MBM29LV017 Ver la hoja de datos (PDF) - Fujitsu
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MBM29LV017 Datasheet PDF : 52 Pages
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MBM29LV017-80/-90/-12
The manufacturer and device codes may also be read via the command register, for instances when the
MBM29LV017 is erased or programmed in a system without access to high voltage on the A9 pin. The command
sequence is illustrated in Table 6. (Refer to Autoselect Command section.)
Byte 0 (A0 = VIL) represents the manufacture’s code (Fujitsu = 04H) and byte 1 (A0 = VIH) represents the device
identifier code MBM29LV017 = C8H. All identifiers 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 3.1 and 3.2.)
In order to determine which sectors are write protected, A1 must be at VIH while running through the sector
addresses; if the selected sector is protected, a logical ‘1’ will be output on DQ0 (DQ0 = 1).
Table 3.1 MBM29LV017 Sector Protection Verify Autoselect Code
Type
A16 to A20
A10
A6
A1
A0
Manufacture’s Code
X
VIL
VIL
VIL
VIL
Device Code MBM29LV017
X
VIL
VIL
VIL
VIH
Sector Protection
Sector
Addresses
VIL
VIL
VIH
VIL
Code (HEX)
04H
C8H
01H*1
*1: Outputs 01H at protected sector addresses and outputs 00H at unprotected sector addresses.
Table 3.2 Expanded Autoselect Code Table
Type
Code DQ7 DQ6 DQ5 DQ4 DQ3 DQ2 DQ1 DQ0
Manufacture’s Code
04H
0
0
0
0
0
1
0
0
Device Code MBM29LV017
C8H 1
1
0
0
1
0
0
0
Sector Protection
01H
0
0
0
0
0
0
0
1
11
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