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M295V400T-55N3R Datasheet(PDF) 4 Page - STMicroelectronics

Part # M295V400T-55N3R
Description  4 Mbit 512Kb x8 or 256Kb x16, Boot Block Single Supply Flash Memory
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M295V400T-55N3R Datasheet(HTML) 4 Page - STMicroelectronics

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16K BOOT BLOCK
AI01730
7FFFFh
7C000h
7BFFFh
7A000h
79FFFh
40000h
3FFFFh
8K PARAMETER BLOCK
8K PARAMETER BLOCK
32K MAIN BLOCK
64K MAIN BLOCK
64K MAIN BLOCK
64K MAIN BLOCK
20000h
1FFFFh
10000h
0FFFFh
00000h
M29F400T
64K MAIN BLOCK
64K MAIN BLOCK
64K MAIN BLOCK
78000h
77FFFh
70000h
6FFFFh
60000h
5FFFFh
50000h
4FFFFh
M29F400B
16K BOOT BLOCK
8K PARAMETER BLOCK
8K PARAMETER BLOCK
32K MAIN BLOCK
64K MAIN BLOCK
64K MAIN BLOCK
64K MAIN BLOCK
64K MAIN BLOCK
64K MAIN BLOCK
64K MAIN BLOCK
40000h
3FFFFh
30000h
2FFFFh
20000h
1FFFFh
7FFFFh
70000h
6FFFFh
60000h
5FFFFh
50000h
4FFFFh
10000h
0FFFFh
08000h
07FFFh
04000h
03FFFh
00000h
64K MAIN BLOCK
06000h
05FFFh
64K MAIN BLOCK
30000h
2FFFFh
Figure 3. Memory Map and Block Address Table (x8)
Command Interface
Instructions, made up of commands written in cy-
cles, can be given to the Program/Erase Controller
through a Command Interface (C.I.). For added
data protection, program or erase execution starts
after 4 or 6 cycles. The first,second, fourth and fifth
cycles are used to input Coded cycles to the C.I.
This Coded sequence is the same for all Pro-
gram/Erase Controller instructions. The ’Com-
mand’ itself and its confirmation, when applicable,
are given on the third, fourth or sixth cycles. Any
incorrect command or any improper command se-
quence will reset the device to Read Array mode.
Instructions
Seven instructions are defined to perform Read
Array, Auto Select (to read the Electronic Signature
or Block Protection Status), Program, Block Erase,
Chip Erase, Erase Suspend and Erase Resume.
The internal P/E.C. automatically handles all tim-
ing and verification of the Program and Erase
operations. The Status Register Data Polling, Tog-
gle, Error bits and the RB output may be read at
any time, during programming or erase, to monitor
the progress of the operation.
Instructions are composed of up to six cycles. The
first two cycles input a Coded sequence to the
Command Interface which is common to all instruc-
tions (see Table 8). The third cycle inputs the
instruction set-up command. Subsequent cycles
output the addressed data, Electronic Signature or
Block Protection Status for Read operations. In
order to give additional data protection, the instruc-
tions for Program and Block or Chip Erase require
further command inputs. For a Program instruction,
the fourth command cycle inputs the address and
data to be programmed. For an Erase instruction
(Block or Chip), the fourth and fifth cycles input a
further Coded sequence before the Erase confirm
command on the sixth cycle. Erasure of a memory
block may be suspended, in order to read data from
another block or to program data in another block,
and then resumed.
When power is first applied or if VCC falls below
VLKO, the command interface is reset to Read
Array.
4/34
M29F400T, M29F400B


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