MBM29LV400TC-70/-90/-12/MBM29LV400BC-70/-90/-12
The manufacturer and device codes may also be read via the command register, for instances when the
MBM29LV400TC/BC are erased or programmed in a system without access to high voltage on the A9 pin. The
command sequence is illustrated in Table 7. (Refer to Autoselect Command section.)
Byte 0 (A0 = VIL) represents the manufacturer’s code (Fujitsu = 04H) and (A0 = VIH) represents the device identifier
code (MBM29LV400TC = B9H and MBM29LV400BC = BAH for ×8 mode; MBM29LV400TC = 22B9H and
MBM29LV400BC=22BAHfor×16mode).Thesetwobytes/wordsaregiveninthetables4.1and4.2.Allidentifiers
for manufactures and device will exhibit odd parity with DQ7 defined as the parity bit. In order to read the proper
device codes when executing the autoselect, A1 must be VIL. (See Tables 4.1 and 4.2.)
Table 4 .1 MBM29LV400TC/400BC Sector Protection Verify Autoselect Codes
*1
Type
Manufacture’s Code
A12 to A17
A6
A1
A0
A-1
VIL
VIL
X
Code (HEX)
04H
X
VIL
VIL
VIL
Byte
Word
Byte
B9H
MBM29LV400TC
MBM29LV400BC
X
X
VIL
VIL
VIH
22B9H
BAH
Device Code
VIL
X
VIL
VIL
VIL
VIH
VIH
VIL
Word
22BAH
Sector
Addresses
Sector Protection
VIL
01H*2
*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
DQ15 DQ14 DQ13 DQ12 DQ11 DQ10 DQ9 DQ8 DQ7 DQ6 DQ5 DQ4 DQ3 DQ2 DQ1 DQ0
Type
Code
A-1/0
Manufacturer’s Code
04H
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
0
0
1
1
1
1
0
0
1
1
1
1
0
1
0
0
0
0
0
0
0
0
1
1
0
0
1
1
0
0
1
(B) B9H A-1 HI-Z HI-Z HI-Z HI-Z HI-Z HI-Z HI-Z
MBM29LV400TC
(W) 22B9H
0
0
1
0
0
0
1
0
Device
Code
(B) BAH A-1 HI-Z HI-Z HI-Z HI-Z HI-Z HI-Z HI-Z
MBM29LV400BC
(W) 22BAH
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
A-1/0
Sector Protection
01H
(B): Byte mode
(W): Word mode
12
FUJITSU [ FUJITSU ]
