IS25LQ040(2012) Ver la hoja de datos (PDF) - Integrated Silicon Solution

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Fabricante

IS25LQ040
(Rev.:2012)

4 Mbit Single Operating Voltage Serial Flash Memory With 104 MHz Dual- or 100MHz Quad-Output SPI Bus Interface

Integrated Silicon Solution 

IS25LQ040

DEVICE OPERATION (CONTINUED)

RDID COMMAND (READ PRODUCT

IDENTIFICATION)/ Release Power-down

OPERATION

shifting the instruction code ‘‘ABh’’ and driving CE#

The Release from Power-down or High performance high as shown in figure 3.

Mode / Device ID instruction is a multi-purpose

Release from power-down will take the time duration of

instruction. The Read Product Identification (RDID)

tRES1 before the device will resume normal operation

instruction is for reading out the old style of 8-bit

and other instructions are accepted. The CE# pin must

Electronic Signature, whose values are shown as table remain high during the tRES1 time duration. If the

of ID Definitions. This is not same as RDID or JEDEC Release from Power-down / RDID instruction is issued

ID instruction. It’s not recommended to use for new

while an Erase, Program or Write cycle is in process

design. For new design, please use RDID or JEDEC ID (when BUSY equals 1) the instruction is ignored and

instruction.

will not have any effects on the current cycle

The RDES instruction code is followed by three dummy

bytes, each bit being latched-in on SI during the rising Table 12. Product Identification

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

Product Identification

First Byte

Manufacturer ID

Second Byte

Data

9Dh

7Fh

while CE# is at low.

Device ID:

Device ID1

Device ID2

To release the device from the power-down state Mode,

IS25LQ040C

12h

43h

the instruction is issued by driving the CE# pin low,

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

Rev. A

11

09/13/2012

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