IS25WD020-JKLE datasheet(11/35 Pages) ISSI

Part #	IS25WD020-JKLE

Description	2 Mbit / 4 Mbit Single Operating Voltage Serial Flash Memory

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Manufacturer	ISSI [Integrated Silicon Solution, Inc]

Direct Link	http://www.issi.com

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11 / 35 page

IS25WD020/040

Integrated Silicon Solution, Inc.- www.issi.com

Rev. F

07/31/2013

11

DEVICE OPERATION (CONTINUED)

RDID COMMAND (READ PRODUCT

IDENTIFICATION) OPERATION

The Read Product Identification (RDID) instruction is

for reading out the old style of 8-bit Electronic

Signature, whose values are shown as table of ID

Definitions. This is not same as RDID or JEDEC ID

ins

truction. It’s not recommended to use for new

design. For new design, please use RDID or JEDEC ID

instruction.

The RDES instruction code is followed by three dummy

bytes, each bit being latched-in on SI during the rising

edge of SCK. Then the Device ID is shifted out on SO

with the MSB first, each bit been shifted out during the

falling edge of SCK. The RDES instruction is ended by

CE# goes high. The Device ID outputs repeatedly if

continuously send the additional clock cycles on SCK

while CE# is at low.

Table 11. Product Identification

Product Identification

Data

Manufacturer ID

First Byte

9Dh

Second Byte

7Fh

Device ID:

Device ID 1

Device ID 2

IS25WD020

11h

32h

IS25WD040

12h

33h

Figure 3. Read Product Identification Sequence

0

1

8

31

38

39

46

47

54

HIGH IMPEDANCE

Device ID1

SCK

CE#

SI

SO

INSTRUCTION

9

7

1010 1011b

3 Dummy Bytes

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IS25WD020-JKLE Datasheet(PDF) 11 Page - Integrated Silicon Solution, Inc

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