參數(shù)資料
型號(hào)： V29C51000B
廠商： Mosel Vitelic, Corp.
英文描述： 512K Bit 5 Volt CMOS Flash Memory(512K位5V CMOS閃速存儲(chǔ)器)
中文描述： 為512k位5伏的CMOS閃存（為512k位5V的CMOS閃速存儲(chǔ)器）
文件頁數(shù)： 10/16頁
文件大?。?/td> 80K
代理商： V29C51000B
10
MOSEL V ITELIC
V29C51000T/V29C51000B
V29C51000T/V29C51000B Rev. 0.2 February 1999
Table 2. Command Codes
NOTES:
1.
2.
3.
4.
Top Boot Sector
Bottom Boot Sector
PA: The address of the memory location to be programmed.
PD: The data at the byte address to be programmed.
Command
Sequence
First Bus
Program Cycle
Second Bus
Program Cycle
Third Bus
Program Cycle
Fourth Bus
Program Cycle
Fifth Bus
Program Cycle
Six Bus
Program Cycle
Address
Data
Address
Data
Address
Data
Address
Data
Address
Data
Address
Data
Read
XXXXH
F0H
Read
5555H
AAH
2AAAH
55H
5555H
F0H
RA
RD
Autoselect
5555H
AAH
2AAAH
55H
5555H
90H
00H
40H
01H
00H
(1)
A0H
(2)
Byte
Program
5555H
AAH
2AAAH
55H
5555H
A0H
PA
PD(4)
Chip Erase
5555H
AAH
2AAAH
55H
5555H
80H
5555H
AAH
2AAAH
55H
5555H
10H
Sector Erase
5555H
AAH
2AAAH
55H
5555H
80H
5555H
AAH
2AAAH
55H
PA(3)
30H
Chip Erase Cycle
The V29C51000T/V29C51000B features a chip-
erase operation. The chip erase operation is
initiated by using a specific six-bus-cycle
sequence: two unlock program cycles, a setup
command, two additional unlock program cycles,
and the chip erase command (see Table 2).
The chip erase operation is performed
sequentially, one sector at a time. When the
automated on chip erase algorithm is requested
with the chip erase command sequence, the device
automatically programs and verifies the entire
memory array for an all zero pattern prior to erasure
The automatic erase begins on the rising edge of
the last WE or CE pulse in the command sequence
and terminates when the data on DQ7 is “1”.
Program Cycle Status Detection
There are two methods for determining the state
of the V29C51000T/V29C51000B during a
program (erase/program) cycle: DATA Polling
(I/O
7
) and Toggle Bit (I/O
6
).
DATA Polling (I/O
7
)
The V29C51000T/V29C51000B features DATA
polling to indicate the end of a program cycle.
When the device is in the program cycle, any
attempt to read the device will received the
complement of the loaded data on I/O
7
. Once the
program cycle is completed, I/O
7
will show true
data, and the device is then ready for the next
cycle.
Toggle Bit (I/O
6
)
The V29C51000T/V29C51000B also features
another method for determining the end of a
program cycle. When the device is in the program
cycle, any attempt to read the device will result in
l/O
6
toggling between 1 and 0. Once the program is
completed, the toggling will stop. The device is then
ready for the next operation. Examining the toggle
bit may begin at any time during a program cycle.
Boot Block Protection
The V29C51000T/V29C51000B features
hardware Boot Block Protection. This feature will
prevent erasing/programming of data in the Boot
Block once the feature is enabled (see Table 3).
The device is shipped with the Boot Block
unprotected.
Autoselect
The V29C51000T/V29C51000B features an
Autoselect mode to identify the Boot Block
(protected/unprotected), the Device (Top/Bottom),
and the manufacturer ID.
To get to the Autoselect mode, a high voltage
(V
H
) must be applied to the A
9
pin. Once the A
9
signal is returned to LOW or HIGH, the device will
return to the previous mode.
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