ATMEL AT45

AT45D041
Features
• Single 4.5V - 5.5V Supply
• Serial Interface Architecture
• Page Program Operation
•
•
•
•
•
•
•
•
•
•
- Single Cycle Reprogram (Erase and Program)
- 2048 Pages (264 Bytes/Page) Main Memory
Two 264-Byte Data Buffers - Allows Receiving of Data while Reprogramming of
Non-Volatile Memory
Internal Program and Control Timer
Fast Page Program Time - 7 ms Typical
80 µs Typical Page to Buffer Transfer Time
Low Power Dissipation
- 15 mA Active Read Current Typical
- 20 µA CMOS Standby Current Typical
10 MHz Max Clock Frequency
Hardware Data Protection Feature
Serial Peripheral Interface (SPI) Compatible – Modes 0 and 3
CMOS and TTL Compatible Inputs and Outputs
Commercial and Industrial Temperature Ranges
Description
The AT45D041 is a 5-volt only, serial interface Flash memory suitable for in-system
reprogramming. Its 4,325,376 bits of memory are organized as 2048 pages of 264bytes each. In addition to the main memory, the AT45D041 also contains two data
buffers of 264-bytes each. The buffers allow receiving of data while a page in the main
memory is being reprogrammed. Unlike conventional Flash memories that are
accessed randomly with multiple address lines and a parallel interface, the DataFlash
uses a serial interface to sequentially access its data. The simple serial interface facilitates hardware layout, increases system reliability, minimizes switching noise, and
(continued)
Pin Configurations
SCK
Serial Clock
SI
Serial Input
SO
Serial Output
WP
Hardware Page Write
Protect Pin
RESET
Chip Reset
RDY/BUSY
Ready/Busy
CS
NC
NC
GND
VCC
NC
NC
Chip Select
SCK
SI
SO
NC
NC
NC
NC
NC
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
5
6
7
8
9
10
11
12
13
29
28
27
26
25
24
23
22
21
WP
RESET
RDY/BUSY
NC
NC
NC
NC
NC
NC
Note: PLCC package pins 16
and 17 are DON’T CONNECT.
TSOP Top View
Type 1
RDY/BUSY
RESET
WP
NC
NC
VCC
GND
NC
NC
NC
CS
SCK
SI
SO
4
3
2
1
32
31
30
CS
PLCC
14
15
16
17
18
19
20
Function
AT45D041
NC
NC
DC
DC
NC
NC
NC
Pin Name
4-Megabit
5-volt Only
Serial
DataFlash™
SOIC
28
27
26
25
24
23
22
21
20
19
18
17
16
15
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
GND
NC
NC
CS
SCK
SI
SO
NC
NC
NC
NC
NC
NC
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
VCC
NC
NC
WP
RESET
RDY/BUSY
NC
NC
NC
NC
NC
NC
NC
NC
0803C-D–6/97
1
reduces package size and active pin count. The device is
optimized for use in many commercial and industrial applications where high density, low pin count, low voltage, and
low power are essential. Typical applications for the
DataFlash are digital voice storage, image storage, and
data storage. The device operates at clock frequencies up
to 10 Mhz with a typical active read current consumption of
15 mA.
To allow for simple in-system reprogrammability, the
AT45D041 does not require high input voltages for pro-
gramming. The device operates from a single power supply, 4.5V to 5.5V, for both the program and read operations. The AT45D041 is enabled through the chip select pin
(CS) and accessed via a three-wire interface consisting of
the Serial Input (SI), Serial Output (SO), and the Serial
Clock (SCK).
All programming cycles are self-timed, and no separate
erase cycle is required before programming.
Block Diagram
FLASH MEMORY ARRAY
WP
PAGE (264 BYTES)
BUFFER 1 (264 BYTES)
SCK
CS
RESET
VCC
GND
RDY/BUSY
BUFFER 2 (264 BYTES)
I/O INTERFACE
SI
SO
Device Operation
The device operation is controlled by instructions from the
host processor. The list of instructions and their associated
opcodes are contained in Tables 1 and 2. A valid instruction starts with the falling edge of CS followed by the appropriate 8-bit opcode and the desired buffer or main memory
address location. While the CS pin is low, toggling the SCK
pin controls the loading of the opcode and the desired
buffer or main memory address location through the SI
(serial input) pin. All instructions, addresses, and data are
transferred with the most significant bit (MSB) first.
