6.7

Read identification page

The identification page (256 bytes) is an additional page that can be written and (later) permanently locked in

read-only mode.

This page is read with the read identification page instruction (see Table 4. Instruction set). The chip select signal

(S) is first driven low, the bits of the instruction byte and address bytes are then shifted in, on serial data input (D).

Address bit A10 must be 0, upper address bits are "don't care", and the data byte pointed to by the lower address

bits [A7:A0] is shifted out on serial data output (Q). If chip select (S) continues to be low, the internal address

register is automatically incremented, and the byte of data at the new address is shifted out.

The number of bytes to read in the ID page must not exceed the page boundary, otherwise unexpected data is

read (for example, when reading the ID page from location 90d, the number of bytes should be lower than or

equal to 166d, as the ID page boundary is 256 bytes).

The read cycle is terminated by driving chip select (S) high. The rising edge of the chip select (S) signal can occur

at any time during the cycle. The first byte addressed can be any byte within any page.

The instruction is not accepted, and is not executed, if a write cycle is currently in progress.

Figure 16. Read identification page sequence

MS30907V2

C

D

Q

23

2

1

3 4 5 6 7 8 9 10

28 29 30 31 32 33 34 35

22 21

3

2

1

0

36 37 38

7

6

5

4

3

1

7

0

High impedance

Data Out 1

Instruction

24-bit address

0

MSB

MSB

2

39

Data Out 2

S

M95M02-DR M95M02-DF

Read identification page

DS7024 - Rev 13

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