AM29LV160 AMD [Advanced Micro Devices], AM29LV160 Datasheet - Page 9

• Manufacturer Part Number: AM29LV160
• Description: 16 Megabit (2 M x 8-Bit/1 M x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory
• Manufacturer: AMD [Advanced Micro Devices]

Read
Write
Standby
Output Disable
Reset
Sector Protect (Note 2)
Sector Unprotect (Note 2)
Temporary Sector
Unprotect
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 it-
self 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
Legend:
L = Logic Low = V
Notes:
1. Addresses are A19:A0 in word mode (BYTE# = V
2. The sector protect and sector unprotect functions may also be implemented via programming equipment. See the “Sector
Word/Byte Configuration
The BYTE# pin controls whether the device data I/O
pins DQ15–DQ0 operate in the byte or word configura-
tion. If the BYTE# pin is set at logic ‘1’, the device is in
word configuration, DQ15–DQ0 are active and con-
trolled 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 ac-
tive 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
control and selects the device. OE# is the output control
and gates array data to the output pins. WE# should re-
8
Protection/Unprotection” section.
Operation
IL
, H = Logic High = V
V
0.3 V
CE#
CC
L
L
L
X
L
L
X
Table 1. Am29LV160B Device Bus Operations
IL
OE# WE# RESET#
H
X
H
X
H
H
X
. CE# is the power
L
IH
, V
ID
H
X
H
X
X
L
L
L
= 12.0
V
0.3 V
IH
V
V
V
CC
H
H
H
L
), A19:A-1 in byte mode (BYTE# = V
ID
ID
ID
0.5 V, X = Don’t Care, A
Am29LV160B
Sector Address,
Sector Address,
A6 = H, A1 = H,
A6 = L, A1 = H,
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 resulting
output. The following subsections describe each of
these operations in further detail.
main at V
vice 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 mem-
ory content occurs during the power transition. No
command is necessary in this mode to obtain array
data. Standard microprocessor read cycles that as-
sert valid addresses on the device address inputs pro-
duce 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” for more information. Refer
to the AC Read Operations table for timing specifica-
tions and to Figure 13 for the timing diagram. I
the DC Characteristics table represents the active cur-
rent specification for reading array data.
Addresses
(Note 1)
A0 = L
A0 = L
A
A
A
X
X
X
IN
IN
IN
IH
. The BYTE# pin determines whether the de-
IN
= Address In, D
High-Z
High-Z
High-Z
DQ0–
D
DQ7
D
D
D
D
OUT
IN
IN
IN
IN
IL
).
BYTE#
High-Z
High-Z
High-Z
= V
D
IN
D
D
OUT
X
X
IN
IN
= Data In, D
IH
DQ8–DQ14 = High-Z,
DQ8–DQ15
DQ15 = A-1
OUT
BYTE#
High-Z
High-Z
High-Z
High-Z
= V
X
X
= Data Out
IL
CC1
in