MBM29F400TC-55/-70/-90/MBM29F400BC-55/-70/-90
Table 4 .1 MBM29F400TC/BC Sector Protection Verify Autoselect Codes
Code
Type
Manufacturer’s Code
A12 to A17
A6
A1
A0
A-1*1
(HEX)
X
VIL
VIL
VIL
VIL
VIL
X
04H
Byte
Word
Byte
23H
MBM29F400TC
MBM29F400BC
X
X
VIL
VIL
VIH
2223H
ABH
Device Code
VIL
X
VIL
VIL
VIL
VIH
VIH
VIL
Word
22ABH
Sector
Addresses
01H*2
Sector Protection
VIL
*1: A-1 is for Byte mode.
*2: Outputs 01H at protected sector addresses and outputs 00H at unprotected sector addresses.
Table 4 .2 Expanded Autoselect Code Table
DQ DQ DQ DQ DQ DQ DQ DQ
Type
Code DQ15 DQ14 DQ13 DQ12 DQ11 DQ10 DQ9 DQ8
04H A-1/0
7
6
5
4
3
2
1
0
Manufacturer’s Code
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
MBM29F400TC 23H
A-1 HI-Z HI-Z HI-Z HI-Z HI-Z HI-Z HI-Z 0
0
0
1
1
0
0
0
0
0
0
1
1
1
1
(B)
2223
H
0
0
1
0
0
0
1
0
0
(W)
Device
Code
MBM29F400BC ABH
A-1 HI-Z HI-Z HI-Z HI-Z HI-Z HI-Z HI-Z 1
0
0
1
1
0
0
1
1
0
0
1
1
1
1
(B)
22AB
H
0
0
1
0
0
0
1
0
1
(W)
Sector Protection
01H A-1/0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
(B): Byte mode
(W): Word mode
Write
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 VIL, while CE is at VIL and OE is at VIH. Addresses are latched on
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.
Sector Protection
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.
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