參數(shù)資料
型號(hào)： MX29LV640TXCI-12
廠商： MACRONIX INTERNATIONAL CO LTD
元件分類： DRAM
英文描述： 64M-BIT [8M x 8/4M x 16] SINGLE VOLTAGE 3V ONLY FLASH MEMORY
中文描述： 4M X 16 FLASH 3V PROM, 120 ns, PBGA64
封裝： 10 X 13 MM, 1.20 MM HEIGHT, 1 MM PITCH, PLASTIC, MO-216, CSP-64
文件頁(yè)數(shù)： 18/70頁(yè)
文件大?。?/td> 1188K
代理商： MX29LV640TXCI-12
18
P/N:PM0920
REV. 1.2, NOV. 05, 2003
MX29LV640T/B
It is also possible to determine if the chip is unprotect in
the system by writing the Read Silicon ID command.
Performing a read operation with A1=VIH, it will produce
00H at data outputs (Q0-Q7) for an unprotect sector. It is
noted that all sectors are unprotected after the chip
unprotect algorithm is completed.
WRITE PROTECT (WP)
The write protect function provides a hardware method
to protect boot sectors without using V
ID
.
If the system asserts VIL on the WP pin, the device
disables program and erase functions in the two "outer-
most" 8 Kbyte boot sectors independently of whether
those sectors were protected or unprotect using the
method described in Sector/Sector Group Protection and
Chip Unprotect". The two outermost 8 Kbyte boot sec-
tors are the two sectors containing the lowest addresses
in a bottom-boot-configured device, or the two sectors
containing the highest addresses in a top-boot-config-
ured device.
If the system asserts VIH on the WP pin, the device
reverts to whether the two outermost 8K Byte boot sec-
tors were last set to be protected or unprotect. That is,
sector protection or unprotection for these two sectors
depends on whether they were last protected or unprotect
using the method described in "Sector/Sector Group Pro-
tection and Chip Unprotect".
Note that the WP pin must not be left floating or uncon-
nected; inconsistent behavior of the device may result.
TEMPORARY SECTOR GROUP UNPROTECT
OPERATION
This feature allows temporary unprotect of previously
protected sector to change data in-system. The Tempo-
rary Sector Unprotect mode is activated by setting the
RESET pin to VID(11.5V-12.5V). During this mode, for-
merly protected sectors can be programmed or erased
as unprotect sector. Once VID is remove from the RE-
SET pin, all the previously protected sectors are pro-
tected again.
SILICON ID READ OPERATION
Flash memories are intended for use in applications where
the local CPU alters memory contents. As such, manu-
facturer and device codes must be accessible while the
device resides in the target system. PROM program-
mers typically access signature codes by raising A9 to
a high voltage. However, multiplexing high voltage onto
address lines is not generally desired system design prac-
tice.
MX29LV640T/B provides hardware method to access the
silicon ID read operation. Which method requires VID on
A9 pin, VIL on CE, OE, A6, and A1 pins. Which apply
VIL on A0 pin, the device will output MXIC's manufac-
ture code of C2H. Which apply VIH on A0 pin, the device
will output MX29LV640T/B device code of C9H/CBH.
VERIFY SECTOR GROUP PROTECT STATUS
OPERATION
MX29LV640T/B provides hardware method for sector
group protect status verify. Which method requires VID
on A9 pin, VIH on WE and A1 pins, VIL on CE, OE, A6,
and A0 pins, and sector address on A16 to A21 pins.
Which the identified sector is protected, the device will
output 01H. Which the identified sector is not protect,
the device will output 00H.
DATA PROTECTION
The MX29LV640T/B is designed to offer protection
against accidental erasure or programming caused by
spurious system level signals that may exist during power
transition. During power up the device automatically re-
sets the state machine in the Read mode. In addition,
with its control register architecture, alteration of the
memory contents only occurs after successful comple-
tion of specific command sequences. The device also
incorporates several features to prevent inadvertent write
cycles resulting from VCC power-up and power-down tran-
sition or system noise.
相關(guān)PDF資料
PDF描述
MX29LV640TXCI-90 64M-BIT [8M x 8/4M x 16] SINGLE VOLTAGE 3V ONLY FLASH MEMORY
MX29LV640TXEC-12 64M-BIT [8M x 8/4M x 16] SINGLE VOLTAGE 3V ONLY FLASH MEMORY
MX29LV640TXEC-90 64M-BIT [8M x 8/4M x 16] SINGLE VOLTAGE 3V ONLY FLASH MEMORY
MX29LV640TXEI-12 64M-BIT [8M x 8/4M x 16] SINGLE VOLTAGE 3V ONLY FLASH MEMORY
MX29LV640TXEI-90 64M-BIT [8M x 8/4M x 16] SINGLE VOLTAGE 3V ONLY FLASH MEMORY
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