Read
By specifying the appropriate opcode, data can be read
from the main memory or from either one of the two data
buffers.
MAIN MEMORY PAGE READ: A main memory read allows
the user to read data directly from any one of the 2048
pages in the main memory, bypassing both of the data buffers and leaving the contents of the buffers unchanged. To
start a page read, the 8-bit opcode, 52H, is followed by 24
2
AT45D041
address bits and 32 don’t care bits. In the AT45D041, the
first four address bits are reserved for larger density
devices (see Notes on page 7), the next 11 address bits
(PA10-PA0) specify the page address, and the next nine
address bits (BA8-BA0) specify the starting byte address
within the page. The 32 don’t care bits which follow the 24
address bits are sent to initialize the read operation. Following the 32 don’t care bits, additional pulses on SCK
result in serial data being output on the SO (serial output)
pin. The CS pin must remain low during the loading of the
opcode, the address bits, and the reading of data. When
the end of a page in main memory is reached during a main
memory page read, the device will continue reading at the
beginning of the same page. A low to high transition on the
CS pin will terminate the read operation and tri-state the
SO pin.
BUFFER READ: Data can be read from either one of the
two buffers, using different opcodes to specify which buffer
to read from. An opcode of 54H is used to read data from
buffer 1, and an opcode of 56H is used to read data from
AT45D041
buffer 2. To perform a buffer read, the eight bits of the
opcode must be followed by 15 don’t care bits, nine
address bits, and eight don't care bits. Since the buffer size
is 264-bytes, nine address bits (BFA8-BFA0) are required
to specify the first byte of data to be read from the buffer.
The CS pin must remain low during the loading of the
opcode, the address bits, the don’t care bits, and the reading of data. When the end of a buffer is reached, the device
will continue reading back at the beginning of the buffer. A
low to high transition on the CS pin will terminate the read
operation and tri-state the SO pin.
MAIN MEMORY PAGE TO BUFFER TRANSFER: A page
of data can be transferred from the main memory to either
buffer 1 or buffer 2. An 8-bit opcode, 53H for buffer 1 and
55H for buffer 2, is followed by the four reserved bits, 11
address bits (PA10-PA0) which specify the page in main
memory that is to be transferred, and nine don’t care bits.
The CS pin must be low while toggling the SCK pin to load
the opcode, the address bits, and the don’t care bits from
the SI pin. The transfer of the page of data from the main
memory to the buffer will begin when the CS pin transitions
from a low to a high state. During the transfer of a page of
data (tXFR ), the status register can be read to determine
whether the transfer has been completed or not.
MAIN MEMORY PAGE TO BUFFER COMPARE: A page
of data in main memory can be compared to the data in
buffer 1 or buffer 2. An 8-bit opcode, 60H for buffer 1 and
61H for buffer 2, is followed by 24 address bits consisting of
the four reserved bits, 11 address bits (PA10-PA0) which
specify the page in the main memory that is to be compared to the buffer, and nine don't care bits. The loading of
the opcode and the address bits is the same as described
previously. The CS pin must be low while toggling the SCK
pin to load the opcode, the address bits, and the don't care
bits from the SI pin. On the low to high transition of the CS
pin, the 264 bytes in the selected main memory page will
be compared with the 264 bytes in buffer 1 or buffer 2. During this time (tXFR), the status register will indicate that the
part is busy. On completion of the compare operation, bit 6
of the status register is updated with the result of the compare.
Program
BUFFER WRITE: Data can be shifted in from the SI pin
into either buffer 1 or buffer 2. To load data into either
buffer, an 8-bit opcode, 84H for buffer 1 or 87H for buffer 2,
is followed by 15 don't care bits and nine address bits
(BFA8-BFA0). The nine address bits specify the first byte in
the buffer to be written. The data is entered following the
address bits. If the end of the data buffer is reached, the
device will wrap around back to the beginning of the buffer.
