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參數(shù)資料
| 型號： | 29LV650 |
| 廠商： | Fujitsu Limited |
| 英文描述： | 64M (4M x 16) BIT |
| 中文描述： | 64M號（4米× 16）位 |
| 文件頁數(shù)： | 18/57頁 |
| 文件大?。?/td> | 625K |
| 代理商： | 29LV650 |
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MBM29LV650UE/651UE-
90/12
18
Word 0 (A
0
= V
IL
) represents the manufacturer’s code (Fujitsu = 04h) and word 1 (A
0
= V
IH
) represents the device
identifier code (MBM29LV650UE/651UE = 22D7h). Word 3 (A
0
= A
1
= V
IH
) represents the Extended Code
(MBM29LV650UE = 2201h, MBM29LV651UE = 2200h). These three words are given in the tables 4.1 to 4.2.
All identifiers for manufactures and device will exhibit odd parity with DQ
7
defined as the parity bit. In order to
read the proper device codes when executing the autoselect, A
1
must be V
IL
. (See Tables 4.1 to 4.2.)
In order to determine which sectors are write protected, A
1
must be at V
IH
while running through the sector
addresses; if the selected sector is protected, a logical ‘1’ will be output on DQ
0
(DQ
0
= 1).
Write
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
IL
, while CE is at V
IL
and OE is at V
IH
. Addresses are latched on
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.
Sector Group Protection
The MBM29LV650UE/651UE features hardware sector group protection. This feature will disable both program
and erase operations in any combination of twenty five sector groups of memory. (See Table 6). The sector
group protection feature is enabled using programming equipment at the user’s site. The device is shipped with
all sector groups unprotected.
To activate this mode, the programming equipment must force V
ID
on address pin A
9
and control pin OE, (suggest
V
ID
= 11.5 V), CE = V
IL
and A
0
= A
6
= V
IL
, A
1
= V
IH
. The sector group addresses (A
21
, A
20
, A
19
, A
18
, and A
17
) should
be set to the sector to be protected. Table 5 defines the sector address for each of the one hundred twenty-eight
(128) individual sectors, and tables 2 defines the sector group address for each of the thirty-two (32) individual
group 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 group addresses must be held constant during the WE pulse.
See figures 12 and 20 for sector group protection waveforms and algorithm.
To verify programming of the protection circuitry, the programming equipment must force V
ID
on address pin A
9
with CE and OE at V
IL
and WE at V
IH
. Scanning the sector group addresses (A
21
, A
20
, A
19
, A
18
, and A
17
) while
(A
6
, A
1
, A
0
) = (0, 1, 0) will produce a logical “1” code at device output DQ
0
for a protected sector. Otherwise the
device will produce “0” for unprotected sector. In this mode, the lower order addresses, except for A
0
, A
1
, and
A
6
are DON’T CARES. Address locations with A
1
= V
IL
are reserved for Autoselect manufacturer and device codes.
It is also possible to determine if a sector group 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
21
, A
20
, A
19
, A
18
,
and A
17
) are the desired sector group address will produce a logical “1” at DQ
0
for a protected sector group. See
Tables 4.1 and 4.2 for Autoselect codes.
Temporary Sector Group Unprotection
This feature allows temporary unprotection of previously protected sector groups of the MBM29LV650UE/651UE
devices in order to change data. The Sector Group Unprotection mode is activated by setting the RESET pin to
high voltage (V
ID
). During this mode, formerly protected sector groups can be programmed or erased by selecting
the sector group addresses. Once the V
ID
is taken away from the RESET pin, all the previously protected sector
groups will be protected again. Refer to Figures 13 and 21.
This temporary sector group unprotect mode is disabled whenever the chip is in the Hidden ROM (Hi-ROM)
mode. This area can not be programmed within this mode. Moreover once this area is programmed, it is always
protected no matter in which mode.
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