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X24F032S Datasheet(PDF) 10 Page - Xicor Inc.

Part # X24F032S
Description  SerialFlash TM Memory with Block Lock TM Protection
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Manufacturer  XICOR [Xicor Inc.]
Direct Link  http://www.xicor.com
Logo XICOR - Xicor Inc.

X24F032S Datasheet(HTML) 10 Page - Xicor Inc.

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X24F064/032/016
10
Block Lock Bits
The Block Lock Bits BL0 and BL1 determine which
blocks of the memory are write-protected:
Table 1. Block Lock Bits
6686 FRM T02
BL1
BL0
Array Locked
0
0
None
0
1
Upper 1/4
1
0
Upper 1/2
1
1
Full Array (WPR not included)
Programmable Hardware Program Protect
The Program Protect (PP) pin and the Program Protect
Enable (PPEN) bit in the Program Protect Register
control the programmable hardware program protect
feature. Hardware program protection is enabled when
the PP pin and the PPEN bit are both
HIGH, and
disabled when either the PP pin is LOW or the PPEN
bit is LOW. When the chip is hardware program-
protected,
nonvolatile
programming
is
disabled,
including the Program Protect Register, the BL bits and
the PPEN bit itself, as well as to Block Locked sections
in the memory array. Only the sections of the memory
array that are not Block Locked can be written. Note
that since the PPEN bit is program-protected, it cannot
be changed back to a LOW state, and program protec-
tion is disabled as long as the PP pin is held HIGH.
Table 2 defines the program protection status for each
state of PPEN and PP.
Table 2. Program Protect Status Table
6686 FRM T03
PP
PPEN
Memory Array
(Not Block Locked)
Memory Array
(Block Locked)
BL Bits
PPEN Bit
0
X
Programmable
Locked
Programmable
Programmable
X
0
Programmable
Locked
Programmable
Programmable
1
1
Programmable
Locked
Locked
Locked


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