Data will continue to be loaded into the buffer until a low to
high transition is detected on the CS pin.
BUFFER TO MAIN MEMORY PAGE PROGRAM WITH
BUILT-IN ERASE: Data written into either buffer 1 or buffer
2 can be programmed into the main memory. An 8-bit
opcode, 83H for buffer 1 or 86H for buffer 2, is followed by
the four reserved bits, 11 address bits (PA10-PA0) that
specify the page in the main memory to be written, and
nine additional don't care bits. When a low to high transition
occurs on the CS pin, the part will first erase the selected
page in main memory to all 1s and then program the data
stored in the buffer into the specified page in the main
memory. Both the erase and the programming of the page
are internally self timed and should take place in a maximum time of tEP. During this time, the status register will
indicate that the part is busy.
BUFFER TO MAIN MEMORY PAGE PROGRAM WITHOUT BUILT-IN ERASE: A previously erased page within
main memory can be programmed with the contents of
either buffer 1 or buffer 2. An 8-bit opcode, 88H for buffer 1
or 89H for buffer 2, is followed by the four reserved bits, 11
address bits (PA10-PA0) that specify the page in the main
memory to be written, and nine additional don’t care bits.
When a low to high transition occurs on the CS pin, the part
will program the data stored in the buffer into the specified
page in the main memory. It is necessary that the page in
main memory that is being programmed has been previously programmed to all 1s (erased state). The programming of the page is internally self timed and should take
place in a maximum time of tP. During this time, the status
register will indicate that the part is busy.
MAIN MEMORY PAGE PROGRAM: This operation is a
combination of the Buffer Write and Buffer to Main Memory
Page Program with Built-In Erase operations. Data is first
shifted into buffer 1 or buffer 2 from the SI pin and then programmed into a specified page in the main memory. An 8bit opcode, 82H for buffer 1 or 85H for buffer 2, is followed
by the four reserved bits and 20 address bits. The 11 most
significant address bits (PA10-PA0) select the page in the
main memory where data is to be written, and the next nine
address bits (BFA8-BFA0) select the first byte in the buffer
to be written. After all address bits are shifted in, the part
will take data from the SI pin and store it in one of the data
buffers. If the end of the buffer is reached, the device will
wrap around back to the beginning of the buffer. When
there is a low to high transition on the CS pin, the part will
first erase the selected page in main memory to all 1s and
then program the data stored in the buffer into the specified
page in the main memory. Both the erase and the programming of the page are internally self timed and should take
place in a maximum of time tEP. During this time, the status
register will indicate that the part is busy.
AUTO PAGE REWRITE: This mode is only needed if multiple bytes within a page or multiple pages of data are modified in a random fashion. This mode is a combination of two
operations: Main Memory Page to Buffer Transfer and
3
Buffer to Main Memory Page Program with Built-In Erase.
A page of data is first transferred from the main memory to
buffer 1 or buffer 2, and then the same data (from buffer 1
or buffer 2) is programmed back into its original page of
main memory. An 8-bit opcode, 58H for buffer 1 or 59H for
buffer 2, is followed by the four reserved bits, 11 address
bits (PA10-PA0) that specify the page in main memory to
be rewritten, and nine additional don't care bits. When a
low to high transition occurs on the CS pin, the part will first
transfer data from the page in main memory to a buffer and
then program the data from the buffer back into same page
of main memory. The operation is internally self-timed and
should take place in a maximum time of t EP . During this
time, the status register will indicate that the part is busy.
If the main memory is programmed or reprogrammed
sequentially page by page, then the programming algorithm shown in Figure 1 is recommended. Otherwise, if
multiple bytes in a page or several pages are programmed
randomly in the main memory, then the programming algorithm shown in Figure 2 is recommended.
