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AM29LV033C-70EI データシート(PDF) 11 Page - Advanced Micro Devices

部品番号 AM29LV033C-70EI
部品情報  32 Megabit (4 M x 8-Bit) CMOS 3.0 Volt-only Uniform Sector 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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22268B5 September 12, 2006
Am29LV033C
9
DA TA
SH EET
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-
tion. The register is composed of latches that store the
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.
Am29LV033C Device Bus Operations
Legend:
L = Logic Low = V
IL, H = Logic High = VIH, VID = 12.0 ± 0.5 V, X = Don’t Care, AIN = Address In, DIN = Data In, DOUT = Data Out
Notes:
1. When the ACC pin is at V
HH, the device enters the accelerated program mode. See “Accelerated Program Operations” on
page 22 for more information.
2.
The sector protect and sector unprotect functions may also be implemented via programming equipment. See the “Sector/Sector
Block Protection and Unprotection” on page 15 section.
Requirements for Reading Array Data
To read array data from the outputs, the system must
drive the CE# and OE# pins to VIL. 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 VIH.
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
addresses on the device address inputs produce valid
data on the device data outputs. The device remains
enabled for read access until the command register
contents are altered.
See “Reading Array Data” on page 21 for more infor-
mation. Refer to the AC Read Operations table for tim-
ing specifications and to Figure 13, on page 34 for the
timing diagram. ICC1 in the DC Characteristics table
represents the active current specification for reading
array data.
Writing Commands/Command Sequences
To write a command or command sequence (which in-
cludes programming data to the device and erasing
sectors of memory), the system must drive WE# and
CE# to VIL, and OE# to VIH.
The device features an Unlock Bypass mode to facili-
tate faster programming. Once the device enters the
Unlock Bypass mode, only two write cycles are re-
quired to program a byte, instead of four. The “Byte
Program Command Sequence” on page 21 section
has details on programming data to the device using
both standard and Unlock Bypass command se-
quences.
Operation
CE#
OE#
WE#
RESET#
Addresses
DQ0–DQ7
Read
L
L
H
H
A
IN
D
OUT
Write (Note 1)
L
H
L
H
A
IN
D
IN
Standby
V
CC ±
0.3 V
XX
V
CC ±
0.3 V
X
High-Z
Output Disable
L
H
H
H
X
High-Z
Reset
X
X
X
L
X
High-Z
Sector/Sector Block Protect
(Note 2)
LH
L
V
ID
Sector Addresses,
A6 = L, A1 = H, A0 = L
D
IN, DOUT
Sector/Sector Block Unprotect
(Note 2)
LH
L
V
ID
Sector Addresses
A6 = H, A1 = H, A0 = L
D
IN, DOUT
Temporary Sector/Sector Block
Unprotect
XX
X
V
ID
A
IN
D
IN


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