

The address is automatically incremented by one after each byte of data is shifted out. Once the address reaches

the last address of each 256 byte Information Row, the next address will not be valid and the data of the address

will be garbage data. It is recommended to repeat four times IRRD operation that reads 256 byte with a valid starting

address of each Information Row in order to read all data in the 4 x 256 byte Information Row array. The IRRD

instruction is terminated by driving CE# high (VIH).

If an IRRD instruction is issued while an Erase, Program or Write cycle is in process (WIP=1) the instruction is

ignored and will not have any effects on the current cycle

The sequence of IRRD instruction is same as Fast Read except for the instruction code. IRRD QPI sequence is

same as Fast Read QPI except for the instruction code. Refer to the Fast Read QPI operation.

The maximum operating clock frequency for the IRRD operation is the same with Fast Read Operation.

Figure 8.81 IRRD (Information Row Read) Sequence

Instruction = 68h

Dummy Cycles

CE #

SCK

...

Mode 3

Mode 0

3 Byte Address

Data Out

...

Note: Dummy cycles depends on Read Parameter setting. Detailed information in Table 6.11 Read Dummy Cycles.

IS25LP256D-RGLA3 Datasheet(PDF) 112 Page - Integrated Silicon Solution, Inc