M29F040 Ver la hoja de datos (PDF) - STMicroelectronics
Número de pieza
componentes Descripción
Fabricante
M29F040 Datasheet PDF : 31 Pages
| |||
Figure 3. Memory Map and Block Address Table
M29F040
A18 A17 A16
1
1
1
1
1
0
1
0
1
1
0
0
0
1
1
0
1
0
0
0
1
0
0
0
AI01362B
64K Bytes Block
64K Bytes Block
64K Bytes Block
64K Bytes Block
64K Bytes Block
TOP
BOTTOM
ADDRESS ADDRESS
7FFFFh 70000h
6FFFFh 60000h
5FFFFh 50000h
4FFFFh 40000h
3FFFFh 30000h
2FFFFh 20000h
1FFFFh 10000h
0FFFFh 00000h
Instructions and Commands
The Command Interface (C.I.) latches commands
written to the memory. Instructions are made up
from one or more commands to perform Read
Array/Reset, Read Electronic Signature, Block
Erase, Chip Erase, Program, Block Erase Suspend
and Erase Resume. Commands are made of ad-
dress and data sequences. Addresses are latched
on the falling edge of W or E and data is latched
on the rising of W or E. The instructions require from
1 to 6 cycles, the first or first three of which are
always write operations used to initiate the com-
mand. They are followed by either further write
cycles to confirm the first command or execute the
command immediately. Command sequencing
must be followed exactly. Any invalid combination
of commands will reset the device to Read Array.
The increased number of cycles has been chosen
to assure maximum data security. Commands are
initialised by two preceding coded cycles which
unlock the Command Interface. In addition, for
Erase, command confirmation is again preceeded
by the two coded cycles.
P/E.C. status is indicated during command execu-
tion by Data Polling on DQ7, detection of Toggle on
Table 7. Commands
Hex Code
Command
00h
Read
10h
Chip Erase Confirm
30h
Block Erase Resume/Confirm
80h
Set-up Erase
90h
Read Electronic Signature/
Block Protection Status
A0h
Program
B0h
Erase Suspend
F0h
Read Array/Reset
DQ6, or Error on DQ5 and Erase Timer DQ3 bits.
Any read attempt during Program or Erase com-
mand execution will automatically output those four
bits. The P/E.C. automatically sets bits DQ3, DQ5,
DQ6 and DQ7. Other bits (DQ0, DQ1, DQ2 and
DQ4) are reserved for future use and should be
masked.
7/31
Share Link: 