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AM29DL640D120EIN bảng dữ liệu(PDF) 9 Page - Advanced Micro Devices

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Giải thích chi tiết về linh kiện  64 Megabit CMOS 3.0 Volt-only, Simultaneous Read/Write Flash Memory
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Am29DL640D
October 7, 2004
DEVICE BUS OPERATIONS
This section describes the requirements and use of
the device bus operations, which are initiated through
the internal command register. The command register
itself does not occupy any addressable memory loca-
ti on . T h e re gi s t er is a la tc h u s ed to s t ore th e
commands, along with the address and data informa-
tion needed to execute the command. The contents of
the register serve as inputs to the internal state ma-
chine. The state machine outputs dictate the function
of the device. Table 1 lists the device bus operations,
the inputs and control levels they require, and the re-
sulting output. The following subsections describe
each of these operations in further detail.
Table 1.
Am29DL640D Device Bus Operations
Legend: L = Logic Low = V
IL, H = Logic High = VIH, VID = 8.5–12.5 V, VHH = 9.0 ± 0.5 V, X = Don’t Care, SA = Sector Address,
A
IN = Address In, DIN = Data In, DOUT = Data Out
Notes:
1. Addresses are A21:A0 in word mode (BYTE# = V
IH), A21:A-1 in byte mode (BYTE# = VIL).
2. The sector protect and sector unprotect functions may also be implemented via programming equipment. See the “Sector/Sector
Block Protection and Unprotection” section.
3. If WP#/ACC = V
IL, sectors 0, 1, 140, and 141 remain protected. If WP#/ACC = VIH, protection on sectors 0, 1, 140, and 141
depends on whether they were last protected or unprotected using the method described in “Sector/Sector Block Protection
and Unprotection”. If WP#/ACC = V
HH, all sectors will be unprotected.
Word/Byte Configuration
The BYTE# pin controls whether the device data I/O
pins operate in the byte or word configuration. If the
BYTE# pin is set at logic ‘1’, the device is in word con-
figuration, DQ0–DQ15 are active and controlled by
CE# and OE#.
If the BYTE# pin is set at logic ‘0’, the device is in byte
configuration, and only data I/O pins DQ0–DQ7 are
active and controlled by CE# and OE#. The data I/O
pins DQ8–DQ14 are tri-stated, and the DQ15 pin is
used as an input for the LSB (A-1) address function.
Requirements for Reading Array Data
To read array data from the outputs, the system must
drive the CE# and OE# pins to V
IL. CE# is the power
control and selects the device. OE# is the output con-
trol and gates array data to the output pins. WE#
should remain at V
IH . The BYTE# pin deter m ines
whether the device outputs array data in words or
bytes.
The internal state machine is set for reading array data
upon device power-up, or after a hardware reset. This
ensures that no spurious alteration of the memory
content occurs during the power transition. No com-
mand is necessary in this mode to obtain array data.
Standard microprocessor read cycles that assert valid
Operation
CE#
OE#
WE#
RESET#
WP#/ACC
Addresses
(Note 2)
DQ0–
DQ7
DQ8–DQ15
BYTE#
= V
IH
BYTE#
= V
IL
Read
L
L
H
H
L/H
AIN
DOUT
DOUT
DQ8–DQ14 =
High-Z, DQ15 = A-1
Write
L
H
L
H
(Note 3)
A
IN
D
IN
D
IN
Standby
VCC ±
0.3 V
XX
VCC ±
0.3 V
H
X
High-Z
High-Z
High-Z
Output Disable
L
H
H
H
L/H
X
High-Z
High-Z
High-Z
Reset
X
X
X
L
L/H
X
High-Z
High-Z
High-Z
Sector Protect (Note 2)
L
H
L
VID
L/H
SA, A6 = L,
A1 = H, A0 = L
DIN
XX
Sector Unprotect (Note 2)
L
H
L
VID
(Note 3)
SA, A6 = H,
A1 = H, A0 = L
DIN
XX
Temporary Sector
Unprotect
XX
X
VID
(Note 3)
AIN
DIN
DIN
High-Z


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