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P25Q40H Datasheet(PDF) 63 Page - Puya Semiconductor Co., Ltd.

Part # P25Q40H
Description  Ultra Low Power, 4M/2M/1M/512K-bit Serial Multi I/O Flash Memory
PDF  76 Pages
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Manufacturer  PUYA [Puya Semiconductor Co., Ltd.]
Direct Link  http://www.puyasemi.com/index_en.html
Logo PUYA - Puya Semiconductor Co., Ltd.

P25Q40H Datasheet(HTML) 63 Page - Puya Semiconductor Co., Ltd.

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P25Q40H/20H/10H/05H Datasheet
Puya Semiconductor
Page 63 of 76
10.40
Read SFDP Mode (RDSFDP)
The Serial Flash Discoverable Parameter (SFDP) standard provides a consistent method of describing the
functional and feature capabilities of serial flash devices in a standard set of internal parameter tables. These
parameter tables can be interrogated by host system software to enable adjustments needed to
accommodate divergent features from multiple vendors. The concept is similar to the one found in the
Introduction of JEDEC Standard, JESD68 on CFI.
The sequence of issuing RDSFDP instruction is same as FAST_READ: CS# 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→ to end RDSFDP operation can use CS# to high at any time during data out.
SFDP is a JEDEC Standard, JESD216B.
Figure 10-41 Read Serial Flash Discoverable Parameter (RDSFDP) Sequence
Command
0
1
2
3
4
5
6
7
5AH
CS#
SCLK
SI
SO
High - Z
8
9 10
28 29 30 31
3
2
1
0
23 22
21
24-bit address
MSB
6
5
4
3
2
1
0
Data Out1
7
6
5
4
3
2
1
0
7
6
5
7
Data Out2
CS#
SCLK
SI
SO
MSB
DummyByte
32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47


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