STATUS REGISTER: The status register can be used to
determine the device’s ready/busy status, the result of a
Main Memory Page to Buffer Compare operation, or the
device density. To read the status register, an opcode of
57H must be loaded into the device. After the last bit of the
opcode is shifted in, the eight bits of the status register,
starting with the MSB (bit 7), will be shifted out on the SO
pin during the next eight clock cycles. The five most-significant bits of the status register will contain device information, while the remaining three least-significant bits are
reserved for future use and will have undefined values.
After bit 0 of the status register has been shifted out, the
sequence will repeat itself (as long as CS remains low and
SCK is being toggled) starting again with bit 7. The data in
the status register is constantly updated, so each repeating
sequence will output new data.
Ready/busy status is indicated using bit 7 of the status register. If bit 7 is a 1, then the device is not busy and is ready
to accept the next command. If bit 7 is a 0, then the device
is in a busy state. The user can continuously poll bit 7 of the
status register by stopping SCK once bit 7 has been output.
The status of bit 7 will continue to be output on the SO pin,
and once the device is no longer busy, the state of SO will
change from 0 to 1. There are six operations which can
cause the device to be in a busy state: Main Memory Page
to Buffer Transfer, Main Memory Page to Buffer Compare,
Buffer to Main Memory Page Program with Built-In Erase,
Buffer to Main Memory Page Program without Built-In
Erase, Main Memory Page Program, and Auto Page
Rewrite.
The result of the most recent Main Memory Page to Buffer
Compare operation is indicated using bit 6 of the status
register. If bit 6 is a 0, then the data in the main memory
page matches the data in the buffer. If bit 6 is a 1, then at
least one bit of the data in the main memory page does not
match the data in the buffer.
The device density is indicated using bits 5, 4, and 3 of the
status register. For the AT45D041, the three bits are 0, 1,
and 1. The decimal value of these three binary bits does
not equate to the device density; the three bits represent a
combinational code relating to differing densities of Serial
DataFlash devices, allowing a total of eight different density
configurations.
Read/Program Mode Summary
The modes listed above can be separated into two groups
— modes which make use of the flash memory array
(Group A) and modes which do not make use of the flash
memory array (Group B).
Group A modes consist of:
1. Main memory page read
2. Main memory page to buffer 1 (or 2) transfer
3. Main memory page to buffer 1 (or 2) compare
4. Buffer 1 (or 2) to main memory page program with
built-in erase
5. Buffer 1 (or 2) to main memory page program without built-in erase
6. Main memory page program
7. Auto page rewrite
Group B modes consist of:
1. Buffer 1 (or 2) read
2. Buffer 1 (or 2) write
3. Status read
If a Group A mode is in progress (not fully completed) then
another mode in Group A should not be started. However,
during this time in which a Group A mode is in progress,
modes in Group B can be started.
This gives the Serial DataFlash the ability to virtually
accommodate a continuous data stream. While data is
being programmed into main memory from buffer 1, data
can be loaded into buffer 2 (or vice versa). See application
note AN-4 (“Using Atmel’s Serial DataFlash”) for more
details.
Status Register Format
4
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
RDY/BUSY
COMP
0
1
1
X
X
X
AT45D041
AT45D041
HARDWARE PAGE WRITE PROTECT: If the WP pin is
held low, the first 256 pages of the main memory cannot be
reprogrammed. The only way to reprogram the first 256
pages is to first drive the protect pin high and then use the
program commands previously mentioned.
RESET: A low state on the reset pin (RESET) will terminate
the operation in progress and reset the internal state
machine to an idle state. The device will remain in the reset
condition as long as a low level is present on the RESET
pin. Normal operation can resume once the RESET pin is
brought back to a high level.
The device also incorporates an internal power-on reset circuit; therefore, there are no restrictions on the RESET pin
during power-on sequences.
READY/BUSY: This open drain output pin will be driven
low when the device is busy in an internally self-timed operation. This pin, which is normally in a high state (through an
external pull-up resistor), will be pulled low during programming operations, compare operations, and during page-tobuffer transfers.
The busy status indicates that the Flash memory array and
one of the buffers cannot be accessed; read and write
operations to the other buffer can still be performed.
