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AT25QL641 Datasheet(PDF) 30 Page - Renesas Technology Corp

Part # AT25QL641
Description  SPI Serial Flash Memory with Dual I/O, Quad I/O, QPI Support
PDF  80 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

AT25QL641 Datasheet(HTML) 30 Page - Renesas Technology Corp

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DS-AT25QL641-130 Rev. G
Page 30
Sep 14, 2022
© 2022 Renesas Electronics
AT25QL641 Datasheet
8.11 Fast Read Dual Output (3Bh)
By using two pins (I/O0 and I/O1, instead of just I/O0), The Fast Read Dual Output command allows data to be
transferred from the AT25QL641 at twice the rate of standard SPI devices. The Fast Read Dual Output command
is ideal for quickly downloading code from Flash to RAM upon power-up or for application that cache code-
segments to RAM for execution.
The Fast Read Dual Output command can operate at the highest possible frequency of FR (see Table 26, AC
Electrical Characteristics). After the 24-bit address, this is accomplished by adding eight dummy clocks as shown
in Figure 18. The dummy clocks allow the internal circuits additional time for setting up the initial address. During
the dummy clocks, the data value on the SO pin is a don’t care. However, the I/O0 pin should be high-impedance
prior to the falling edge of the first data out clock.
Figure 18. Fast Read Dual Output Command (SPI Mode)
SCK
CS
SI
SO
1
0
234
6
579
810
28
23
22
21
3
2
1
0
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
High-Impedance
24-Bit Address
Command
3Bh
SCK
CS
SI
SO
High-Impedance
Dummy Clocks
Data Byte 1
Data Byte 2
75
3
1
64
2
0
75
3
1
64
2
0



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