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23A1024

1Mbit SPI Serial SRAM with SDI and SQI Interface

Microchip Technology 

23A1024/23LC1024

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

CS

SCK

01234567

FIGURE 4-5:

CS

SCK

SIO0

SI

00111000

High-Impedance

SO

BYTE READ MODE SQI

0 1 2 3 4 5 6 7 8 9 10 11

0 1 20 16 12 8 4 0

40

SIO1

0 1 21 17 13 9 5 1

51

SIO2

0 0 22 18 14 10 6 2

62

SIO3

0 0 23 19 15 11 7

Instruction

24-Bit Address

3

73

Dummy Byte Data Out

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.

DS20005142C-page 16

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