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| 型號： | AM29LV001BT-70JI |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | PROM |
| 英文描述： | 1 Megabit (128 K x 8-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory |
| 中文描述： | 128K X 8 FLASH 3V PROM, 70 ns, PQCC32 |
| 封裝： | MO-052A, PLASTIC, LCC-32 |
| 文件頁數(shù)： | 15/43頁 |
| 文件大小： | 493K |
| 代理商： | AM29LV001BT-70JI |
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May 5, 2006 21557F4
Am29LV001B
13
D A T A S H E E T
COMMAND DEFINITIONS
Writing specific address and data commands or
sequences into the command register initiates device
operations.
Table 5 on page 17
defines the valid reg-
ister command sequences.
Note that writing incorrect
address and data values or writing them in the
improper sequence may place the device in an
unknown state. A reset command is required to return
the device to reading array data
.
All addresses are latched on the falling edge of WE# or
CE#, whichever happens later. All data is latched on
the rising edge of WE# or CE#, whichever happens
first. Refer to the appropriate timing diagrams in
“AC
Characteristics” on page 26
.
Reading Array Data
The device is automatically set to reading array data
after device power-up. No commands are required to
retrieve data. The device is also ready to read array
data after completing an Embedded Program or
Embedded Erase algorithm.
After the device accepts an Erase Suspend command,
the device enters the Erase Suspend mode. The
system can read array data using the standard read
timings, except that if it reads at an address within
erase-suspended sectors, the device outputs status
data. After completing a programming operation in the
Erase Suspend mode, the system may once again
read array data with the same exception. See
“Erase
Suspend/Erase Resume Commands” on page 15
for
more information on this mode.
The system
must
issue the reset command to re-
enable the device for reading array data if DQ5 goes
high, or while in the autoselect mode. See the
“Reset
Command” on page 13
section.
See also
“Requirements for Reading Array Data” on
page 7
for more information. The Read Operations
table provides the read parameters, and
Figure 13, on
page 26
shows the timing diagram.
Reset Command
Writing the reset command to the device resets the
device to reading array data. Address bits are don’t
care for this command.
The reset command may be written between the
sequence cycles in an erase command sequence
before erasing begins. This resets the device to reading
array data. Once erasure begins, however, the device
ignores reset commands until the operation is
complete.
The reset command may be written between the
sequence cycles in a program command sequence
before programming begins. This resets the device to
reading array data (also applies to programming in
Erase Suspend mode). Once programming begins,
however, the device ignores reset commands until the
operation is complete.
The reset command may be written between the
sequence cycles in an autoselect command sequence.
Once in the autoselect mode, the reset command
must
be written to return to reading array data (also applies
to autoselect during Erase Suspend).
If DQ5 goes high during a program or erase operation,
writing the reset command returns the device to
reading array data (also applies during Erase
Suspend).
See
“AC Characteristics” on page 26
for parameters,
and
Figure 14, on page 27
for the timing diagram.
Autoselect Command Sequence
The autoselect command sequence allows the host
system to access the manufacturer and devices codes,
and determine whether or not a sector is protected.
Table 5 on page 17
shows the address and data
requirements. This method is an alternative to that
shown in
Table 4 on page 10
, which is intended for
PROM programmers and requires VID on address bit
A9.
The autoselect command sequence is initiated by
writing two unlock cycles, followed by the autoselect
command. The device then enters the autoselect
mode, and the system may read at any address any
number of times, without initiating another command
sequence. A read cycle at address XX00h retrieves the
manufacturer code. A read cycle at address XX01h
returns the device code. A read cycle containing a
sector address (SA) and the address 02h returns 01h if
that sector is protected, or 00h if it is unprotected. Refer
to
Table 2 on page 9
for valid sector addresses.
The system must write the reset command to exit the
autoselect mode and return to reading array data.
Byte Program Command Sequence
The device programs one byte of data for each program
operation. The command sequence requires four bus
cycles, and is initiated by writing two unlock write
cycles, followed by the program set-up command. The
program address and data are written next, which in
turn initiate the Embedded Program algorithm. The
system is not required to provide further controls or tim-
ings. The device automatically provides internally
generated program pulses and verify the programmed
cell margin.
Table 5 on page 17
shows the address and
data requirements for the byte program command
sequence.
When the Embedded Program algorithm is complete,
the device then returns to reading array data and
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