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IS25LD256C

256Kbit Single Operating Voltage Serial Flash Memory With 100 MHz Dual-Output SPI Bus Interface

Integrated Silicon Solution 

IS25LD256C

DEVICE OPERATION (CONTINUED)

RDID COMMAND (READ PRODUCT

IDENTIFICATION) OPERATION

CE# goes high. The Device ID outputs repeatedly if

The Read Product Identification (RDID) instruction is continuously send the additional clock cycles on SCK

for reading out the old style of 8-bit Electronic

while CE# is at low.

Signature, whose values are shown as table of ID

Definitions. This is not same as RDID or JEDEC ID

instruction. It’s not recommended to use for new

Table 11. Product Identification

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

instruction.

Product Identification

Data

The RDES instruction code is followed by three dummy

First Byte

9Dh

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

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

Second Byte

7Fh

with the MSB first, each bit been shifted out during the Device ID:

Device ID 1

Device ID 2

falling edge of SCK. The RDES instruction is ended by

IS25LD256C

02h

2Fh

Figure 3. Read Product Identification Sequence

CE#

01

78 9

31

38 39

46 47

54

SCK

INSTRUCTION 3 Dummy Bytes

SI

1010 1011b

HIGH IMPEDANCE

SO

Device ID1

Device ID1

Device ID1

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

11

Rev. A

09/11/2012

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