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參數(shù)資料
| 型號： | Am29LV800T-100 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | 8 Megabit (1,048,576 x 8-Bit/524,288 x 16-Bit) CMOS 3.0 Volt-only, Sectored Flash Memory |
| 中文描述： | 8兆位（1,048,576 x 8-Bit/524，288 x 16位），3.0伏的CMOS只，扇區(qū)閃存 |
| 文件頁數(shù)： | 11/48頁 |
| 文件大?。?/td> | 207K |
| 代理商： | AM29LV800T-100 |
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Am29LV800T/Am29LV800B
11
P R E L I M I N A R Y
Autoselect
The Autoselect mode allows the reading out of a binary
code from the device and will identify its manufacturer
and type. The intent is to allow programming equipment
to automatically match the device to be programmed
with its corresponding programming algorithm. The
Autoselect command may also be used to check the
status of write-protected sectors (see Table 3). This
mode is functional over the entire temperature range of
the device.
To activate this mode, the programming equipment
must force V
ID
(11.5–12.5 volts) on address pin A9.
Two identifier bytes may then be sequenced from the
device outputs by toggling address A0 from V
IL
to V
IH
.
All addresses are don’t cares except A0, A1, and A6
(see Table 3).
The manufacturer and device codes may also be read
via the command register, for instances when the
Am29LV800 is erased or programmed in a system
without access to high voltage on the A9 pin. The
command sequence is illustrated in Table 6.
Byte 0 (A0 = V
IL
) represents the manufacturer’s code
and byte 1 (A0 = V
IH
) the device identifier code. These
two bytes are given for the Am29LV800 in Table 3. All
identifiers for manufacturer and device exhibit odd
parity with DQ7 defined as the parity bit. In order to
read the proper device codes when executing Autose-
lect, A1 must be V
IL
(see Table 3). For device identifica-
tion in word mode (BYTE = V
IH
), DQ9 and DQ13 are
equal to ‘1’ and DQ8, DQ10–12, DQ14, and DQ15 are
equal to ‘0’.
If BYTE = V
IH
(for word mode), the device code is 22DAh
(for top boot block) or 225Bh (for bottom boot block). If
BYTE = V
IL
(for byte mode), the device code is DAh (for
top boot block) or 5Bh (for bottom boot block).
In order to determine which sectors are write protected,
A1 must be at V
IH
while running through the sector
addresses. If the selected sector is protected, the
device outputs a ‘1’ on DQ0.
Table 3.
Autoselect/Sector Protection Codes
X = Don’t care.
* Outputs 01h at protected sector addresses.
Type
Mode
A12–A18
A6
A1
A0
Code
(HEX)
DQ8–DQ15
DQ
7
DQ
6
DQ
5
DQ
4
DQ
3
DQ
2
DQ
1
DQ
0
Manufacturer Code:
AMD
X
L
L
L
01h
High-Z
0
0
0
0
0
0
0
1
29LV800 Device
(Top Boot Block)
Word
X
L
L
H
22DAh
DQ9 = 1,
DQ13 = 1,
Others = 0
1
1
0
1
1
0
1
0
Byte
X
DAh
High-Z
29LV800 Device
(Bottom Boot Block)
Word
X
L
L
H
225Bh
DQ9 = 1,
DQ13 = 1,
Others = 0
0
1
0
1
1
0
1
1
Byte
X
5Bh
High-Z
Sector Protection
Set Sector
Addresses
L
H
L
01h*
X
0
0
0
0
0
0
0
1
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