W39V040FB Datasheet, PDF (10/33 Pages) Winbond – 512K X 8 CMOS FLASH MEMORY WITH FWH INTERFACE

W39V040FB
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.
7.8 Product Identification Registers
In the FWH interface mode, a read from FFBC, 0000(hex) can output the manufacturer code, DA(hex).
A read from FFBC,0001(hex) can output the device code 54(hex).
There is an alternative software method (six commands bytes) to read out the Product Identification in
both the Programmer interface mode and the FWH interface mode. Thus, the programming equipment
can automatically matches the device with its proper erase and programming algorithms.
In the software access mode, a six-byte (or JEDEC 3-byte) command sequence can be used to
access the product ID for programmer interface mode. A read from address 0000(hex) outputs the
manufacturer code, DA(hex). A read from address 0001(hex) outputs the device code, 54(hex). The
product ID operation can be terminated by a three-byte command sequence or an alternate one-byte
command sequence (see Command Definition table for detail).
8. TABLE OF OPERATING MODES
8.1 Operating Mode Selection - Programmer Mode
MODE
Read
Write
Standby
Write Inhibit
Output Disable
#OE
VIL
VIH
X
VIL
X
VIH
#WE
VIH
VIL
X
X
VIH
X
#RESET
VIH
VIH
VIL
VIH
VIH
VIH
PINS
ADDRESS
AIN
AIN
X
X
X
X
DQ.
Dout
Din
High Z
High Z/DOUT
High Z/DOUT
High Z
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