參數(shù)資料
型號(hào)： W78M32V70BC
英文描述： 8Mx32 Flash 3.3V Page Mode Simultaneous Read/Write Operation Multi-Chip Package
中文描述： 8Mx32閃光3.3V的頁(yè)面模式同步讀/寫操作多芯片封裝
文件頁(yè)數(shù)： 14/54頁(yè)
文件大?。?/td> 756K
代理商： W78M32V70BC
14
White Electronic Designs Corporation (602) 437-1520 www.wedc.com
White Electronic Designs
W78M32V-XBX
April 2006
Rev. 3
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
TABLE 5.
SecSi
TM
SECTOR ADDRESSES
Sector Size
128 words
64 words
64 words
Address Range
000000h–00007Fh
000000h-00003Fh
000040h-00007Fh
Device
Factory-Locked Area
Customer-Lockable Area
AUTOSELECT MODE
The autoselect mode provides manufacturer and device
identification, and sector protection verification, through
identifier codes output on DQ7–DQ0 for each chip. This
mode is primarily intended for programming equipment
to automatically match a device to be programmed with
its corresponding programming algorithm. However, the
autoselect codes can also be accessed in-system through
the command register.
When using programming equipment, the autoselect
mode requires V
ID
on address pin A9. Address pins
must be as shown in
Table 6
. In addition, when verifying
sector protection, the sector address must appear on
the appropriate highest order address bits (see
Table
4
).
Table 6
shows the remaining address bits that are
don’t care. When all necessary bits have been set as
required, the programming equipment may then read the
corresponding identifier code on DQ7–DQ0. However, the
autoselect codes can also be accessed in-system through
the command register, for instances when the device is
erased or programmed in a system without access to high
voltage on the A9 pin. The command sequence is illustrated
in
Table 13
. Note that if a Bank Address (BA) on address
bits A22–A20 is asserted during the third write cycle of the
autoselect command, the host system can read autoselect
data that bank and then immediately read array data from
the other bank, without exiting the autoselect mode.
To access the autoselect codes in-system, the host system
can issue the autoselect command via the command
register, as shown in
Table 13
. This method does not require
V
ID
. Refer to the
Autoselect Command Sequence
section
for more information.
TABLE 6. AUTOSELECT CODES (HIGH VOLTAGE METHOD)
CS#
OE#
WE#
A22
to
A12
L
L
H
X
X
V
ID
L
L
H
X
X
V
ID
Description
A10
A9
A8
A7
A6
A5
to
A4
X
L
A3
A2
A1
A0
DQ15
to
DQ0 (each chip)
0004h
227Eh
Manufacturer ID:
X
X
L
L
L
L
L
L
L
L
L
L
L
H
D
Read
Cycle 1
Read
Cycle 2
Read
Cycle 3
L
H
H
H
L
2220
L
H
H
H
H
2200h
Sector Protection
Verification
SecSi Indicator Bit
(DQ7, DQ6)
L
L
H
SA
X
V
ID
X
L
L
L
L
L
H
L
0001h (protected),
0000h (unprotected)
00C0h (factory and
user locked)
L
L
H
X
X
V
ID
X
X
L
X
L
L
H
H
Legend: L = Logic Low = V
IL
, H = Logic High = V
IH
, BA = Bank Address, SA = Sector Address, X = Don’t care. Note: The autoselect codes may also be accessed in-system
via command sequences
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