Electronic component search and free download site.
Transistors,MosFET ,Diode,Integrated circuits

W39V040FC View Datasheet(PDF) - Winbond

Part NameDescriptionManufacturer
W39V040FC 512K X 8 CMOS FLASH MEMORY WITH FWH INTERFACE Winbond
Winbond Winbond
W39V040FC Datasheet PDF : 36 Pages
First Prev 11 12 13 14 15 16 17 18 19 20 Next Last
W39V040FC
Block Locking Register Bits Function Table
BIT
7–3
2
1
0
FUNCTION
Reserved
Read Lock
1: Prohibit to read in the block where set
0: Normal read operation in the block where clear. This is default state.
Lock Down
1: Prohibit further to set or clear the Read Lock or Write Lock bits. This Lock Down
Bit can only be set not clear. Only the device is reset or re-powered, the Lock Down
Bit is cleared.
0: Normal operation for Read Lock or Write Lock. This is the default state.
Write Lock
1: Prohibited to write in the block where set. This is default state.
0: Normal programming/erase operation in the block where clear.
7.4 Register Based Block Locking Value Definitions Table
BIT [7:3]
00000
00000
00000
00000
00000
00000
00000
00000
BIT 2
0
0
0
0
1
1
1
1
BIT 1
0
0
1
1
0
0
1
1
BIT 0
0
1
0
1
0
1
0
1
RESULT
Full Access.
Write Lock. Default State.
Locked Open (Full Access, Lock Down).
Write Locked, Locked Down.
Read Locked.
Read & Write Locked.
Read Locked, Locked Down.
Read & Write Locked, Locked Down.
7.5 Read Lock
Any attempt to read the data of read locked block will result in “00H.” The default state of any block is
unlocked upon power up. User can clear or set the write lock bit anytime as long as the lock down bit is
not set.
7.6 Write Lock
This is the default state of blocks upon power up. Before any program or erase to the specified block,
user should clear the write lock bit first. User can clear or set the write lock bit anytime as long as the
lock down bit is not set. The write lock function is in conjunction with the hardware protect pins, #WP &
TBL. When hardware protect pins are enabled, it will override the register block locking functions and
write lock the blocks no matter how the status of the register bits. Reading the register bit will not reflect
the status of the #WP or #TBL pins.
7.7 Lock Down
The default state of lock down bit for any block is unlocked. This bit can be set only once; any further
attempt to set or clear is ignored. Only the reset from #RESET or #INIT can clear the lock down bit.
Once the lock down bit is set for a block, then the write lock bit & read lock bit of that block will not be
set or cleared, and keep its current state.
- 12 -
Direct download click here

 

Share Link : 
All Rights Reserved© datasheetq.com 2015 - 2020  ] [ Privacy Policy ] [ Request Datasheet  ] [ Contact Us ]