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AM29F400AB-90SI データシート(PDF) 8 Page - Advanced Micro Devices

部品番号 AM29F400AB-90SI
部品情報  4 Megabit (524,288 x 8-Bit/262,144 x 16-Bit) CMOS 5.0 Volt-only, Sector Erase Flash Memory
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メーカー  AMD [Advanced Micro Devices]
ホームページ  http://www.amd.com
Logo AMD - Advanced Micro Devices

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Am29F400AT/Am29F400AB
PRELIMINARY
Table 1.
Am29F400A User Bus Operations (BYTE = VIH)
Table 2.
Am29F400A User Bus Operations (BYTE = VIL)
Legend:
L = logic 0, H = logic 1, X = Don’t Care. See Characteristics for voltage levels.
Notes:
1. Manufacturer and device codes may also be accessed via a command register write sequence. Refer to Table 4.
2. Refer to the section on Sector Protection.
Read Mode
The Am29F400A has two control functions which must
be satisfied in order to obtain data at the outputs. CE is
the power control and should be used for device selec-
tion. OE is the output control and should be used to
gate data to the output pins if a device is selected.
Address access time (tACC) is equal to the delay from
stable addresses to valid output data. The chip enable
access time (tCE) is the delay from stable addresses
and stable CE to valid data at the output pins.
The output enable access time is the delay from the
falling edge of OE to valid data at the output pins (as-
suming the addresses have been stable for at least
tACC-tOE time).
Standby Mode
There are two ways to implement the standby mode on
the Am29F400A device, both using the CE pin.
A CMOS standby mode is achieved with the CE input
held at VCC ± 0.5 V. Under this condition the current is
typically reduced to less than 5
µA. A TTL standby
mode is achieved with the CE pin held at VIH. Under
this condition the current is typically reduced to 1 mA.
In the standby mode the outputs are in the high imped-
ance state, independent of the OE input.
Operation
CE
OE
WE
A0
A1
A6
A9
DQ0–DQ15
RESET
Autoselect, AMD Manuf. Code (Note 1)
L
L
H
L
L
L
VID
Code
H
Autoselect Device Code (Note 1)
L
L
H
H
L
L
VID
Code
H
Read
L
L
H
A0
A1
A6
A9
DOUT
H
Standby
H
XXXXXX
HIGH Z
H
Output Disable
L
H
H
XXXX
HIGH Z
H
Write
L
H
L
A0
A1
A6
A9
DIN
H
Verify Sector Protect (Note 2)
L
LHLHL
VID
Code
H
Temporary Sector Unprotect
XXXXXXX
X
VID
Hardware Reset
XXXXXXX
HIGH Z
L
Operation
CE
OE
WE
A0
A1
A6
A9
DQ0–DQ7 DQ8–DQ15 RESET
Autoselect, AMD Manuf. Code
(Note 1)
LL
H
LLL
VID
Code
HIGH Z
H
Autoselect Device Code (Note 1)
L
L
H
H
L
L
VID
Code
HIGH Z
H
Read
L
L
H
A0
A1
A6
A9
DOUT
HIGH Z
H
Standby
H
XXXXXX
HIGH Z
HIGH Z
H
Output Disable
L
H
H
XXXX
HIGH Z
HIGH Z
H
Write
L
H
L
A0
A1
A6
A9
DIN
HIGH Z
H
Verify Sector Protect (Note 2)
L
LHLHL
VID
Code
HIGH Z
H
Temporary Sector Unprotect
XXXXXXX
X
HIGH Z
VID
Hardware Reset
XXXXXXX
HIGH Z
HIGH Z
L


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