Features
•
Low Voltage Operation
•
•
•
– 2.7V Read
– 5V Program/Erase
Fast Read Access Time - 120 ns
Internal Erase/Program Control
Sector Architecture
– One 8K Words (16K bytes) Boot Block with Programming Lockout
– Two 8K Words (16K bytes) Parameter Blocks
– One 488K Words (976K bytes) Main Memory Array Block
Fast Sector Erase Time - 10 seconds
Word-By-Word Programming - 30
µs/Word
Hardware Data Protection
DATA Polling For End Of Program Detection
Low Power Dissipation
– 25 mA Active Current
– 50
µA
CMOS Standby Current
Typical 10,000 Write Cycles
•
•
•
•
•
•
8-Megabit
(512K x 16)
CMOS Flash
Memory
AT49BV8192
AT49BV8192T
AT49LV8192
AT49LV8192T
Description
The AT49BV8192 and AT49LV8192 are 3-volt, 8-megabit Flash Memories organized
as 512K words of 16 bits each. Manufactured with Atmel’s advanced nonvolatile
CMOS technology, the devices offer access times to 120 ns with power dissipation of
just 67 mW at 2.7V read. When deselected, the CMOS standby current is less than 50
µA.
(continued)
Pin Configurations
Pin Name
A0 - A18
CE
OE
WE
RESET
V
PP
I/O0 - I/O15
NC
Function
Addresses
Chip Enable
Output Enable
Write Enable
Reset
Program/Erase Power
Supply
Data
Inputs/Outputs
No Connect
TSOP Top View
Type 1
A15
A13
A11
A9
A14
A12
A10
4
6
8
10
12
14
16
18
20
22
24
1
3
5
7
9
11
13
15
17
19
21
23
2
48
46
44
42
40
38
36
34
32
30
28
26
25
47
45
43
41
39
37
35
33
31
29
27
NC
I/O15
I/O14
I/O13
I/O12
VCC
I/O3
I/O2
I/O1
I/O0
GND
A0
CE
A16
GND
I/O7
I/O6
I/O5
I/O4
I/O11
I/O10
I/O9
I/O8
OE
SOIC (SOP)
VPP
A18
A17
A7
A6
A5
A4
A3
A2
A1
A0
CE
GND
OE
I/O0
I/O8
I/O1
I/O9
I/O2
I/O10
I/O3
I/O11
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
RESET
WE
A8
A9
A10
A11
A12
A13
A14
A15
A16
NC
GND
I/O15
I/O7
I/O14
I/O6
I/O13
I/O5
I/O12
I/O4
VCC
A8
NC
NC
WE
RESET
VPP NC
NC
A18
A17
A7
A6
A5
A4
A3
A2
A1
0978B-A–11/97
1
The device contains a user-enabled “boot block” protection
feature. Two versions of the feature are available: the
AT49BV/LV8192 locates the boot block at lowest order
addresses (“bottom boot”); the AT49BV/LV8192T locates it
at highest order addresses (“top boot”)
To allow for simple in-system reprogrammability, the
AT49BV/LV8192 does not require high input voltages for
programming. Reading data out of the device is similar to
reading from an EPROM; it has standard CE, OE, and WE
inputs to avoid bus contention. Reprogramming the
AT49BV/LV8192 is performed by first erasing a block of
data and then programming on a word-by-word basis.
The device is erased by executing the erase command
sequence; the device internally controls the erase opera-
tion. The memory is divided into three blocks for erase
operations. There are two 8K word parameter block sec-
tions and one sector consisting of the boot block and the
main memory array block. The AT49BV/LV8192 is pro-
grammed on a word-by-word basis.
The device has the capability to protect the data in the boot
block; this feature is enabled by a command sequence.
Once the boot block programming lockout feature is
enabled, the data in the boot block cannot be changed
when input levels of 3.6 volts or less are used. The typical
number of program and erase cycles is in excess of 10,000
cycles.
