AT25FF321A datasheet(14/112 Pages) RENESAS

14 / 112 page

DS-AT25FF321A-181 Rev. R

Page 14

2024-12-20

AT25FF321A Datasheet

4.2.4

Command, Address, and Data (1-1-1)

Figure 7 through Figure 9 show a command, address, and data transfer. In this type of transfer the command and

address are followed by one or more data types, depending on the command type.

Note that this type of transfer may contain one or more dummy bytes between the end of the address and the

beginning of the data output depending on the type of command. See Table 18 for more information.

The 1-1-1 transfer type for a read operation without dummy bytes is shown in Figure 7.

Figure 7. SPI Transfer — Command, Address, and Data — Read Operation with No Dummy Bytes

The 1-1-1 transfer type for a read operation with dummy bytes is shown in Figure 8. Note that eight dummy clocks

are shown in the figure below for illustration purposes only. More than eight clocks may be required depending on

the type of operation and operating frequency.

Figure 8. SPI Transfer — Command, Address, and Data — Read Operation with Dummy Bytes

The 1-1-1 transfer type for a write operation is shown in Figure 9.

Figure 9. SPI Transfer — Command, Address, and Data — Write Operation

SCK

MSB

CCCCCCCC

410 11

812

37 38

31 32

29 30

39 40

COMMAND

AAAA

AAA

MSB

DDDDDDDD

ADDRESS BITS A23-A0

DATA OUT 1

HIGH-IMPEDANCE

Mode 3

Mode 0

SCK

MSB

CCCCCCCC

410 11

812

42 43

37 38

31 32

29 30

47 48

COMMAND

AAAA

AAA

MSB

XXXXXXXX

MSB

DDDDDDDD

ADDRESS BITS A23-A0

DUMMY

DATA OUT 1

HIGH-IMPEDANCE

Mode 3

Mode 0

SCK

MSB

CCCCCCCC

410 11

812

37 38

31 32

29 30

COMMAND

HIGH-IMPEDANCE

AAAA

AAA

MSB

DDDDDDDD

ADDRESS BITS A23-A0

DATA IN

Mode 3

Mode 0

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