AT49BV4096A-15RI Atmel, AT49BV4096A-15RI Datasheet - Page 4

• Manufacturer Part Number: AT49BV4096A-15RI
• Description: IC FLASH 4MBIT 150NS 44SOIC
• Manufacturer: Atmel

Specifications of AT49BV4096A-15RI

• Format - Memory: FLASH
• Memory Type: FLASH
• Memory Size: 4M (512K x 8 or 256K x 16)
• Speed: 150ns
• Interface: Parallel
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-SOIC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: AT49BV4096A15RI

timings are used. The address locations used in the command sequences are not
affected by entering the command sequences.
RESET: A RESET input pin is provided to ease some system 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 signal to the RESET pin, the boot block array can
be reprogrammed even if the boot block program lockout feature has been enabled (see
“Boot Block Programming Lockout Override” section).
ERASURE: Before a byte or word can be reprogrammed, it must be erased. The erased
state of memory bits is a logic “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
erase 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 four
sectors that can be individually erased. There are two 4K word parameter block sec-
tions, one 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. Whenever the main memory
block is erased and reprogrammed, the two parameter blocks should be erased and
reprogrammed before the main memory block is erased again. Whenever a parameter
block is erased and reprogrammed, the other parameter block should be erased and
reprogrammed before the first parameter block is erased again. Whenever the boot
block is erased and reprogrammed, the main memory block and the parameter blocks
should be erased and reprogrammed before the boot block is erased again.
BYTE/WORD PROGRAMMING: Once a memory block is erased, it is programmed (to
a logic “0”) on a byte-by-byte or word-by-word basis. Programming is accomplished via
the internal device command register and is a four-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 happens 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
cycle time. The Data Polling feature may also be used to indicate the
BP
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
AT49BV/LV4096A
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1618F–FLASH–11/02