GD25LQ256C Datasheet, PDF (54/68 Pages) ELM Electronics – 256M-bit Serial Flash

GD25LQ256CWIGx 1.8V Uniform Sector Dual and Quad Serial Flash
7.36. Burst Read with Wrap for Higher 128Mb (8DH)
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The “Burst Read with Wrap for Higher 128Mb (8DH)” command provides an alternative way to perform the
read operation with “Wrap Around” in QPI mode. This command is similar to the “Fast Read (0BH)” command
in QPI mode, except the addressing of the read operation will “Wrap Around” to the beginning boundary of the
“Wrap Around” once the ending boundary is reached. The “Wrap Length” and the number of dummy clocks can
be configured by the “Set Read Parameters (C0H)” command. The “Burst Read with Wrap for higher 128Mb
(8DH)” command will read out the memory content from 1000000H to 1FFFFFFH.
The “Burst Read with Wrap for Higher 128Mb (8DH)” command sequence: CS# goes low → sending The “Burst
Read with Wrap for Higher 128Mb (8DH)” command → sending 3-byte address (A23-A0, The A24 default
value is 1) → sending dummy byte → then data out.
Figure 38. Burst Read with Wrap for Higher 128Mb command Sequence Diagram
CS#
SCLK
IO₀
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
Command
8DH
20 16 12 8 4 0
IOs switch from
Input to output
4 04 0 4
IO₁
21 17 13 9 5 1
5 15 1 5
IO₂
22 18 14 10 6 2
6 26 2 6
IO₃
23 19 15 11 7 3
7 37 3 7
A23-16
A15-8
A7-0
Dummy*
Byte1
Byte2
Byte3
*"Set Read Parameters" Command (C0H)
can set the number of dummy clocks
68 - 54
Rev.1.0