AM29F800T-70FIB データシートの表示（PDF） - Advanced Micro Devices
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AM29F800T-70FIB
Advanced Micro Devices
AM29F800T-70FIB Datasheet PDF : 41 Pages
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PRELIMINARY
In the standby mode the outputs are in the high imped-
ance state, independent of the OE input.
Output Disable
With the OE input at a logic high level (VIH), output from
the device is disabled. This will cause the output pins
to be in a high impedance state.
Autoselect
The autoselect mode allows the reading of a binary
code from the device and will identify its manufacturer
and type. This mode is intended for use by program-
ming equipment for the purpose of automatically
matching the device to be programmed with its corre-
sponding programming algorithm. This mode is func-
tional over the entire temperature range of the device.
To activate this mode, the programming equipment
must force VID (11.5 V to 12.5 V) on address pin A9.
Two identifier bytes may then be sequenced from the
device outputs by toggling address A0 from VIL to VIH.
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
Am29F800 is erased or programmed in a system with-
out access to high voltage on the A9 pin. The command
sequence is illustrated in Table 4 (see Autoselect Com-
mand Sequence).
Byte 0 (A0 = VIL) represents the manufacturer’s code
(AMD=01H) and byte 1 (A0 = VIH) the device identifier
code (Am29F800T = D6H and Am29F800B = 58H for
x8 mode; Am29F800T = 22D6H and Am29F800B =
2258H for x16 mode). These two bytes/words are
given in the table below. 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 the Autoselect, A1 must be VIL (see
Tables 3 and 4).
The autoselect mode also facilitates the determination
of sector protection in the system. By performing a read
operation at the address location XX02H with the
higher order address bits A12–A18 set to the desired
sector address, the device will return 01H for a pro-
tected sector and 00H for a non-protected sector.
Table 3. Am29F800 Sector Protection Verify Autoselect Codes
Type
A12–A18
A6
A1
A0
Manufacturer Code—AMD
X
Am29F800 Device
Byte
Am29F800T
X
Word
Byte
Am29F800B
X
Word
VIL
VIL
VIL
VIL
VIL
VIH
VIL
VIL
VIH
Sector Protection
Sector
Address
VIL
VIH
VIL
*Outputs 01H at protected sector addresses
Code (HEX)
01H
D6H
22D6H
58H
2258H
01H*
Table 4. Expanded Autoselect Code Table
Type
Code
DQ
15
DQ
14
DQ
13
DQ
12
DQ
11
DQ
10
DQ
9
DQ DQ DQ DQ DQ DQ DQ DQ DQ
8 76543210
Manufacturer Code—AMD 01H 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
Am29F800T(B) D6H A-1 HI-Z HI-Z HI-Z HI-Z HI-Z HI-Z HI-Z 1 1 0 1 0 1 1 0
Am29F800
(W) 22D6H 0 0 1 0 0 0 1 0 1 1 0 1 0 1 1 0
Device
Am29F800B(B) 58H A-1 HI-Z HI-Z HI-Z HI-Z HI-Z HI-Z HI-Z 0 1 0 1 1 0 0 0
(W) 2258H 0 0 1 0 0 0 1 0 0 1 0 1 1 0 0 0
Sector Protection
01H 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
(B) – Byte mode
(W) – Word mode
8/18/97
Am29F800T/Am29F800B
9
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