IS25LE01G-RILA3-TY datasheet(50/186 Pages) ISSI

50 / 186 page

IS25LE01G

IS25WE01G

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

Rev. A6

01/14/2025

8.2 COMMAND SET SUMMARY

Extended Addressing

To accommodate addressing above 128Mb (24-bit) for read, erase, write and program operations, there are three

options:

1. New 4-byte (32-bit) address instructions.

New 4-byte instructions are valid in both 4-byte addressing mode and 3-byte addressing mode. See Table 8.2.

2. 4-byte addressing mode with legacy 3-byte address instructions.

There are 2 ways to enter into 4-byte addressing mode.

- The device can be set to 4-byte addressing mode by setting EXTADD bit = “1” in the Bank Address Register

(BAR[7])

- If EXTADD bit is set to “0” (3-byte addressing mode), also the device can be switched to 4-byte addressing

mode by issuing Enter 4-byte Address Mode Command See Table 8.3.

- BA24, BA25, and BA26 bits are ignored in 4-byte addressing mode

3. 3-byte addressing mode with the 3-byte address instructions:

The device can be set to 3-

byte addressing mode by setting EXTADD bit = “0” in the Bank Address Register

(BAR [7])

• BA24, BA25, and BA26 select individual bank (128Mb) in 3-byte addressing mode.

• 3-byte address selects an address within the bank (128Mb)

• The host system writes the Bank Address Register to access beyond the first 128Mbit of memory.

• Bank Address Register bits are volatile.

o On power up, the default is Bank0 (the lowest address 16 Mbytes).

• For Read, the device will continuously transfer out data until the end of the array.

o There is no bank to bank delay.

o The Bank Address Register is not updated.

o The Bank Address Register value is used only for the initial address of an access.

Table 8.1 Bank Address Map

1Gb

BA[26:24]

Bank

Memory Array Address Range

000

0000 0000h

00FF FFFFh

001

0100 0000h

01FF FFFFh

010

0200 0000h

02FF FFFFh

011

0300 0000h

03FF FFFFh

100

0400 0000h

04FF FFFFh

101

0500 0000h

05FF FFFFh

110

0600 0000h

06FF FFFFh

111

0700 0000h

07FF FFFFh

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