IS25LE512M-RMLA3:P-TY datasheet(118/189 Pages) ISSI

118 / 189 page

IS25LE512M

IS25WE512M

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

118

Rev. A6

06/16/2025

8.35 READ SFDP OPERATION (RDSFDP, 5Ah)

The Serial Flash Discoverable Parameters (SFDP) standard provides a consistent method of describing the

functions and features of serial Flash devices in a standard set of internal parameter tables. These parameters can

be interrogated by host system software to enable adjustments needed to accommodate divergent features from

multiple vendors. For more details please refer to the JEDEC Standard JESD216 (Serial Flash Discoverable

Parameters).

The sequence of issuing RDSFDP instruction in SPI mode is:

CE# goes low → Send RDSFDP instruction (5Ah) → Send 3 address bytes on SI pin → 8 dummy cycles on SI pin

→ Read SFDP code on SO → End RDSFDP operation by driving CE# high at any time during data out. Refer to

ISSI’s Application note for SFDP table. The data at the addresses that are not specified in SFDP table are

undefined.

RDSFDP Sequence is not supported in QPI mode.

Figure 8.76 RDSFDP (Read SFDP) Sequence

Instruction = 5Ah

Dummy Cycles

CE #

SCK

...

Mode 3

Mode 0

3 Byte Address

Data Out

...

8.36 NO OPERATION (NOP, 00h)

The No Operation command solely cancels a Reset Enable command and has no impact on any other commands.

It is available in both SPI and QPI modes. To execute a NOP, the host drives CE# low, sends the NOP command

cycle (00h), then drives CE# high.

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