IS25LE128E-RMLA3:P-TY datasheet(62/197 Pages) ISSI

62 / 197 page

IS25LE256E/128E

IS25WE256E/128E

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

Rev.A9

03/07/2023

8.3 NORMAL READ OPERATION (NORD, 03h or 4NORD, 13h)

The Normal Read (NORD) instruction is used to read memory contents at a maximum frequency of 80MHz.

• 03h (EXTADD=0) is followed by a 3-byte address (A23-A0) or

• 03h (EXTADD=1) is followed by a 4-byte address (A31-A0) or

• 13h is followed by a 4-byte address (A31-A0)

The Normal Read instruction code is transmitted via the SI line, followed by three (A23 - A0) or four (A31

– A0)

address bytes of the first memory location to be read as above. A total of 24 or 32 address bits are shifted in, but

only AVMSB (Valid Most Significant Bit) - A0 are decoded. The remaining bits (A31

– AVMSB+1) are ignored. The first

byte addressed can be at any memory location. Upon completion, any data on the SI will be ignored. Refer to Table

8.5 for the related Address Key.

The first byte data (D7 - D0) is shifted out on the SO line, MSB first. A single byte of data, or up to the whole memory

array, can be read out in one Normal Read instruction. The address is automatically incremented by one after each

byte of data is shifted out. The read operation can be terminated at any time by driving CE# high (VIH) after the

data comes out. When the highest address of the device is reached, the address counter will roll over to the

000000h address, allowing the entire memory to be read in one continuous Read instruction.

If the Normal Read instruction is issued while an Erase, Program or Write operation is in process (WIP=1) the

instruction is ignored and will not have any effects on the current operation.

Table 8.5 Address Key

Mode

Valid Address

256Mb

128Mb

3 byte address

AVMSB(2)

–A0

A23-A0

4 byte address

A24-A0 (A31-A25=X)(2)

A23-A0 (A31-A24=X)(2)

Notes:

X=Don’t Care

AVMSB is a Valid MSB. In 4 byte address for 256Mb, A31 is an MSB, and A24 is a Valid MSB.

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