AM29F800T-70SCB データシートの表示（PDF） - Advanced Micro Devices
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AM29F800T-70SCB
Advanced Micro Devices
AM29F800T-70SCB Datasheet PDF : 41 Pages
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PRELIMINARY
Operation
Table 1. Am29F800 User Bus Operations (BYTE = VIH)
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
X
A0
A1
A6
A9
DOUT
H
Standby
H
X
X
X
X
X
X
HIGH Z
H
Output Disable
Write
Verify Sector Protect (Note 2)
Temporary Sector Unprotect
Hardware Reset
L
H
H
X
X
X
X
HIGH Z
H
L
H
L
A0
A1
A6
A9
DIN
H
L
L
H
L
H
L
VID
Code
H
X
X
X
X
X
X
X
X
VID
X
X
X
X
X
X
X
HIGH Z
L
Table 2. Am29F800 User Bus Operations (BYTE = VIL)
Operation
CE OE WE A0 A1 A6 A9 DQ0–DQ7 DQ8–DQ15 RESET
Autoselect, AMD Manuf. Code
(Note 1)
L
L
H
L
L
L
VID
Code
HIGH Z
H
Autoselect Device Code (Note 1) L
L
H
H
L
L
VID
Code
HIGH Z
H
Read
L
L
X
A0 A1 A6 A9
DOUT
HIGH Z
H
Standby
H
X
X
X
X
X
X
HIGH Z
HIGH Z
H
Output Disable
L
H
H
X
X
X
X
HIGH Z
HIGH Z
H
Write
Verify
Sector Protect (Note 2)
L
H
L
A0 A1 A6 A9
DIN
HIGH Z
H
L
L
H
L
H
L
VID
Code
HIGH Z
H
Temporary
Sector Unprotect
X
X
X
X
X
X
X
X
HIGH Z
VID
Hardware Reset
X
X
X
X
X
X
X
HIGH Z
HIGH Z
L
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 7.
2. Refer to the section on Sector Protection.
Read Mode
The Am29F800 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 (assuming the addresses have been stable for at
least tACC–tOE time).
Standby Mode
There are two ways to implement the standby mode on
the Am29F800 device, both using the CE pin.
A CMOS standby mode is achieved with the CE input
held at VCC ± 0.3V. 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.
8
Am29F800T/Am29F800B
8/18/97
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