m29dw256g Numonyx, m29dw256g Datasheet - Page 7

• Manufacturer Part Number: m29dw256g
• Description: 256-mbit X16, Multiple Bank, Page, Dual Boot 3 V Supply Flash Memory
• Manufacturer: Numonyx

1
Description
The M29DW256G is a 256-Mbit (16 Mbit x16) non-volatile flash memory device that can be
read, erased, and reprogrammed. These operations can be performed using a single low
voltage (2.7 to 3.6 V) supply. On power-up the memory defaults to its read mode.
The M29DW256G features an asymmetrical block architecture with 8 parameter and 248
main blocks divided into four banks (A, B, C, D) providing multiple bank operations. While
programming or erasing in one bank, read operations are possible in any other bank. The
bank architecture is summarized in Table 2. Four of the parameter blocks are at the top of
the memory address space, and four 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.
Chip Enable, Output Enable and Write Enable signals control the bus operation of the
memory. They allow simple connection to most microprocessors, often without additional
logic.
The M29DW256G supports asynchronous random read and page read from all blocks of the
memory array. The devices also feature a write to buffer program capability that improves
the programming throughput by programming in one shot a buffer of 32 words/64 bytes. The
enhanced buffered program feature is also available to speed up the programming
throughput, allowing to program 256 words in one shot. The V
enable faster programming of the device.
The M29DW256G has an extra block, the extended block, of 128 words 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 not reversible, once
protected the protection cannot be undone.
The device features different levels of hardware and software block protection to avoid
unwanted program or erase (modify):
The M29DW256G is offered in TSOP56 (14 x 20 mm), TBGA64 (10 x 13 mm, 1 mm pitch),
and LBGA (11 x 13 mm) packages. The memories are delivered with all the bits erased (set
to ‘1’).
Hardware protection:
–
Software protection:
–
–
–
The VPP/WP provides a hardware protection of the four outermost parameter
blocks (two at the top and two at the bottom of the address space)
Volatile protection
Non-volatile protection
Password protection
PP
/WP signal can be used to
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