The optional 8K word boot block section includes a repro-
gramming lock out feature to provide data integrity. The
boot sector is designed to contain user secure code, and
when the feature is enabled, the boot sector is protected
from being reprogrammed.
During a chip erase, sector erase, or word programming,
the V
PP
pin must be at 5V
±
10%.
Block Diagram
AT49BV/LV8192
AT49BV/LV8192T
V
CC
V
PP
GND
OE
WE
CE
RESET
ADDRESS
INPUTS
DATA INPUTS/OUTPUTS
I/O0 - I/O15
DATA INPUTS/OUTPUTS
I/O0 - I/O15
CONTROL
LOGIC
INPUT/OUTPUT
BUFFERS
PROGRAM DATA
LATCHES
Y-GATING
MAIN MEMORY
(488K WORDS)
PARAMETER
BLOCK 2
8K WORDS
PARAMETER
BLOCK 1
8K WORDS
BOOT BLOCK
8K WORDS
INPUT/OUTPUT
BUFFERS
PROGRAM DATA
LATCHES
Y-GATING
Y DECODER
X DECODER
7FFFF
06000
05FFF
04000
03FFF
02000
01FFF
00000
BOOT BLOCK
8K WORDS
PARAMETER
BLOCK 1
8K WORDS
PARAMETER
BLOCK 2
8K WORDS
MAIN MEMORY
(488K WORDS)
7FFFF
7E000
7DFFF
7C000
7BFFF
7A000
79FFF
00000
Device Operation
READ:
The AT49BV/LV8192 is accessed like an EPROM.
When CE and OE are low and WE is high, the data stored
at the memory location determined by the address pins is
asserted on the outputs. The outputs are put in the high
impedance state whenever CE or OE is high. This dual-line
control gives designers flexibility in preventing bus conten-
tion.
COMMAND SEQUENCES:
When the device is first pow-
ered on it will be reset to the read or standby mode
depending upon the state of the control line inputs. In order
to perform other device functions, a series of command
sequences are entered into the device. The command
sequences are shown in the Command Definitions table
(I/O8 - I/O15 are don't care inputs for the command codes).
The command sequences are written by applying a low
2
pulse on the WE or CE input with CE or WE low (respec-
tively) and OE high. The address is latched on the falling
edge of CE or WE, whichever occurs last. The data is
latched by the first rising edge of CE or WE. Standard
microprocessor write timings are used. The address loca-
tions used in the command sequences are not affected by
entering the command sequences.
RESET:
A RESET input pin is provided to ease some sys-
tem applications. When RESET is at a logic high level, the
device is in its standard operating mode. A low level on the
RESET input halts the present device operation and puts
the outputs of the device in a high impedance state. When
a high level is reasserted on the RESET pin, the device
returns to the Read or Standby mode, depending upon the
state of the control inputs. By applying a 12V
±
0.5V input
AT49BV/LV8192(T)
AT49BV/LV8192(T)
signal to the RESET pin the boot block array can be repro-
grammed even if the boot block program lockout feature
has been enabled (see Boot Block Programming Lockout
Override section).
ERASURE:
Before a word can be reprogrammed, it must
be erased. The erased state of memory bits is a logical “1”.
The entire device can be erased by using the Chip Erase
command or individual sectors can be erased by using the
Sector Erase commands.
CHIP ERASE:
The entire device can be erased at one
time by using the 6-byte chip erase software code. After the
chip erase has been initiated, the device will internally time
the erase operation so that no external clocks are required.
The maximum time to erease the chip is t
EC
.
If the boot block lockout has been enabled, the Chip Erase
will not erase the data in the boot block; it will erase the
main memory block and the parameter blocks only. After
the chip erase, the device will return to the read or standby
mode.
