LE25S161 datasheet(36/54 Pages) ONSEMI

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LE25S161

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10-17. Read SFDP (RSFDP)

The Read SFDP (Serial Flash Discoverable Parameter) is an operation that reads the parameter about device

configurations, available commands and other features. The SFDP parameters are stored in internal parameter tables.

These parameter tables can be interrogated by host system software to enable adjustments needed to accommodate

divergent features from multiple vendors. SFDP is a standard of JEDEC. JESD216. Rev 1.0.

"Table 8. SFDP Header" shows SFDP Header.

"Table 9. SFDP Parameter Table" shows SFDP Parameter Table.

"Figure 23. Read SFDP (RSFDP)" shows the timing waveforms.

The sequence of RSFDP operation :

CS goes to low  input RSFDP command (5Ah)  3 Byte address (A23-A0) input on SI

 1 byte dummy cycle  the corresponding parameter out on SO

 continuous parameter out (n-byte) 

 completed by CS=high

* A10 to A0 are valid address

* The parameter output starts from the falling edge of SCK(39th clock)

The Address is latched on rising edge of SCK. It is necessary to add 1 dummy byte cycle after address is latched, and the

corresponding parameter is shifted out on SO by the falling edge of SCK. The address is automatically incremented to the

next higher address after each byte parameter is shifted out. By setting CS to high, the device is deselected, and Read

SFDP cycle is completed. While the device is deselected, the output pin SO is in a high-impedance state.

Add

(A7-A0)

Add

(A15-A8)

Add

(A23-A16)

Byte 3

Byte 2

Byte 1

High Impedance

Param3

Param2

Param1

SCK

5Ah

MSB

31 32

39 40

47 48

Mode3

Mode0

8CLK

MSB

Figure 23. Read SFDP (RSFDP)

LE25S161 Datasheet(PDF) 36 Page - ON Semiconductor

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