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MT29F2G01ABAGDSF Datasheet(PDF) 41 Page - Micron Technology |
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MT29F2G01ABAGDSF Datasheet(HTML) 41 Page - Micron Technology |
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41 / 88 page  PDF: 09005aef82784784 / Source: 09005aef82784840 Micron Technology, Inc., reserves the right to change products or specifications without notice. NDA_2gb_nand_m59a__2.fm - Rev. A 8/08 EN 41 ©2007 Micron Technology, Inc. All rights reserved. 2Gb x8, x16: NAND Flash Memory Command Definitions Micron Confidential and Proprietary Block Lock Feature The block lock feature of this NAND Flash device provides the ability to protect the entire device or ranges of blocks from PROGRAM and ERASE operations. Using this block lock feature offers increased functionality and flexibility over using just the WP# pin to prevent PROGRAM and ERASE operations. Block lock features are enabled and disabled at power-on through the use of the LOCK pin. At power-on, if LOCK is LOW, all block lock commands are disabled. However, at power-on, if LOCK is HIGH, the block lock commands are enabled and, by default, all of the blocks on the device are protected, or locked, from PROGRAM and ERASE opera- tions, even if WP# is HIGH. Before the contents of the device can be modified, the device must first be unlocked. Either a range of blocks or the entire device may be unlocked. PROGRAM and ERASE operations complete successfully only in the block ranges that have been unlocked. Blocks, once unlocked, can be locked again to protect them from further PROGRAM and ERASE operations. Blocks that are locked can be protected further, or locked tight. When locked tight, the device’s blocks can no longer be locked or unlocked until the device is power cycled. WP# and Block Lock • Holding WP# LOW locks all blocks provided the blocks are not locked tight. • If WP# is held LOW to lock blocks, then returned to HIGH, a new UNLOCK command must be issued to unlock blocks. UNLOCK 23h-24h By default at power-on if LOCK is HIGH, all of the blocks in the NAND Flash device are locked, meaning that they are protected from PROGRAM and ERASE operations. The UNLOCK (23h) command is used to unlock a range of blocks. Unlocked blocks have no protection and can be programmed or erased. The UNLOCK command uses two registers, a lower boundary block address register and an upper boundary block address register, and the invert area bit to determine what range of blocks are unlocked. When the invert area bit = 0, the range of blocks within the lower and upper boundary address registers are unlocked. When the invert area bit = 1, the range of blocks outside the boundaries of the lower and upper boundary address registers are unlocked. The lower boundary block address must be less than the upper boundary block address. Figures 31 and 32 on page 42 show examples of how the lower and upper boundary address registers work with the invert area bit. To unlock a range of blocks, issue the UNLOCK (23h) command followed by the appro- priate ADDRESS cycles that indicate the lower boundary block address. Then issue the 24h command followed by the appropriate ADDRESS cycles that indicate the upper boundary block address. The least significant page address bit, PA0, should be set to “1” if setting the invert area bit; otherwise, it should be “0.” The other page address bits should be “0” (see Figure 33 on page 43). Only one range of blocks can be specified in the lower and upper boundary block address registers. If after unlocking a range of blocks the UNLOCK command is again issued, the new block address range determines which blocks are unlocked. The previ- ous unlocked block address range is not retained. |
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