m29dw641f STMicroelectronics, m29dw641f Datasheet - Page 8

• Manufacturer Part Number: m29dw641f
• Description: 64 Mbit 4mb X16, Multiple Bank, Boot Block 3v Supply Flash Memory
• Manufacturer: STMicroelectronics

Summary description
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Summary description
The M29DW641F is a 64 Mbit (4Mb x16) non-volatile memory that can be read, erased and
reprogrammed. These operations can be performed using a single low voltage (2.7 to 3.6V)
supply. On power-up the memory default to its Read mode.
The device features an asymmetrical block architecture, with 16 parameter and 126 main
blocks, divided into four Banks, A, B, C and D, providing Multiple Bank Operations. While
programming or erasing is underway in one group of banks (from 1 to 3), reading can be
conducted in any of the other banks.
Parameter Blocks are at the top of the memory address space, and eight are at the bottom.
Program and Erase commands are written to the Command Interface of the memory. An on-
chip Program/Erase Controller simplifies the process of programming or erasing the
memory by taking care of all of the special operations that are required to update the
memory contents. The end of a Program or Erase Operation can be detected and any error
conditions identified. The command set required to control the memory is consistent with
JEDEC standards.
The Chip Enable, Output Enable and Write Enable signals control the Bus Operation of the
memories. They allow simple connection to most microprocessors, often without additional
logic.
The M29DW641F has one extra 128 Word block (Extended Block) that can be accessed
using a dedicated command. The Extended Block can be protected and so is useful for
storing security information. However the protection is irreversible, once protected the
protection cannot be undone.
Each block can be erased independently, so it is possible to preserve valid data while old
data is erased.
The device features different levels of hardware and software block protection to avoid
unwanted program or erase (modify). The software block protection features are available in
16 bit memory organization only:
The memory is offered in TSOP48 (12x20mm) and TFBGA48 (6x8mm, 0.8mm pitch)
packages.
In order to meet environmental requirements, ST offers the M29DW641F in ECOPACK
packages. ECOPACK packages are Lead-free. The category of second Level Interconnect
is marked on the package and on the inner box label, in compliance with JEDEC Standard
JESD97. The maximum ratings related to soldering conditions are also marked on the inner
box label. ECOPACK is an ST trademark. ECOPACK specifications are available at:
www.st.com. The memory is supplied with all the bits erased (set to ’1’).
Hardware Protection:
–
–
Software Protection
–
–
The V
blocks (two at the top and two at the bottom of the address space).
The RP pin temporarily unprotects all the blocks previously protected using a High
voltage Block Protection technique (see
Protection).
Standard Protection
Password Protection
PP
/WP provides a hardware protection of the four outermost parameter
Table 2
summarizes the bank architecture. Eight of the
Appendix D: High voltage Block
M29DW641F
®