IS25LP256D-RHLA3-TR datasheet(112/179 Pages) ISSI

112 / 179 page

IS25LP256D

IS25WP256D

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

112

Rev A15

08/05/2024

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 is same as FAST_READ: CE# goes low → Send RDSFDP instruction

(5Ah) → Send 3 address bytes on SI pin → Send dummy cycles (configurable, default is 8 clocks) 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.

The sequence of RDSFDP instruction is same as FAST READ except for the instruction code. RDSFDP QPI

sequence is also same as FAST READ QPI except for the instruction code. Refer to the FAST READ QPI operation.

Figure 8.76 RDSFDP (Read SFDP) Sequence

Instruction = 5Ah

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.

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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