MBM29LV002TC-70 Meet Spansion Inc., MBM29LV002TC-70 Datasheet - Page 15

• Manufacturer Part Number: MBM29LV002TC-70
• Description: Flash Memory Cmos 2m 256k ? 8 Bit
• Manufacturer: Meet Spansion Inc.

Write
Sector Protection
The manufacturer and device codes may also be read via the command register, for instances when the
MBM29LV002TC/BC are erased or programmed in a system without access to high voltage on the A
command sequence is illustrated in “MBM29LV002TC/002BC Standard Command Definitions” in ■ DEVICE
BUS OPERATION. (Refer to “Autoselect Command”.)
Byte 0 (A
code (MBM29LV002TC = 40h and MBM29LV002BC = C2h). These two bytes/words are given in
“MBM29LV002TC/002BC Sector Protection Verify Autoselect Codes” and “Expanded Autoselect Code Table”
in ■ DEVICE BUS OPERATION. All identifiers for manufactures and device will exhibit odd parity with DQ
defined as the parity bit. In order to read the proper device codes when executing the autoselect, A
V
Table” in ■ DEVICE BUS OPERATION.)
Device erasure and programming are accomplished via the command register. The contents of the register serve
as inputs to the internal state machine. The state machine outputs dictate the function of the device.
The command register itself does not occupy any addressable memory location. The register is a latch used to
store the commands, along with the address and data information needed to execute the command. The
command register is written by bringing WE to V
the falling edge of WE or CE, whichever happens later; while data is latched on the rising edge of WE or CE,
whichever happens first. Standard microprocessor write timings are used.
Refer to AC Write Characteristics and the Erase/Programming Waveforms for specific timing parameters.
The MBM29LV002TC/BC feature hardware sector protection. This feature will disable both program and erase
operations in any number of sectors (0 through 6). The sector protection feature is enabled using programming
equipment at the user’s site. The devices are shipped with all sectors unprotected. Alternatively, Fujitsu may
program and protect sectors in the factory prior to shiping the device.
To activate this mode, the programming equipment must force V
V
to be protected. “Sector Address Tables (MBM29LV002TC)” and “Sector Address Tables (MBM29LV002BC)” in
■ FLEXIBLE SECTOR-ERASE ARCHITECTURE define the sector address for each of the seven (7) individual
sectors. Programming of the protection circuitry begins on the falling edge of the WE pulse and is terminated
with the rising edge of the same. Sector addresses must be held constant during the WE pulse. See “ (10) AC
Waveforms for Sector Protection Timing Diagram” in ■ TIMING DIAGRAM and “ (5) Sector Protection Algorithm”
in ■ FLOW CHART and for sector protection waveforms and algorithm.
To verify programming of the protection circuitry, the programming equipment must force V
with CE and OE at V
A
devices will read 00h for unprotected sector. In this mode, the lower order addresses, except for A
A
codes.
It is also possible to determine if a sector is protected in the system by writing an Autoselect command. Performing
a read operation at the address location XX02h, where the higher order addresses (A
are the desired sector address will produce a logical “1” at DQ
002BC Sector Protection Verify Autoselect Codes” and “Expanded Autoselect Code Table” in ■ DEVICE BUS
OPERATION for Autoselect codes.
IL
ID
1
10
, A
. (See “MBM29LV002TC/002BC Sector Protection Verify Autoselect Codes” and “Expanded Autoselect Code
= 11.5 V), CE = V
are DON’T CARES. Address locations with A
0
) = (0, 0, 1, 0) will produce a logical “1” code at device output DQ
0
= V
IL
) represents the manufacturer’s code (Fujitsu = 04h) and (A
IL
IL
, and A
MBM29LV002TC
and WE at V
6
= V
IL
. The sector addresses (A
IH
. Scanning the sector addresses (A
Retired Product DS05-20863-5E_July 26, 2007
IL
, while CE is at V
1
= V
IL
are reserved for Autoselect manufacturer and device
-70/-90
17
, A
ID
0
for a protected sector. See “MBM29LV002TC/
on address pin A
16
, A
/MBM29LV002BC
IL
and OE is at V
15
, A
0
17
for a protected sector. Otherwise the
0
14
, A
= V
, and A
16
IH
, A
) represents the device identifier
15
9
13
IH
, A
and control pin OE, (suggest
) should be set to the sector
. Addresses are latched on
14
17
, and A
, A
16
ID
, A
on address pin A
13
15
) while (A
, A
0
, A
14
1
, and A
9
must be
1
, A
pin. The
-70/-90
6
10
, and
, A
7
13
6
9
)
,
15