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PDF A29400TV-70 Data sheet ( Hoja de datos )

Número de pieza A29400TV-70
Descripción 512K X 8 Bit / 256K X 16 Bit CMOS 5.0 Volt-only/ Boot Sector Flash Memory
Fabricantes AMIC Technology 
Logotipo AMIC Technology Logotipo



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A29040A Series
Preliminary
512K X 8 Bit CMOS 5.0 Volt-only,
Uniform Sector Flash Memory
Features
n 5.0V ± 10% for read and write operations
n Access times:
- 55/70/90 (max.)
n Current:
- 20 mA typical active read current
- 30 mA typical program/erase current
- 1 µA typical CMOS standby
n Flexible sector architecture
- 8 uniform sectors of 64 Kbyte each
- Any combination of sectors can be erased
- Supports full chip erase
- Sector protection:
A hardware method of protecting sectors to prevent
any inadvertent program or erase operations within
that sector
n Embedded Erase Algorithms
- Embedded Erase algorithm will automatically erase
the entire chip or any combination of designated
sectors and verify the erased sectors
General Description
The A29040A is a 5.0 volt-only Flash memory organized as
524,288 bytes of 8 bits each. The 512 Kbytes of data are
further divided into eight sectors of 64 Kbytes each for flexible
sector erase capability. The 8 bits of data appear on I/O0 - I/O7
while the addresses are input on A0 to A18. The A29040A is
offered in 32-pin PLCC, TSOP, and PDIP packages. This
device is designed to be programmed in-system with the
standard system 5.0 volt VCC supply. Additional 12.0 volt VPP
is not required for in-system write or erase operations.
However, the A29040A can also be programmed in standard
EPROM programmers.
The A29040A has a second toggle bit, I/O2, to indicate
whether the addressed sector is being selected for erase, and
also offers the ability to program in the Erase Suspend mode.
The standard A29040A offers access times of 55, 70 and 90
ns, allowing high-speed microprocessors to operate without
wait states. To eliminate bus contention the device has
separate chip enable ( CE ), write enable ( WE ) and output
enable ( OE ) controls.
The device requires only a single 5.0 volt power supply for
both read and write functions. Internally generated and
regulated voltages are provided for the program and erase
operations.
- Embedded Program algorithm automatically writes
and verifies bytes at specified addresses
n Typical 100,000 program/erase cycles per sector
n 20-year data retention at 125°C
- Reliable operation for the life of the system
n Compatible with JEDEC-standards
- Pinout and software compatible with single-power-
supply Flash memory standard
- Superior inadvertent write protection
n Data Polling and toggle bits
- Provides a software method of detecting completion
of program or erase operations
n Erase Suspend/Erase Resume
- Suspends a sector erase operation to read data from,
or program data to, a non-erasing sector, then
resumes the erase operation
n Package options
- 32-pin P-DIP, PLCC, or TSOP (Forward type)
The A29040A is entirely software command set compatible
with the JEDEC single-power-supply Flash standard.
Commands are written to the command register using
standard microprocessor write timings. Register contents
serve as input to an internal state-machine that controls the
erase and programming circuitry. Write cycles also internally
latch addresses and data needed for the programming and
erase operations. Reading data out of the device is similar to
reading from other Flash or EPROM devices.
Device programming occurs by writing the proper program
command sequence. This initiates the Embedded Program
algorithm - an internal algorithm that automatically times the
program pulse widths and verifies proper program margin.
Device erasure occurs by executing the proper erase
command sequence. This initiates the Embedded Erase
algorithm - an internal algorithm that automatically
preprograms the array (if it is not already programmed)
before executing the erase operation. During erase, the
device automatically times the erase pulse widths and
verifies proper erase margin.
PRELIMINARY (August, 2001, Version 0.1)
1
AMIC Technology, Inc.

