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AM29LV008T-90ECB 数据表(PDF) 9 Page - Advanced Micro Devices

部件名 AM29LV008T-90ECB
功能描述  8 Megabit (1,048,576 x 8-Bit) CMOS 3.0 Volt-only, Sectored Flash Memory
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制造商  AMD [Advanced Micro Devices]
网页  http://www.amd.com
标志 AMD - Advanced Micro Devices

AM29LV008T-90ECB 数据表(HTML) 9 Page - Advanced Micro Devices

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Am29LV008T/Am29LV008B
9
PRELIMINARY
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 Au-
toselect command may also be used to check the sta-
tus of write-protected sectors (see Table 2). This mode
is functional over the entire temperature range of the
device.
To activate this mode, the programming equipment
must force VID (12.0 V ± 5%) on address pin A9. Two
identifier bytes may then be sequenced from the device
outputs by toggling address A0 from VIL to VIH. All ad-
dresses are don’t cares except A0, A1, and A6 see
Table 2.
The manufacturer and device codes may also be read
via the command register, for instances when the
Am29LV008 is erased or programmed in a system with-
out access to high voltage on the A9 pin. The command
sequence is illustrated in Table 5 on page 13.
Byte 0 (A0 = VIL) represents the manufacturer’s code
and byte 1 (A0 = VIH) the device identifier code. For the
Am29LV008 these two bytes are given in Table 2. All
identifiers for manufacturer and device will 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 VIL (see Table 2). The device code is
3EH (for top boot block) or 37H (for bottom boot block).
In order to determine which sectors are write protected,
A1 must be at VIH while running through the sector ad-
dresses; if the selected sector is protected, a logical ‘1’
will be output on DQ0 (DQ0 = 1).
Table 2.
Autoselect/Sector Protection Codes
X = Don’t care.
* Outputs 01H at protected sector addresses.
Type
A13–A19
A6
A1
A0
Code
(HEX)
DQ
7
DQ
6
DQ
5
DQ
4
DQ
3
DQ
2
DQ
1
DQ
0
Manufacturer Code: AMD
X
L
L
L
01H
00000001
29LV008 Device
(Top Boot Block)
X
L
L
H
3EH
00111110
29LV008 Device
(Bottom Boot Block)
X
L
L
H
37H
00110111
Sector Protection
Set Sector
Addresses
L
H
L
01H*
00000001


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