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AT29C010A Datasheet(PDF) 3 Page - ATMEL Corporation

Part No. AT29C010A
Description  1-Megabit (128K x 8) 5-volt Only Flash Memory
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT29C010A Datasheet(HTML) 3 Page - ATMEL Corporation

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AT29C010A
0394E–FLASH–11/02
The sector address must be valid during each high to low transition of WE (or CE). A0 to
A6 specify the byte address within the sector. The bytes may be loaded in any order;
sequential loading is not required. Once a programming operation has been initiated,
and for the duration of t
WC, a read operation will effectively be a polling operation.
SOFTWARE DATA PROTECTION: A software controlled data protection feature is
available on the AT29C010A. Once the software protection is enabled a software algo-
rithm must be issued to the device before a program may be performed. The software
protection feature may be enabled or disabled by the user; when shipped from Atmel,
the software data protection feature is disabled. To enable the software data protection,
a series of three program commands to specific addresses with specific data must be
performed. After the software data protection is enabled the same three program com-
mands must begin each program cycle in order for the programs to occur. All software
program commands must obey the sector program timing specifications. Once set, the
software data protection feature remains active unless its disable command is issued.
Power transitions will not reset the software data protection feature, however the soft-
ware feature will guard against inadvertent program cycles during power transitions.
Once set, software data protection will remain active unless the disable command
sequence is issued.
After setting SDP, any attempt to write to the device without the 3-byte command
sequence will start the internal write timers. No data will be written to the device; how-
ever, for the duration of tWC, a read operation will effectively be a polling operation.
After the software data protection’s 3-byte command code is given, a byte load is per-
formed by applying a low pulse on the WE or CE input with CE or WE low (respectively)
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. The 128 bytes of data must
be loaded into each sector by the same procedure as outlined in the program section
under device operation.
HARDWARE DATA PROTECTION: Hardware features protect against inadvertent pro-
grams to the AT29C010A in the following ways: (a) VCC sense – if VCC is below 3.8V
(typical), the program function is inhibited; (b) VCC power on delay – once VCC has
reached the VCC sense level, the device will automatically time out 5 ms (typical) before
programming; (c) Program inhibit – holding any one of OE low, CE high or WE high
inhibits program cycles; and (d) Noise filter—pulses of less than 15 ns (typical) on the
WE or CE inputs will not initiate a program cycle.
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 programmer to identify the correct
programming algorithm for the Atmel product. In addition, users may wish to use the
software product identification mode to identify the part (i.e. using the device code), and
have the system software use the appropriate sector size for program operations. In this
manner, the user can have a common board design for 256K to 4-megabit densities
and, with each density’s sector size in a memory map, have the system software apply
the appropriate sector size.
For details, see Operating Modes (for hardware operation) or Software Product Identifi-
cation. The manufacturer and device code is the same for both modes.
DATA POLLING: The AT29C010A features DATA polling to indicate the end of a pro-
gram cycle. During a program 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 com-
pleted, true data is valid on all outputs and the next cycle may begin. DATA polling may
begin at any time during the program cycle.


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