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MBM29F040C-70PFTN Datasheet(PDF) 11 Page - SPANSION

Part # MBM29F040C-70PFTN
Description  FLASH MEMORY 4M (512K x 8) BIT
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Manufacturer  SPANSION [SPANSION]
Direct Link  http://www.spansion.com
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10
MBM29F040C-55/-70/-90
* : Outputs 01H at protected sector addresses and 00H at unprotected sector addresses.
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 MBM29F040C features hardware sector protection. This feature will disable both program and erase
operations in any number of sectors (0 through 8). The sector protection feature is enabled using programming
equipment at the user’s site. The device is shipped with all sectors unprotected.
To activate this mode, the programming equipment must force VID on address pin A9 and control pin OE, (suggest
VID = 11.5 V) and CE = VIH. The sector addresses (A18, A17 and A16) should be set to the sector to be protected.
Table 4 defines the sector address for each of the eight (8) individual sectors. Programming of the protection
circuitry begins on the falling edge of the WE pulse and is terminated with the rising edge of the same. Sector
addresses must be held constant during the WE pulse. See figures 11 and 17 sector protection waveforms and
algorithm.
Table 3
MBM29F040C Sector Protection Verify Autoselect Codes
Type
A18
A17
A16
A6
A1
A0
Code
(HEX) DQ
7
DQ6 DQ5 DQ4 DQ3 DQ2 DQ1 DQ0
Manufacture’s
Code
XXX
VIL
VIL
VIL
04H
00000100
Device Code
X
X
X
VIL
VIL
VIH
A4H
10100100
Sector
Protection
Sector
Addresses
VIL
VIH
VIL
01H*
00000001
Table 4
Sector Address Tables
Sector Address
A18
A17
A16
Address Range
SA0
0
0
0
00000H to 0FFFFH
SA1
0
0
1
10000H to 1FFFFH
SA2
0
1
0
20000H to 2FFFFH
SA3
0
1
1
30000H to 3FFFFH
SA4
1
0
0
40000H to 4FFFFH
SA5
1
0
1
50000H to 5FFFFH
SA6
1
1
0
60000H to 6FFFFH
SA7
1
1
1
70000H to 7FFFFH


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