23A1024 Просмотр технического описания (PDF) - Microchip Technology

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23A1024

1Mbit SPI Serial SRAM with SDI and SQI Interface

Microchip Technology 

23A1024/23LC1024

TABLE 2-1: INSTRUCTION SET

Instruction Name Instruction Format

READ

WRITE

EDIO

EQIO

RSTIO

RDMR

WRMR

0000 0011

0000 0010

0011 1011

0011 1000

1111 1111

0000 0101

0000 0001

Hex

Code

0x03

0x02

0x3B

0x38

0xFF

0x05

0x01

Description

Read data from memory array beginning at selected address

Write data to memory array beginning at selected address

Enter Dual I/O access (enter SDI bus mode)

Enter Quad I/O access (enter SQI bus mode)

Reset Dual and Quad I/O access (revert to SPI bus mode)

Read Mode Register

Write Mode Register

FIGURE 2-1: BYTE READ SEQUENCE (SPI MODE)

CS

SCK

SI

SO

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

29 30 31 32 33 34 35 36 37 38 39

Instruction

24-bit Address

0 0 0 0 0 0 1 1 23 22 21 20

210

High-Impedance

Data Out

76543210

FIGURE 2-2: BYTE WRITE SEQUENCE (SPI MODE)

CS

SCK

SI

SO

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

29 30 31 32 33 34 35 36 37 38 39

Instruction

24-bit Address

Data Byte

0 0 0 0 0 0 1 0 23 22 21 20

2 1 07 6 5 4 3 2 1 0

High-Impedance

DS20005142C-page 6

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