Absolute Maximum Ratings*
Temperature Under Bias ......................-55°C to +125°C
*NOTICE:
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 VCC + 0.6V
Stresses beyond those listed under “Absolute
Maximum Ratings” may cause permanent damage 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.
DC and AC Operating Range
AT45D041
Operating Temperature (Case)
VCC Power Supply(1)
Note:
Com.
Ind.
0°C to 70°C
-40°C to 85°C
4.5V to 5.5V
1. After power is applied and V CC is at the minimum specified data sheet value, the system should wait 20 ms before an operational mode is started.
5
DC Characteristics
Symbol
Parameter
Condition
Min
Typ
Max
Units
ISB
Standby Current
CS, RESET, WP = VIH, all inputs at
CMOS levels
20
40
µA
ICC1
Active Current, Read Operation
f = 10 MHz; IOUT = 0 mA; VCC = 5.5V
15
25
mA
ICC2
Active Current, Program/Erase Operation
25
50
mA
ILI
Input Load Current
VIN = 0V to VCC
10
µA
ILO
Output Leakage Current
VI/O = 0V to VCC
10
µA
VIL
Input Low Voltage
0.8
V
VIH
Input High Voltage
VOL
Output Low Voltage
IOL = 2.1 mA
VOH1
Output High Voltage
IOH = -400 µA
2.4
V
VOH2
Output High Voltage
IOH = -100 µA; VCC = 4.5V
4.2
V
2.0
V
0.45
V
AC Characteristics
Symbol
Parameter
Min
fSCK
SCK Frequency
tCS
Minimum CS High Time
250
ns
tCSS
CS Setup Time
250
ns
tCSH
CS Hold Time
250
ns
tWH
SCK High Time
40
ns
tWL
SCK Low Time
40
ns
tSU
Data In Setup Time
10
ns
tH
Data In Hold Time
25
ns
tHO
Output Hold Time
0
ns
tDIS
Output Disable Time
75
ns
tV
Output Valid
80
ns
tXFR
Page to Buffer Transfer/Compare Time
80
150
µs
tEP
Page Erase and Programming Time
10
20
ms
tP
Page Programming Time
7
14
ms
Input Test Waveforms and Measurement Levels
AC
DRIVING
LEVELS
2.4V
0.45V
2.0
0.8
AC
MEASUREMENT
LEVEL
tR, tF < 20 ns (10% to 90%)
6
AT45D041
Typ
Max
Units
10
MHz
Output Test Load
DEVICE
UNDER
TEST
30 pF
AT45D041
AC Waveforms
Two different timing diagrams are shown below. Waveform
1 shows the SCK signal being low when CS makes a highto-low transition, and Waveform 2 shows the SCK signal
being high when CS makes a high-to-low transition. Both
wavforms show valid timing diagrams. The setup and hold
times for the SI signal are referenced to the low-to-high
transition on the SCK signal.
Waveform 1 shows timing that is also compatible with SPI
Mode 0, and Waveform 2 shows timing that is compatible
with SPI Mode 3.
Waveform 1 – Inactive Clock Polarity Low
tCS
CS
tWH
tCSS
tWL
tCSH
SCK
tHO
tV
SO
HIGH IMPEDANCE
VALID OUT
tSU
SI
tDIS
HIGH IMPEDANCE
tH
VALID IN
Waveform 2 – Inactive Clock Polarity High
tCS
CS
tCSS
tWL
tWH
tCSH
SCK
tV
SO
tHO
HIGH Z
VALID OUT
tSU
SI
tDIS
HIGH IMPEDANCE
tH
VALID IN
Command Sequence for Read/Write Operations (Except Status Register Read)
SI
MSB
r r r r XXXX
Reserved for
larger densities
Notes:
CMD
8 bits
8 bits
XXXX XXXX
Page Address
(PA10-PA0)
8 bits
XXXX XXXX
LSB
Byte/Buffer Address
(BA8-BA0/BFA8-BFA0)
1.