SECTOR ERASE:
As an alternative to a full chip erase,
the device is organized into three sectors that can be indi-
vidually erased. There are two 8K word parameter block
sections and one sector consisting of the boot block and
the main memory array block. The Sector Erase command
is a six bus cycle operation. The sector address is latched
on the falling WE edge of the sixth cycle while the 30H data
input command is latched at the rising edge of WE. The
sector erase starts after the rising edge of WE of the sixth
cycle. The erase operation is internally controlled; it will
automatically time to completion. When the boot block pro-
gramming lockout feature is not enabled, the boot block
and the main memory block will erase together (from the
same sector erase command). Once the boot region has
been protected, only the main memory array sector will
erase when its sector erase command is issued.
WORD PROGRAMMING:
Once a memory block is
erased, it is programmed (to a logical “0”) on a word-by-
word basis. Programming is accomplished via the internal
device command register and is a 4 bus cycle operation.
The device will automatically generate the required internal
program pulses.
Any commands written to the chip during the embedded
programming cycle will be ignored. If a hardware reset hap-
pens during programming, the data at the location being
programmed will be corrupted. Please note that a data “0”
cannot be programmed back to a “1”; only erase operations
can convert “0”s to “1”s. Programming is completed after
the specified t
BP
cycle time. The DATA polling feature may
also be used to indicate the end of a program cycle.
BOOT BLOCK PROGRAMMING LOCKOUT:
The device
has one designated block that has a programming lockout
feature. This feature prevents programming of data in the
designated block once the feature has been enabled. The
size of the block is 8K words. This block, referred to as the
boot block, can contain secure code that is used to bring up
the system. Enabling the lockout feature will allow the boot
code to stay in the device while data in the rest of the
device is updated. This feature does not have to be acti-
vated; the boot block’s usage as a write protected region is
optional to the user. The address range of the
49BV/LV8192 boot block is 00000H to 01FFFH while the
address range of the 49BV/LV8192T is 7E000H to
7FFFFH.
Once the feature is enabled, the data in the boot block can
no longer be erased or programmed when input levels of
5.5V or less are used. Data in the main memory block can
still be changed through the regular programming method.
To activate the lockout feature, a series of six program
commands to specific addresses with specific data must be
performed. Please refer to the Command Definitions table.
BOOT BLOCK LOCKOUT DETECTION:
A software
method is available to determine if programming of the boot
block section is locked out. When the device is in the soft-
ware product identification mode (see Software Product
Identification Entry and Exit sections) a read from address
location 00002H will show if programming the boot block is
locked out. If the data on I/O0 is low, the boot block can be
programmed; if the data on I/O0 is high, the program lock-
out feature has been enabled and the block cannot be pro-
grammed. The software product identification exit code
should be used to return to standard operation.
BOOT BLOCK PROGRAMMING LOCKOUT OVER-
RIDE:
The user can override the boot block programming
lockout by taking the RESET pin to 12 volts during the
entire chip erase, sector erase or word programming oper-
ation. When the RESET pin is brought back to TTL levels
the boot block programming lockout feature is again active.
PRODUCT IDENTIFICATION:
The product identification
mode identifies the device and manufacturer as Atmel. It
may be accessed by hardware or software operation. The
hardware operation mode can be used by an external pro-
grammer to identify the correct programming algorithm for
the Atmel product.
For details, see Operating Modes (for hardware operation)
or Software Product Identification. The manufacturer and
device code is the same for both modes.
DATA POLLING:
The AT49BV/LV8192 features DATA
polling to indicate the end of a program cycle. During a pro-
gram cycle an attempted read of the last byte loaded will
result in the complement of the loaded data on I/O7. Once
the program cycle has been completed, true data is valid
on all outputs and the next cycle may begin. During a chip
or sector erase operation, an attempt to read the device will
give a “0” on I/O7. Once the program or erase cycle has
completed, true data will be read from the device. DATA
polling may begin at any time during the program cycle.
3
TOGGLE BIT:
In addition to DATA polling the
AT49BV/LV8192 provides another method for determining
the end of a program or erase cycle. During a program or
erase operation, successive attempts to read data from the
device will result in I/O6 toggling between one and zero.
Once the program cycle has completed, I/O6 will stop tog-
gling and valid data will be read. Examining the toggle bit
may begin at any time during a program cycle.
