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| 型号： | AM29DS322B90EI |
| 厂商： | Spansion Inc. |
| 英文描述： | 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 1.8 Volt-only, Simultaneous Operation Flash Memory |
| 中文描述： | 32兆位（4个M × 8位/ 2米x 16位），1.8伏的CMOS只，同时作业快闪记忆体 |
| 文件页数： | 9/52页 |
| 文件大小： | 604K |
| 代理商： | AM29DS322B90EI |
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8
Am29DS32xG
May 15, 2002
A D V A N C E I N F O R M A T I O N
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 a latch used to store the com-
mands, along with the address and data information
needed to execute the command. The contents of the
register serve as inputs to the internal state machine.
The state machine outputs dictate the function of the
device. Table 1 lists the device bus operations, the in-
puts and control levels they require, and the resulting
output. The following subsections describe each of
these operations in further detail.
Table 1.
Device Bus Operations
Legend:
L = Logic Low = V
IL
, H = Logic High = V
IH
, V
ID
= 9.0–11.0 V, V
HH
= 9.0 ± 0.5 V, X = Don’t Care, SA = Sector Address,
A
IN
= Address In, D
IN
= Data In, D
OUT
= Data Out
Notes:
1. Addresses are A20:A0 in word mode (BYTE# = V
IH
), A20:A-1 in byte mode (BYTE# = V
IL
).
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
, the two outermost boot sectors remain protected. If WP#/ACC = V
IH
, the two outermost boot sector
protection 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, DQ15–DQ0 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 DQ7–DQ0 are
active and controlled by CE# and OE#. The data I/O
pins DQ14–DQ8 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 determines
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)
DQ15–DQ8
DQ7–
DQ0
BYTE#
= V
IH
BYTE#
= V
IL
Read
L
L
H
H
L/H
A
IN
D
OUT
DQ14–DQ8 =
High-Z, DQ15 = A-1
D
OUT
Write
L
H
L
H
(Note 3)
A
IN
D
IN
D
IN
Standby
V
CC
±
0.3 V
X
X
V
CC
±
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
V
ID
L/H
SA, A6 = L,
A1 = H, A0 = L
X
X
D
IN
Sector Unprotect (Note 2)
L
H
L
V
ID
(Note 3)
SA, A6 = H,
A1 = H, A0 = L
X
X
D
IN
Temporary Sector
Unprotect
X
X
X
V
ID
(Note 3)
A
IN
D
IN
High-Z
D
IN
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