AT25QL641 datasheet(53/77 Pages) DIALOG

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AT25QL641

DS-25QL641–130E–10/2018

Figure 7-57. Enable Reset and Reset Instruction (QPI Mode)

7.36

Read Serial Flash Discovery Parameter (5Ah)

The Read Serial Flash Discovery Parameter (SFDP) instruction allows reading the Serial Flash Discovery Parameter

area (SFDP). This SFDP area is composed of 2048 read-only bytes containing operating characteristics and vendor

specific information. The SFDP area is factory programmed. If the SFDP area is blank, the device is shipped with all the

SFDP bytes at FFh. If only a portion of the SFDP area is written to, the portion not used is shipped with bytes in the

erased state (FFh).

The instruction sequence for the read SFDP has the same structure as that of a ‘Fast Read’ instruction. First, the device

is selected by driving Chip Select (CS) low. Next, the 8-bit instruction code (5Ah) and the 24-bit address are shifted in,

followed by 8 dummy clock cycles. The bytes of SFDP content are shifted out on the Serial Data Output (SO) starting

from the specified address. Each bit is shifted out during the falling edge of Serial Clock (SCK). The instruction sequence

is shown here. The ‘Read SFDP’ instruction is terminated by driving Chip Select (CS) high at any time during data

output.

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