“r” designates bits reserved for larger densities.
2.
It is recommended that “r” be a logical “0” for densities of 4M bit or smaller.
3.
For densities larger than 4M bit, the “r” bits become the most significant Page Address bit for the appropriate density.
7
Write Operations
The following block diagram and waveforms illustrate the various write sequences available.
FLASH MEMORY ARRAY
PAGE (264 BYTES)
BUFFER 1 TO
MAIN MEMORY
PAGE PROGRAM
MAIN MEMORY
PAGE PROGRAM
THROUGH BUFFER 2
BUFFER 1 (264 BYTES)
BUFFER 2 TO
MAIN MEMORY
PAGE PROGRAM
BUFFER 2 (264 BYTES)
MAIN MEMORY PAGE
PROGRAM THROUGH
BUFFER 1
BUFFER 1
WRITE
BUFFER 2
WRITE
I/O INTERFACE
SI
Main Memory Page Program through Buffers
· Completes writing into selected buffer
· Starts self-timed erase/program operation
CS
SI
CMD
r r r r, PA10-7
PA6-0, BFA8
BFA7-0
n
n+1
Last Byte
Buffer Write
· Completes writing into selected buffer
CS
SI
CMD
X
X···X, BFA8
BFA7-0
n
n+1
Last Byte
Buffer to Main Memory Page Program (Data from Buffer Programmed into Flash Page)
Starts self-timed erase/program operation
CS
SI
CMD
Each transition represents
8 bits and 8 clock cycles
8
AT45D041
r r r r, PA10-7
PA6-0, X
n = 1st byte written
n+1 = 2nd byte written
AT45D041
Read Operations
The following block diagram and waveforms illustrate the various read sequences available.
FLASH MEMORY ARRAY
PAGE (264 BYTES)
MAIN MEMORY
PAGE TO
BUFFER 2
MAIN MEMORY
PAGE TO
BUFFER 1
BUFFER 1 (264 BYTES)
BUFFER 2 (264 BYTES)
BUFFER 1
READ
MAIN MEMORY
PAGE READ
BUFFER 2
READ
I/O INTERFACE
SO
Main Memory Page Read
CS
SI
CMD
r r r r, PA10-7
BA7-0
PA6-0, BA8
X
X
X
X
SO
n
n+1
Main Memory Page to Buffer Transfer (Data from Flash Page Read into Buffer)
Starts reading page data into buffer
CS
SI
CMD
r r r r, PA10-7
PA6-0, X
X
SO
Buffer Read
CS
SI
SO
Each transition represents
8 bits and 8 clock cycles
CMD
X
X···X, BFA8
BFA7-0
X
n
n+1
n = 1st byte read
n+1 = 2nd byte read
9
Detailed Bit-Level Read Timing – Inactive Clock Parity Low
Main Memory Page Read
CS
SCK
1
2
3
4
5
60
61
62
63
64
0
X
X
X
X
X
65
66
67
tSU
COMMAND OPCODE
SI
1
0
1
0
tV
DATA OUT
HIGH-IMPEDANCE
SO
D7
MSB
D6
42
43
D5
Buffer Read
CS
SCK
1
2
3
4
5
36
37
38
39
40
0
X
X
X
X
X
41
tSU
COMMAND OPCODE
SI
1
0
1
0
tV
HIGH-IMPEDANCE
SO
DATA OUT
D7
MSB
D6
D5
Status Register Read
CS
SCK
1
2
0
1
3
4
5
6
7
8
1
1
9
10
11
12
16
17
tSU
COMMAND OPCODE
SI
0
1
0
1
tV
SO
10
HIGH-IMPEDANCE
AT45D041
STATUS REGISTER OUTPUT
D7
MSB
D6
D5
D1
D0
LSB
D7
MSB
AT45D041
Detailed Bit-Level Read Timing – Inactive Clock Polarity High
Main Memory Page Read
CS
SCK
1
2
3
4
5
61
62
63
64
