MBM29F400BC-55 FUJITSU [Fujitsu Component Limited.], MBM29F400BC-55 Datasheet - Page 11

• Manufacturer Part Number: MBM29F400BC-55
• Description: 4M (512K X 8/256K X 16) BIT
• Manufacturer: FUJITSU [Fujitsu Component Limited.]

*1: A
*2: Outputs 01H at protected sector addresses and outputs 00H at unprotected sector addresses.
Manufacturer’s Code
Device
Code
Sector Protection
(B): Byte mode
(W): Word mode
Write
Sector Protection
Manufacturer’s Code
Device Code
Sector Protection
Device erasure and programming are accomplished via the command register. The contents of the register serve
as inputs to the internal state machine. The state machine outputs dictate the function of the device.
The command register itself does not occupy any addressable memory location. The register is a latch used to
store the commands, along with the address and data information needed to execute the command. The
command register is written by bringing WE to V
the falling edge of WE or CE, whichever happens later; while data is latched on the rising edge of WE or CE,
whichever happens first. Standard microprocessor write timings are used.
Refer to AC Write Characteristics and the Erase/Programming Waveforms for specific timing parameters.
The MBM29F400TC/BC features hardware sector protection. This feature will disable both program and erase
operations in any number of sectors (0 through 10). The sector protection feature is enabled using programming
equipment at the user’s site. The device is shipped with all sectors unprotected.
-1
is for Byte mode.
Type
MBM29F400TC
(B)
MBM29F400BC
(B)
MBM29F400TC
MBM29F400TC
MBM29F400BC
Table 4 .1 MBM29F400TC/BC Sector Protection Verify Autoselect Codes
Type
(W)
(W)
Code DQ
22AB
2223
ABH
23H
04H A
01H A
Table 4 .2 Expanded Autoselect Code Table
H
H
Word
Word
Byte
Byte
A
A
-1
-1
0
0
-1
-1
/0 0
/0 0
15
Addresses
DQ
A
HI-Z
HI-Z
Sector
0
0
12
14
to A
X
X
X
DQ
HI-Z
HI-Z
0
1
1
0
-55/-70/-90
17
13
IL
, while CE is at V
DQ
HI-Z
HI-Z
0
0
0
0
12
DQ
HI-Z
HI-Z
V
V
V
V
A
0
0
0
0
IL
IL
IL
IL
6
11
DQ
HI-Z
HI-Z
/MBM29F400BC
0
0
0
0
10
HI-Z
HI-Z
DQ
IL
0
1
1
0
V
V
V
V
A
and OE is at V
IL
IL
IL
IH
9
1
HI-Z
HI-Z
DQ
0
0
0
0
8
DQ
0
0
0
1
1
0
7
V
V
V
V
A
DQ
IH
IH
IL
IL
0
0
0
0
0
0
0
6
IH
. Addresses are latched on
DQ
0
1
1
1
1
0
5
DQ
0
0
0
0
0
0
A
4
V
V
V
V
X
X
-1
IL
IL
IL
IL
*
DQ
1
0
0
0
1
1
0
3
-55/-70/-90
DQ
1
0
0
0
0
0
2
22ABH
2223H
(HEX)
Code
01H*
ABH
04H
23H
DQ
0
1
1
1
1
0
1
2
DQ
0
1
1
1
1
1
0
11