GD25LQ128C Datasheet, PDF (50/62 Pages) ELM Electronics – 128M-bit Serial Flash

GD25LQ128CxIGx 1.8V Uniform Sector Dual and Quad Serial Flash
7.36. Read Serial Flash Discoverable Parameter (5AH)
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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. SFDP is a standard of JEDEC Standard No.216.
Figure 38. Read Serial Flash Discoverable Parameter command Sequence Diagram
CS#
SCLK
0 1 2 3 4 5 6 7 8 9 10
28 29 30 31
SI
SO
CS#
SCLK
SI
SO
Command
5AH
High-Z
24-bit address
23 22 21
3210
32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
Dummy Byte
76543210
Data Out1
Data Out2
76543210765
MSB
MSB
Figure 38a. Read Serial Flash Discoverable Parameter command Sequence Diagram (QPI)
CS#
SCLK
IO₀
IO₁
IO₂
IO₃
0 1 2 3 4 5 6 7 8 9 10 11 12 13
Command
5AH _{A23-16 A15-8}
20 16 12 8
A7-0 ^Dummy*
40 4 0 4
IOs switch from
Input to output
04 0 4
21 17 13 9 5 1 5 1 5 1 5 1 5
22 18 14 10 6 2 6 2 6 2 6 2 6
23 19 15 11 7 3 7 3 7 3 7 3 7
Byte1 Byte2
62 - 50
Rev.1.0