MX29LV640D MCNIX [Macronix International], MX29LV640D Datasheet - Page 17

• Manufacturer Part Number: MX29LV640D
• Description: 64M-BIT [8M x 8/4M x 16] SINGLE VOLTAGE 3V
• Manufacturer: MCNIX [Macronix International]

MX29LV640D T/B
WRITE PROTECT (WP#)
Another function of the WP#/ACC pin is to provide write protection function on the two outermost 8 Kbyte boot sectors.
When ViL is asserted on WP#/ACC pin, the two boot sectors are protected regardless of the previous state of protec-
tion implemented by aforementioned Sector Group Protect/Chip Unprotect. For MX29LV640DT, the two outermost
sectors are the two boot sectors of the highest addresses. For MX29LV640DB, the two outermost sectors are the two
boot sectors of the lowest addresses.
Note that the WP#/ACC should be either Vhv, Vih, or Vil, and must not be floated or unconnected; otherwise the device
may not function properly.
AUTOMATIC SELECT OPERATION
When the device is in Read array mode, erase-suspended read array mode or CFI mode, user can issue read silicon
ID command to enter read silicon ID mode. After entering read silicon ID mode, user can query several silicon IDs
continuously and does not need to issue read silicon ID mode again. When A0 is Low, device will output Macronix
Manufacture ID C2H. When A0 is high, device will output Device ID. In read silicon ID mode, issuing reset command
will reset device back to read array mode or erase-suspended read array mode.
Another way to enter read silicon ID is to apply high voltage on A9 pin with CE#, OE#, A6 and A1 at Vil. While the high
voltage of A9 pin is discharged, device will automatically leave read silicon ID mode and go back to read array mode
or erase-suspended read array mode. When A0 is Low, device will output Macronix Manufacture ID C2. When A0 is
high, device will output Device ID.
VERIFY SECTOR GROUP PROTECT STATUS OPERATION
MX29LV640D T/B provides hardware sector protection against Program and Erase operation for protected sectors. The
sector protect status can be read through Sector Protect Verify command. This method requires V
on A9 pin, Vih on
hv
WE# and A1 pins, Vil on CE#, OE#, A6 and A0 pins, and sector address on A12 to A21 pins. If the read out data is
01H, the designated sector is protected. Oppositely, if the read out data is 00H, the designated sector is not protected.
SECURITY SECTOR FLASH MEMORY REGION
The Security Sector region is an extra memory space of 128 words in length. The security sectors can be locked upon
shipping from factory, or it can be locked by customer after shipping. Customer can issue Security Sector Factory
Protect Verify and/or Security Sector Protect Verify to query the lock status of the device.
In factory-locked device, security sector region is protected when shipped from factory and the security silicon sector
indicator bit is set to "1". In customer lockable device, security sector region is unprotected when shipped from factory
and the security silicon indicator bit is set to "0".
Factory Locked: Security Sector Programmed and Protected at the Factory
In a factory locked device, the security silicon region is permanently locked after shipping from factory. The device will
have a 16-byte (8-word) ESN in the security region. In bottom boot device : 000000h - 000007h (for MX29LV640DB).In
Top boot device : 3FFF70h - 3FFF77h (for MX29LV640DT).
P/N:PM1208
REV. 1.6, AUG. 16, 2008
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