MX29LV320E 查看數據表（PDF） - Macronix International
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MX29LV320E Datasheet PDF : 68 Pages
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MX29LV320E T/B
COMMAND OPERATIONS (cont'd)
READ MANUFACTURER ID OR DEVICE ID
The Manufacturer ID (identification) is a unique hexadecimal number assigned to each manufacturer by the JE-
DEC committee. Each company has its own manufacturer ID, which is different from the ID of all other compa-
nies. The number assigned to Macronix is C2h.
The Device ID is a unique hexadecimal number assigned by the manufacturer for each one of the flash devices
made by that manufacturer.
The above two ID types are stored in a 16-bit register on the flash device -- eight bits for each ID. This register is
normally read by the user or by the programming machine to identify the manufacturer and the specific device.
After entering Automatic Select mode, performing a read operation with A1 & A0 held LOW will cause the device
to output the Manufacturer ID on the Data I/O (Q7 to Q0) pins. Performing a read operation with A1 LOW and A0
HIGH will cause the device to output the Device ID.
SECURITY SECTOR LOCK STATUS
After entering Automatic Select mode, the customer can check the lock status of the Security Sector by perform-
ing a read operations with A0 and A1 held HIGH. If the code 99h is read from data pins Q7 to Q0, the sector has
been locked at the factory. If the code 19h is read, the sector has not been locked at the factory.
VERIFY SECTOR GROUP PROTECTION
After entering Automatic Select mode, performing a read operation with A1 held HIGH and A0 held LOW and the
address of the sector to be checked applied to A20 to A12, data bit Q0 will indicate the protected status of the
addressed sector. If Q0 is HIGH, the sector is protected. Conversely, if Q0 is LOW, the sector is unprotected.
SECURITY SECTOR FLASH MEMORY REGION
The Security Sector region is an extra OTP memory space of 256Bytes (128Words) in length. The Security Sec-
tor can be locked by the factory prior to shipping, or it can be locked by the customer later.
In factory-locked device, security sector region is protected when shipped from factory and the security silicon
sector indicator bit, Q7 (at autoselect address 03h) 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 Sector is permanently locked before shipping from the factory. The de-
vice will have a 16-byte (8-word) ESN in the security region. In bottom boot devices, the ESN occupies address-
es 00000h to 0000Fh in byte mode or 00000h to 00007h in word mode. In top boot devices, the ESN occupies
addresses 3F0000h to 3F000Fh in byte mode or 1F8000h to 1F8007h in word mode.
P/N:PM1575
REV. 1.3, DEC. 19, 2013
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