MBM29LV001TC Fujitsu Microelectronics, Inc., MBM29LV001TC Datasheet - Page 14

• Manufacturer Part Number: MBM29LV001TC
• Description: 1m 128k X 8 Bit
• Manufacturer: Fujitsu Microelectronics, Inc.

14
MBM29LV001TC
Command Definitions
Read/Reset Command
Autoselect Command
Device operations are selected by writing specific address and data sequences into the command register.
Writing incorrect address and data values or writing them in the improper sequence will reset the devices to the
read mode. Table 6 defines the valid register command sequences. Note that the Erase Suspend (B0H) and
Erase Resume (30H) commands are valid only while the Sector Erase operation is in progress. Moreover both
Read/Reset commands are functionally equivalent, resetting the device to the read mode.
In order to return from Autoselect mode or Exceeded Timing Limits (DQ
operation is initiated by writing the Read/Reset command sequence into the command register. Microprocessor
read cycles retrieve array data from the memory. The devices remain enabled for reads until the command
register contents are altered.
The devices will automatically power-up in the read/reset state. In this case, a command sequence is not required
to read data. Standard microprocessor read cycles will retrieve array data. This default value ensures that no
spurious alteration of the memory content occurs during the power transition. Refer to the AC Read
Characteristics and Waveforms for the specific timing parameters.
Flash memories are intended for use in applications where the local CPU alters memory contents. As such,
manufacture and device codes must be accessible while the devices reside in the target system. PROM
programmers typically access the signature codes by raising A
voltage onto the address lines is not generally desired system design practice.
The device contains an Autoselect command operation to supplement traditional PROM programming
methodology. The operation is initiated by writing the Autoselect command sequence into the command register.
Following the command write, a read cycle from address XX00H retrieves the manufacture code of 04H. A read
cycle from address XX01H returns the device code (MBM29LV001TC = EDH and MBM29LV001BC = 6DH).
(See Tables 3.1 and 3.2.) All manufacturer and device codes will exhibit odd parity with DQ
bit. Sector state (protection or unprotection) will be informed by address XX02H.
Scanning the sector addresses (A
at device output DQ
the protected sector. (See Tables 2 and 3.)
To terminate the operation, it is necessary to write the Read/Reset command sequence into the register, and
also to write the Autoselect command during the operation, execute it after writing Read/Reset command
sequence.
0
for a protected sector. The programming verification should be perform margin mode on
-55/-70
16
, A
15
, A
/MBM29LV001BC
14
, A
13
and A
12
) while (A
9
to a high voltage. However, multiplexing high
6
, A
1
, A
5
= 1) to read/reset mode, the read/reset
0
) = (0, 1, 0) will produce a logical “1”
-55/-70
7
defined as the parity