13
MBM29LV160T
-80/-90/-12
/MBM29LV160B
-80/-90/-12
The manufacturer and device codes may also be read via the command register, for instances when the
MBM29LV160T/B is erased or programmed in a system without access to high voltage on the A
9
pin. The
command sequence is illustrated in Table 7, Command Definitions.
Byte 0 (A
0
= V
IL
) represents the manufacture’s code and byte 1 (A
0
= V
IH
) represents the device identifier code.
For the MBM29LV160T/B these two bytes are given in the Table 4.2. All identifiers for manufactures and device
will exhibit odd parity with DQ
7
defined as the parity bit. In order to read the proper device codes when executing
the Autoselect, A
1
must be V
IL
. (See Tables 2 or 3.) For device indentification in word mode (BYTE = V
IH
), DQ
9
and DQ
13
are equal to ‘1’ and DQ
8
, DQ
10
to DQ
12
, DQ
14
, and DQ
15
are equal to ‘0’.
If BYTE = V
IL
(for byte mode), the device code is C4H (for top boot block) or 49H (for bottom boot block). If BYTE
= V
IH
(for word mode), the device code is 22C4H (for top boot block) or 2249H (for bottom boot block).
In order to determine which sectors are write protected, A
1
must be at V
IH
while running through the sector
addresses; if the selected sector is protected, a logical ‘1’ will be output on DQ
0
(DQ
0
=1).
*1: A
-1
is for Byte mode.
*2: Outputs 01H at protected sector addresses and outputs 00H at unprotected sector addresses.
(B): Byte mode
(W): Word mode
Table 4.1 MBM29LV160T/B Sector Protection Verify Autoselect Code
Type
A
12
to A
18
A
6
A
1
A
0
A
-1
*
1
Code
(HEX)
Manufacture’s Code
X
V
IL
V
IL
V
IL
V
IL
04H
Device Code
MBM29LV160T
Byte
X
V
IL
V
IL
V
IH
V
IL
C4H
Word
X
22C4H
MBM29LV160B
Byte
X
V
IL
V
IL
V
IH
V
IL
49H
Word
X
2249H
Sector Protection
Sector
Addresses
V
IL
V
IH
V
IL
V
IL
01H*
2
Table 4.2 Expanded Autoselect Code Table
Type
Code DQ
15
DQ
14
DQ
13
DQ
12
DQ
11
DQ
10
DQ
9
DQ
8
DQ
7
DQ
6
DQ
5
DQ
4
DQ
3
DQ
2
DQ
1
DQ
0
Manufacture’s Code
04H A
-1
/0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
Device
Code
MBM29LV160T
(B)
C4H A
-1
HI-Z HI-Z HI-Z HI-Z HI-Z HI-Z HI-Z
1
1
0
0
0
1
0
0
(W) 22C4H
0
0
1
0
0
0
1
0
1
1
0
0
0
1
0
0
MBM29LV160B
(B)
49H A
-1
HI-Z HI-Z HI-Z HI-Z HI-Z HI-Z HI-Z
0
1
0
0
1
0
0
1
(W)
2249H
0
0
1
0
0
0
1
0
0
1
0
0
1
0
0
1
Sector Protection
01H A
-1
/0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1