IS25LQ040
SYSTEM CONFIGURATION
The IS25LQ040 devices are designed to interface directly with the synchronous Serial Peripheral Interface (SPI)
of the Motorola MC68HCxx series of microcontrollers or any SPI interface-equipped system controllers. The
devices have two superset features that can be enabled through specific software instructions and the
Configuration Register:
1. Configurable sector size: The memory array of
IS25LQ040 is divided into uniform 4 KByte sectors or uniform 64 KByte blocks (a block consists of sixteen
adjacent sectors).
Table 1 illustrates the memory map of the devices.
BLOCK/SECTOR ADDRESSES
Table 1. Block/Sector Addresses of IS25LQ040
Memory Density
4Mbit
Block No.
(64Kbyte)
Block 0
Block 1
:
Block 7
Sector No.
Sector 0
Sector 1
:
Sector 15
Sector 16
Sector 17
:
Sector 31
:
Sector 127
Sector
Size
(KBytes)
4
4
:
4
4
4
:
4
:
4
Address Range
000000h - 000FFFh
001000h - 001FFFh
:
00F000h - 00FFFFh
010000h - 010FFFh
011000h - 011FFFh
:
01F000h - 01FFFFh
:
070000h – 07FFFFh
Integrated Silicon Solution, Inc.- www.issi.com
Rev. A
6
09/13/2012