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16 Mbit LPC Serial Flash
A Microchip Technology Company
SST49LF016C
Data Sheet
Table 15: Block Locking Register Bits
Reserved Bit Read-Lock Bit Lock-Down Bit Write-Lock Bit
[7:3]
00000
00000
00000
00000
00000
00000
[2]
0
0
0
0
1
1
[1]
0
0
1
1
0
0
[0]
0
1
0
1
0
1
Lock Status
Full Access
Write Locked (Default State at Power-Up)
Locked Open (Full Access Locked Down)
Write Locked Down
Block Read Locked (Registers alterable)
Block Read & Write Lock (Registers alter-
able)
00000
1
1
0
Block Read Locked Down (Registers not
alterable)
00000
1
1
1
Block Read & Write lock Down (Registers
not alterable)
T15.0 25029
Write-Lock Bit
The Write-Lock bit, bit 0, controls the lock state described in Table 15. The default Write status of all
blocks after power up is write locked. When bit 0 of the Block Locking register is set, Program and
Erase operations for the corresponding block are prevented. Clearing the Write-Lock bit will unprotect
the block. The Write-Lock bit must be cleared prior to starting a Program or Erase operation since it is
sampled at the beginning of the operation. The Write-Lock bit functions in conjunction with the hard-
ware Write Lock pin TBL# for the top Boot Block. When TBL# is low, it overrides the software locking
scheme. The top Boot Block Locking register does not indicate the state of the TBL# pin. The Write-
Lock bit functions in conjunction with the hardware WP#/AAI pin for the remaining blocks (Blocks 0 to
33 for 49LF016C). When WP#/AAI is low, it overrides the software locking scheme. The Block Locking
register does not indicate the state of the WP#/AAI pin.
Lock-Down Bit
The Lock-Down bit, bit 1, controls the Block Locking register as described in Table 15. When in LPC
interface mode, the default Lock Down status of all blocks upon power-up is not locked down. Once the
Lock-Down bit is set, any future attempted changes to that Block Locking register will be ignored. The
Lock-Down bit is only cleared upon a device reset with RST# or INIT# or power down. Current Lock
Down status of a particular block can be determined by reading the corresponding Lock-Down bit.
Once a block’s Lock-Down bit is set, the Read-Lock and Write-Lock bits for that block can no longer be
modified: the block is locked down in its current state of read/write accessibility.
Read-Lock Bit
The default read status of all blocks upon power-up is read-unlocked. When a block’s read lock bit is
set, data cannot be read from that block. An attempted read from a read-locked block will result in the
data 00h. The read lock status can be unlocked by clearing the read lock bit: this can only be done pro-
vided that the block is not locked down. The current read lock status of a particular block can be deter-
mined by reading the corresponding read-lock bit.
?2011 Silicon Storage Technology, Inc.
24
DS25029A
06/11
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