HARDWARE DATA PROTECTION:
Hardware features
protect against inadvertent programs to the
AT49BV/LV8192 in the following ways: (a) V
CC
sense: if
V
CC
is below 1.8V (typical), the program function is inhib-
ited. (b) V
CC
power on delay: once V
CC
has reached the
V
CC
sense level, the device will automatically time out 10
ms (typical) before programming. (c) Program inhibit: hold-
ing any one of OE low, CE high or WE high inhibits pro-
gram cycles. (d) Noise filter: pulses of less than 15 ns (typi-
cal) on the WE or CE inputs will not initiate a program
cycle.
INPUT LEVELS:
While operating with a 2.7V to 3.6V
power supply, the address inputs and control inputs (OE,
CE, and WE) may be driven from 0 to 5.5V without
adversely affecting the operation of the device. The I/O
lines can only be driven from 0 to V
CC
+ 0.6V.
4
AT49BV/LV8192(T)
AT49BV/LV8192(T)
Command Definition (in Hex)
(1)
Command
Sequence
Read
Chip Erase
Sector Erase
Word Program
Boot Block Lockout
(2)
Product ID Entry
Product ID Exit
(3)
Bus
Cycles
1
6
6
4
6
3
3
1st Bus
Cycle
Addr
Addr
5555
5555
5555
5555
5555
5555
Data
D
OUT
AA
AA
AA
AA
AA
AA
2AAA
2AAA
2AAA
2AAA
2AAA
2AAA
55
55
55
55
55
55
5555
5555
5555
5555
5555
5555
80
80
A0
80
90
F0
5555
5555
Addr
5555
AA
AA
D
IN
AA
2AAA
55
5555
40
2AAA
2AAA
55
55
5555
SA
(4)(5)
10
30
2nd Bus
Cycle
Addr
Data
3rd Bus
Cycle
Addr
Data
4th Bus
Cycle
Addr
Data
5th Bus
Cycle
Addr
Data
6th Bus
Cycle
Addr
Data
Product ID Exit
(3)
1
xxxx
F0
Notes: 1. The DATA FORMAT in each bus cycle is as follows: I/O15 - I/O8 (Don’t Care); I/O7 - I/O0 (Hex)
2. The 8K word boot sector has the address range 00000H to 01FFFH for the AT49BV/LV8192 and 7E000H to 7FFFFH for the
AT49BV/LV8192T.
3. Either one of the Product ID Exit commands can be used.
4. SA = sector addresses:
For the AT49BV/LV8192
SA = 03XXX for PARAMETER BLOCK 1
SA = 05XXX for PARAMETER BLOCK 2
SA = 7FXXX for MAIN MEMORY ARRAY
For the AT49BV/LV8192T
SA = 7DXXX for PARAMETER BLOCK 1
SA = 7BXXX for PARAMETER BLOCK 2
SA = 79XXX for MAIN MEMORY ARRAY
5. When the boot block programming lockout feature is not enabled, the boot block and the main memory block will erase
together (form the same sector erase command). Once the boot region has been protected, only the main memory array
sector will erase when its sector erase command is issued.
Absolute Maximum Ratings*
Temperature Under Bias ................................ -55°C to +125°C
Storage Temperature ..................................... -65°C to +150°C
All Input Voltages
(including NC Pins)
with Respect to Ground ...................................-0.6V to +6.25V
All Output Voltages
with Respect to Ground .............................-0.6V to V
CC
+ 0.6V
Voltage on RESET
with Respect to Ground ...................................-0.6V to +13.5V
*NOTICE:
Stresses beyond those listed under “Absolute
Maximum Ratings” may cause permanent dam-
age to the device. This is a stress rating only and
functional operation of the device at these or any
other conditions beyond those indicated in the
operational sections of this specification is not
implied. Exposure to absolute maximum rating
conditions for extended periods may affect device
reliability.
5
Microcontroller MCU
京公网安备 11010802033920号
EEWORLD
