IS25LP256D-RGLA3 datasheet(39/174 Pages) ISSI

39 / 174 page

IS25LP256D

IS25WP256D

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

Rev A6

04/15/2019

8.2 COMMAND SET SUMMARY

Extended Addressing

To accommodate addressing above 128Mb (24-bit), there are three options:

1. New instructions with 4-byte (32-bit) address. See Table 8.2.

2. 4-byte addressing with the 3-byte address instructions:

For backward compatibility to the 3-byte address instructions, the standard instructions can be used in

conjunction with the EXTADD Bit in the Bank Address Register (BAR[7]) or Enter 4-byte Address Mode to switch

from 3 bytes to 4 bytes of address field. When EXTADD bit is set to 1 or Enter 4-byte Address Mode command

is issued only in the case that EXTADD bit = 0, the instructions are changed to require 4-byte (32-bit) for the

address field. See Table 8.3.

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

For backward compatibility to the 3-byte addressing, the standard instructions can be used in conjunction with

the Bank Address Register. See Table 8.3.

 The Bank Address Register is used to switch between 128Mbit (16Mbyte) banks of memory, the standard 3-

byte address selects an address within the bank selected by the Bank Address Register.

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

o This applies to read, erase, and program commands.

 The Bank Address Register provides the high order (4th) byte of address, which is used to address the

available memory at addresses greater than 128Mbit.

 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

Bank Address Register Bit 0

Bank

Memory Array Address Range

00000000h

00FFFFFFh

01000000h

01FFFFFFh

IS25LP256D-RGLA3 Datasheet(PDF) 39 Page - Integrated Silicon Solution, Inc