MX29LAA641D MCNIX [Macronix International], MX29LAA641D Datasheet - Page 14

• Manufacturer Part Number: MX29LAA641D
• Description: 64M-BIT [4M x 16/8M x 8] CMOS EQUAL SECTOR
• Manufacturer: MCNIX [Macronix International]

WRITE PROTECT (WP#)
This Write Protect function provides a hardware protection method to protect all sectors without using Vhv.
By driving the WP#/ACC pin Low, the device disable program and erase function in all sectors. If the WP#/ACC is held
high (Vih to Vcc), these sectors revert to their previous protected/unprotected status.
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. In read silicon ID mode, issuing reset command
will reset device back to read array mode or erase-suspended read array mode.
MX29LA641D H/L provides hardware method to access the silicon ID read operation. Which method requires Vhv on A9
pin, Vil on CEx, OE# and A6 pins. Which apply A1=Vil, A0=Vil, the device will output MXIC's manufacture code of C2h.
Which apply A1=Vil, A0=Vih, the device will output device code of 227Eh. Table 2 shows the sequence for reading
MX29LA641D H/L device codes.
VERIFY SECTOR PROTECT STATUS OPERATION
MX29LA641D H/L 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 Vhv on A9 pin, Vih on
WE# and A1 pins, Vil on CEx, OE#, A6 and A0 pins, and sector address on A15 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 OTP 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 at address : 000000h - 000007h.
The secured silicon sector address space in this device is allocated as follows.
P/N:PM1289
Secured Silicon Sector
Address Range
000000h-000007h
000008h-00007Fh
Standard Factory
Locked
ESN
Unavailable
14
MX29LA641D H/L
Express Flash
Factory Locked
ESN or Determined
by Customer
Determined
by Customer
Customer
Lockable
Determined by
Customer
REV. 1.1, JAN. 06, 2009