ACE25C400

4MB Serial Flash Memory

VER 1.2

5

Memory Organization

The ACE25C400 array is organized into 2,048 programmable pages of 256-bytes each. Up to 256

bytes can be programmed (bits are programmed from 1 to 0) at a time. Pages can be erased in

groups of 16 (4KB sector erase), groups of 256 (64KB block erase) or the entire chip (chip erase). The

ACE25C400 has 128 erasable sectors and 8 erasable 64-k byte blocks respectively. The small 4KB

sectors allow for greater flexibility in applications that require data and parameter storage.

Block (64KB)

Sector (4KB)

Address Range

7

127

07F000h

07FFFFh

…

…

…

112

070000h

070FFFh

6

111

06F000h

06FFFFh

…

…

…

96

060000h

060FFFh

5

95

05F000h

05FFFFh

…

…

…

80

050000h

050FFFh

4

79

04F000h

04FFFFh

…

…

…

64

040000h

040FFFh

3

63

03F000h

03FFFFh

…

…

…

48

030000h

030FFFh

2

47

02F000h

02FFFFh

…

…

…

32

020000h

020FFFh

1

31

01F000h

01FFFFh

…

…

…

16

010000h

010FFFh

0

15

00F000h

00FFFFh

…

…

…

2

002000h

002FFFh

1

001000h

001FFFh

0

000000h

000FFFh