65
66
67
68
tSU
COMMAND OPCODE
SI
1
0
1
0
0
X
X
X
X
X
tV
DATA OUT
HIGH-IMPEDANCE
SO
D7
MSB
D6
D5
D4
Buffer Read
CS
SCK
1
2
3
4
5
37
38
39
40
41
42
43
44
tSU
COMMAND OPCODE
SI
1
0
1
0
0
X
X
X
X
X
tV
DATA OUT
HIGH-IMPEDANCE
SO
D7
MSB
D6
D5
D4
Status Register Read
CS
SCK
1
2
3
4
5
6
7
8
9
10
11
12
17
18
tSU
COMMAND OPCODE
SI
0
1
0
1
0
1
1
1
tV
SO
HIGH-IMPEDANCE
STATUS REGISTER OUTPUT
D7
MSB
D6
D5
D4
D0
LSB
D7
MSB
D6
11
Table 1
Main Memory
Page Read
Buffer 1
Read
Buffer 2
Read
Main Memory
Page to Buffer 1
Transfer
Main Memory
Page to Buffer 2
Transfer
Main Memory
Page to Buffer 1
Compare
Main Memory
Page to Buffer 2
Compare
Buffer 1
Write
Buffer 2
Write
Opcode
52H
54H
56H
53H
55H
60H
61H
84H
87H
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
1
1
0
0
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
1
0
0
1
1
1
0
1
1
0
0
0
0
1
0
0
0
1
1
0
1
0
1
r
X
X
r
r
r
r
X
X
r
X
X
r
r
r
r
X
X
r
X
X
r
r
r
r
X
X
r
X
X
r
r
r
r
X
X
PA10
X
X
PA10
PA10
PA10
PA10
X
X
PA9
X
X
PA9
PA9
PA9
PA9
X
X
PA8
X
X
PA8
PA8
PA8
PA8
X
X
PA7
X
X
PA7
PA7
PA7
PA7
X
X
PA6
X
X
PA6
PA6
PA6
PA6
X
X
PA5
X
X
PA5
PA5
PA5
PA5
X
X
PA4
X
X
PA4
PA4
PA4
PA4
X
X
PA3
X
X
PA3
PA3
PA3
PA3
X
X
PA2
X
X
PA2
PA2
PA2
PA2
X
X
PA1
X
X
PA1
PA1
PA1
PA1
X
X
PA0
X
X
PA0
PA0
PA0
PA0
X
X
BA8
BFA8
BFA8
X
X
X
X
BFA8
BFA8
BA7
BFA7
BFA7
X
X
X
X
BFA7
BFA7
BA6
BFA6
BFA6
X
X
X
X
BFA6
BFA6
BA5
BFA5
BFA5
X
X
X
X
BFA5
BFA5
BA4
BFA4
BFA4
X
X
X
X
BFA4
BFA4
BA3
BFA3
BFA3
X
X
X
X
BFA3
BFA3
BA2
BFA2
BFA2
X
X
X
X
BFA2
BFA2
BA1
BFA1
BFA1
X
X
X
X
BFA1
BFA1
BA0
BFA0
BFA0
X
X
X
X
BFA0
BFA0
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
•
•
•
X (64th bit)
12
AT45D041
X (Don’t Care)
r (reserved bits)
AT45D041
Table 2
Buffer 1 to
Main
Memory
Page
Program
with BuiltIn Erase
Buffer 2 to
Main
Memory
Page
Program
with BuiltIn Erase
Buffer 1 to
Main
Memory
Page
Program
without
Built-In
Erase
Buffer 2 to
Main
Memory
Page
Program
without
Built-In
Erase
Main
Memory
Page
Program
Through
Buffer 1
Main
Memory
Page
Program
Through
Buffer 2
Auto Page
Rewrite
Through
Buffer 1
Auto Page
Rewrite
Through
Buffer 2
Status
Register
Opcode
83H
86H
88H
89H
82H
85H
58H
59H
57H
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
0
0
1
1
0
0
1
1
0
0
1
0
0
0
1
0
0
1
1
1
0
0
1
0
0
0
1
1
0
0
1
0
1
0
1
1
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
PA10
PA10
PA10
PA10
PA10
PA10
PA10
PA10
PA9
PA9
PA9
PA9
PA9
PA9
PA9
PA9
PA8
PA8
PA8
PA8
PA8
PA8
PA8
PA8
PA7
PA7
PA7
PA7
PA7
PA7
PA7
PA7
PA6
PA6
PA6
PA6
PA6
PA6
PA6
PA6
PA5
PA5
PA5
PA5
PA5
PA5
PA5
PA5
PA4
PA4
PA4
PA4
PA4
PA4
PA4
PA4
PA3
PA3
PA3
PA3
PA3
PA3
PA3
PA3