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A29400TV-70 pdf
A29040A Series
Requirements for Reading Array Data
To read array data from the outputs, the system must drive
the CE and OE pins to VIL. CE is the power control and
selects the device. OE is the output control and gates
array data to the output pins. WE should remain at VIH all
the time during read operation. 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 command is necessary in this mode to obtain array
data. Standard microprocessor read cycles that assert valid
addresses on the device address inputs produce 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 specifications and to
the Read Operations Timings diagram for the timing
waveforms, lCC1 in the DC Characteristics table represents
the active current specification for reading array data.
Writing Commands/Command Sequences
To write a command or command sequence (which
includes programming data to the device and erasing
sectors of memory), the system must drive WE and CE to
VIL, and OE to VIH. An erase operation can erase one
sector, multiple sectors, or the entire device. The Sector
Address Tables indicate the address range that each sector
occupies. A "sector address" consists of the address inputs
required to uniquely select a sector. See the "Command
Definitions" section for details on erasing a sector or the
entire chip, or suspending/resuming the erase operation.
After the system writes the autoselect command sequence,
the device enters the autoselect mode. The system can
then read autoselect codes from the internal register (which
is separate from the memory array) on I/O7 - I/O0. Standard
read cycle timings apply in this mode. Refer to the
"Autoselect Mode" and "Autoselect Command Sequence"
sections for more information.
ICC2 in the Characteristics table represents the active
current specification for the write mode. The "AC
Characteristics" section contains timing specification tables
and timing diagrams for write operations.
Program and Erase Operation Status
During an erase or program operation, the system may
check the status of the operation by reading the status bits
on I/O7 - I/O0. Standard read cycle timings and ICC read
specifications apply. Refer to "Write Operation Status" for
more information, and to each AC Characteristics section
for timing diagrams.
Standby Mode
When the system is not reading or writing to the device, it
can place the device in the standby mode. In this mode,
current consumption is greatly reduced, and the outputs are
placed in the high impedance state, independent of the OE
input.
The device enters the CMOS standby mode when the CE
pin is held at VCC ± 0.5V. (Note that this is a more restricted
voltage range than VIH.) The device enters the TTL standby
mode when CE is held at VIH. The device requires the
standard access time (tCE) before it is ready to read data.
If the device is deselected during erasure or programming,
the device draws active current until the operation is
completed.
ICC3 in the DC Characteristics tables represents the standby
current specification.
Output Disable Mode
When the OE input is at VIH, output from the device is
disabled. The output pins are placed in the high impedance
state.
Sector
A18
SA0 0
SA1 0
SA2 0
SA3 0
SA4 1
SA5 1
SA6 1
SA7 1
Note: All sectors are 64 Kbytes in size.
Table 2. Sector Addresses Table
A17 A16
00
01
10
11
00
01
10
11
Address Range
00000h - 0FFFFh
10000h - 1FFFFh
20000h - 2FFFFh
30000h - 3FFFFh
40000h - 4FFFFh
50000h - 5FFFFh
60000h - 6FFFFh
70000h - 7FFFFh
PRELIMINARY (August, 2001, Version 0.1)
5
AMIC Technology, Inc.

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A29400TV-70 arduino
Write Operation Status
Several bits, I/O2, I/O3, I/O5, I/O6, and I/O7, are provided in the
A29040A to determine the status of a write operation. Table 5
and the following subsections describe the functions of these
status bits. I/O7, I/O6 and I/O2 each offer a method for
determining whether a program or erase operation is complete
or in progress. These three bits are discussed first.
I/O7: Data Polling
The Data Polling bit, I/O7, indicates to the host system
whether an Embedded Algorithm is in progress or completed,
or whether the device is in Erase Suspend. Data Polling is
valid after the rising edge of the final WE pulse in the program
or erase command sequence.
During the Embedded Program algorithm, the device outputs
on I/O7 the complement of the datum programmed to I/O7. This
I/O7 status also applies to programming during Erase Suspend.
When the Embedded Program algorithm is complete, the
device outputs the datum programmed to I/O7. The system
must provide the program address to read valid status
information on I/O7. If a program address falls within a
protected sector, Data Polling on I/O7 is active for
approximately 2µs, then the device returns to reading array
data.
During the Embedded Erase algorithm, Data Polling produces
a "0" on I/O7. When the Embedded Erase algorithm is
complete, or if the device enters the Erase Suspend mode,
Data Polling produces a "1" on I/O7.This is analogous to the
complement/true datum output described for the Embedded
Program algorithm: the erase function changes all the bits in a
sector to "1"; prior to this, the device outputs the
"complement," or "0." The system must provide an address
within any of the sectors selected for erasure to read valid
status information on I/O7.
After an erase command sequence is written, if all sectors
selected for erasing are protected, Data Polling on I/O7 is
active for approximately 100µs, then the device returns to
reading array data. If not all selected sectors are protected, the
Embedded Erase algorithm erases the unprotected sectors,
and ignores the selected sectors that are protected.
When the system detects I/O7 has changed from the
complement to true data, it can read valid data at I/O7 - I/O0 on
the following read cycles. This is because I/O7 may change
asynchronously with I/O0 - I/O6 while Output Enable ( OE ) is
asserted low. The Data Polling Timings (During Embedded
Algorithms) figure in the "AC Characteristics" section illustrates
this. Table 5 shows the outputs for Data Polling on I/O7.
Figure 3 shows the Data Polling algorithm.
A29040A Series
START
Read I/O7-I/O0
Address = VA
I/O7 = Data ?
Yes
No
No
I/O5 = 1?
Yes
Read I/O7 - I/O0
Address = VA
I/O7 = Data ?
Yes
No
FAIL
PASS
Note :
1. VA = Valid address for programming. During a sector
erase operation, a valid address is an address within any
sector selected for erasure. During chip erase, a valid
address is any non-protected sector address.
2. I/O7 should be rechecked even if I/O5 = "1" because
I/O7 may change simultaneously with I/O5.
Figure 3. Data Polling Algorithm
PRELIMINARY (August, 2001, Version 0.1)
11
AMIC Technology, Inc.

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