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AT25SL321 Datasheet(PDF) 29 Page - Renesas Technology Corp

Part # AT25SL321
Description  32-Mbit, 1.7 V Minimum SPI Serial Flash Memory with Dual I/O, Quad I/O, and QPI Support
PDF  82 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

AT25SL321 Datasheet(HTML) 29 Page - Renesas Technology Corp

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DS-AT25SL321-112 Rev. J
Page 29
Nov 1, 2022
© 2022 Renesas Electronics
AT25SL321 Datasheet
8.11 Fast Read Dual Output (3Bh)
By using two pins (IO0 and IO1, instead of just IO0), the Fast Read Dual Output command allows data to be
transferred from the AT25SL321 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 the RAM for execution.
The Fast Read Dual Output command can operate at the highest possible frequency of FR (see Section 9.8, AC
Electrical Characteristics). After the 24-bit address, eight dummy clocks are inserted to allow the internal circuits
time set up the initial address. During the dummy clocks, the data value on the SO pin is a don’t care. However,
the IO0 pin is going to be high-impedance prior to the falling edge of the first data out clock. This is shown in
Figure 17.
Figure 17. 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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