PA2
PA2
PA2
PA2
PA2
PA2
PA2
PA2
PA1
PA1
PA1
PA1
PA1
PA1
PA1
PA1
PA0
PA0
PA0
PA0
PA0
PA0
PA0
PA0
X
X
X
X
BA8
BA8
X
X
X
X
X
X
BA7
BA7
X
X
X
X
X
X
BA6
BA6
X
X
X
X
X
X
BA5
BA5
X
X
X
X
X
X
BA4
BA4
X
X
X
X
X
X
BA3
BA3
X
X
X
X
X
X
BA2
BA2
X
X
X
X
X
X
BA1
BA1
X
X
X
X
X
X
BA0
BA0
X
X
X (Don’t Care)
r (reserved bits)
13
Algorithm for Programming or Reprogramming of the Entire Array Sequentially
START
provide address
and data
BUFFER WRITE
(84H, 87H)
MAIN MEMORY PAGE PROGRAM
(82H, 85H)
BUFFER to MAIN
MEMORY PAGE PROGRAM
(83H, 86H)
END
Figure 1
Notes:
14
1.
This type of algorithm is used for applications in which the entire array is programmed sequentially, filling the array
page-by-page.
2.
A page can be written using either a Main Memory Page Program operation or a Buffer Write operation followed by a
Buffer to Main Memory Page Program operation.
3.
The algorithm above shows the programming of a single page. The algorithm will be repeated sequentially for each
page within the entire array.
AT45D041
AT45D041
Algorithm for Randomly Modifying Data
START
provide address of
page to modify
MAIN MEMORY PAGE
to BUFFER TRANSFER
(53H, 55H)
If planning to modify multiple
bytes currently stored within
a page of the Flash array
BUFFER WRITE
(84H, 87H)
MAIN MEMORY PAGE PROGRAM
(82H, 85H)
BUFFER to MAIN
MEMORY PAGE PROGRAM
(83H, 86H)
(2)
Auto Page Rewrite
(58H, 59H)
INCREMENT PAGE
(2)
ADDRESS POINTER
END
Figure 2
Notes:
1.
To preserve data integrity, each page of the DataFlash memory array must be updated/rewritten at least once within
every 10,000 cumulative page erase/program operations.
2.
A Page Address Pointer must be maintained to indicate which page is to be rewritten. The Auto Page Rewrite command must use the address specified by the Page Address Pointer.
3.
Other algorithms can be used to rewrite portions of the Flash array. Low power applications may choose to wait until
10,000 cumulative page erase/program operations have accumulated before rewriting all pages of the Flash array. See
application note AN-4 (“Using Atmel’s Serial DataFlash”) for more details.
15
Ordering Information
ICC (mA)
fSCK
(MHz)
Active
Standby
Ordering Code
Package
10
25
0.04
AT45D041-JC
32J
AT45D041-RC
28R
AT45D041-TC
28T
AT45D041-JI
32J
AT45D041-RI
28R
AT45D041-TI
28T
10
25
0.04
Package Type
32J
32-Lead, Plastic J-Leaded Chip Carrier Package (PLCC)
28R
28-Lead, 0.330” Wide, Plastic Gull-Wing Small Outline Package (SOIC)
28T
28-Lead, Plastic Thin Small Outline Package (TSOP)
16
AT45D041
Operation Range
Commercial
(0°C to 70°C)
Industrial
(-40°C to 85°C)