NAND Flash Memory MT29F4G08AAAWP ... - Micron

4Gb, 8Gb, and 16Gb x8 NAND Flash MemoryCommand DefinitionsOTP DATA PROTECT A5h-10hThe OTP DATA PROTECT (A5h-10h) command is used to protect all the data in the OTParea. After the data is protected it cannot be programmed further. When the OTP area isprotected, the pages within the area are no longer programmable and cannot be unprotected.To use the OTP DATA PROTECT command, issue the A5h command. Next, issue thefollowing 5 ADDRESS cycles: 00h-00h-01h-00h-00h. Finally, issue the 10h command.R/B# goes LOW while the OTP area is being protected. The protect command duration issimilar to a normal page programming operation, t PROG. The READ STATUS (70h)command is the only command valid during the OTP DATA PROTECT operation. Bit 5 ofthe status register will reflect the state of R/B#.When the device is ready, read bit 0 of the status register to determine if the operationpassed or failed (see Table 9 on page 26).Figure 24:OTP DATA PROTECT OperationCLECE#WE#t WCt WB t PROGALERE#I/OxA5hCol00hCol00h01h 00h 00h10h 70h StatusOTP DATA PROTECTcommandPROGRAMcommandREAD STATUScommandR/B#OTP data protected 1Don’t CareNotes:1. OTP data is protected following “good” status confirmation.OTP DATA READ AFh-30hThe OTP DATA READ (AFh-30h) command is used to read data from a page within theOTP area. An OTP page within the OTP area is available for reading data whether or notthe area is protected.To use the OTP DATA READ command, issue the AFh command. Next, issue 5 ADDRESScycles: the first 2 ADDRESS cycles are the column address, and for the remaining 3cycles select a page in the range of 02h-00h-00h through 0Bh-00h-00h. Finally, issue the30h command.PDF: 09005aef81b80e13/Source: 09005aef81b80eacMicron Technology, Inc., reserves the right to change products or specifications without notice.4gb_nand_m40a__2.fm - Rev. B 2/07 EN 34 ©2006 Micron Technology, Inc. All rights reserved.