MX29LV320E 데이터 시트보기 (PDF) - Macronix International
부품명
상세내역
제조사
MX29LV320E Datasheet PDF : 68 Pages
| |||
MX29LV320E T/B
FUNCTIONAL OPERATION DESCRIPTION (cont'd)
BYTE/WORD SELECTION
The BYTE# input pin is used to select the organization of the array data and how the data is input/output on the
Data (I/O) pins. If the BYTE# pin is held HIGH, Word mode will be selected and all 16 data lines (Q15 to Q0) will
be active.
If BYTE# is forced LOW, Byte mode will be active and only data lines Q7 to Q0 will be active. Data lines Q8 to
Q14 will remain in a high impedance state and Q15 becomes the A-1 address input pin.
HARDWARE WRITE PROTECT
By driving the WP#/ACC pin LOW, the outermost two boot sectors are protected from all erase/program opera-
tions. If WP#/ACC is held HIGH (Vih to VCC), these two outermost sectors revert to their previously protected/
unprotected status.
ACCELERATED PROGRAMMING OPERATION
By applying high voltage (Vhv) to the WP#/ACC pin, the device will enter the Accelerated Programming mode.
This mode permits the system to skip the normal command unlock sequences and program byte/word locations
directly. During accelerated programming, the current drawn from the WP#/ACC pin is no more than Icp1.
TEMPORARY SECTOR GROUP UNPROTECT OPERATION
The system can apply Vhv to the RESET# pin to place the device in Temporary Unprotect mode. In this mode,
previously protected sectors can be programmed/erased just as though they were unprotected. The device re-
turns to normal operation once Vhv is removed from the RESET# pin and previously protected sectors will once
again be protected.
SECTOR GROUP PROTECT OPERATION
The MX29LV320E T/B provides user programmable protection against program/erase operations for selected
sectors. Most sectors cannot protected individually. Instead, they are bound in groups of four or less called Sec-
tor-Groups. Protection is available for individual Sector-Groups, which includes all member sectors. Boot sec-
tors are the exception to this rule as they are assigned unique Sector-Group addresses and can be protected
individually without protecting any adjacent sectors or Sector-Groups. The three sectors adjacent to the boot
sectors form a non-standard Sector-Group. Please refer to Table 1a and Table 1b which show all Sector-Group
assignments.
During the protection operation, the sector address of any sector within a Sector-Group may be used to specify
the Sector-Group being protected.
There are two methods available to protect Sector-Groups. The first and preferred method is activated by apply-
ing Vhv on the RESET# pin and following the timing in Figure 13 and the algorithm shown in Figure 14. This is
a command operation that can be performed either on an external programmer or in-circuit by the system con-
troller. The second method is strictly a bus operation and is entered by asserting Vhv on A9 and OE# pins, with
A6 and CE# at Vil. The protection operation begins at the falling edge of WE# and terminates at the rising edge.
Contact Macronix for more details on this method.
P/N:PM1575
REV. 1.3, DEC. 19, 2013
18
Share Link: 