23A1024/23LC1024

DS20005142C-page 16

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4.2

Quad Interface Mode

In addition to the Serial Dual interface (SDI) mode of

operation

Serial

Quad

Interface

(SQI)

is

also

supported. In this mode the HOLD functionality is not

available. To enter SQI mode the EQIO command must

be clocked in (Figure 4-4).

FIGURE 4-4:

ENTER SQI MODE (EQIO) FROM SPI MODE

FIGURE 4-5:

BYTE READ MODE SQI

SCK

0

2

34

56

7

1

SI

High-Impedance

SO

CS

00

01

11

0

0

Note 1: Page and Sequential mode is similar in that additional bytes can be clocked out before CS is

brought high.

2: The first byte read after the address will be a dummy byte.

CS

SCK

0

2345

67

1

8

9

1

0

40

20

16

12

8

SIO0

1

0

51

21

17

13

9

0

0

62

22

18

14

10

0

0

73

23

19

15

11

SIO1

SIO2

SIO3

Instruction

24-Bit Address

Dummy Byte

10

11

4

0

5

1

6

2

7

3

Data Out