IS25LP064A-RGLA1 datasheet(64/99 Pages) ISSI

64 / 99 page

IS25LP064A/032A

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

Rev. A

11/06/2015

8.29 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 JESD216A (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 1 dummy byte 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 8.49 RDSFDP (Read SFDP) Sequence

Instruction = 5Ah

Dummy Byte

CE #

SCK

...

Mode 3

Mode 0

3 Byte Address

Data Out

...

8.30 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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