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X25F016VI-5 Datasheet(PDF) 3 Page - Xicor Inc.

Part # X25F016VI-5
Description  SerialFlash??Memory With Block LockTM Protection
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Manufacturer  XICOR [Xicor Inc.]
Direct Link  http://www.xicor.com
Logo XICOR - Xicor Inc.

X25F016VI-5 Datasheet(HTML) 3 Page - Xicor Inc.

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X25F064/032/016/008
3
formatted as follows:
PPEN, BL0, and BL1 are set by the PRSR instruction.
PEL and PIP are “read-only” and automatically set by
other operations.
The Programming-In-Process (PIP) bit indicates
whether the X25F064/032/016/008 device is busy
with a program operation. When set to a “1”
programming is in progress, when set to a “0” no
programming is in progress. During programming, all
other bits are set to “1”.
The Program Enable Latch (PEL) bit indicates the
status of the program enable latch. When set to a “1” the
latch is set; when set to a “0” the latch is reset.
The Block Lock (BL0 and BL1) bits are nonvolatile and
allow the user to select one of four levels of protection.
The X25F064/032/016/008 device array is divided into
four equal segments. One, two, or all four of the seg-
ments may be locked. That is, the user may read the
segments, but will be unable to alter (program) data
within the selected segments. The partitioning is con-
trolled as illustrated below.
Status Register Bits
Array Addresses
BL1
BL0
Locked
0
0
None
0
1
upper fourth
1
0
upper half
1
1
All
6685 PGM T03.1
Program-Protect Enable
The Program-Protect-Enable bit (PPEN) in the
X25F064/032/016/008 status register acts as an
enable bit for the
PP pin.
PRINCIPLES OF OPERATION
The X25F064/032/016/008 family are SerialFlash
Memory designed to interface directly with the synchro-
nous serial peripheral interface (SPI) of many popular
microcontroller families.
The X25F064/032/016/008 family contains an 8-bit
instruction register. It is accessed via the SI input, with
data being clocked in on the rising SCK.
CS must be
LOW and the
HOLD and PP inputs must be HIGH during
the entire operation. The
PP input is “Don’t Care” if
PPEN is set “0”.
Table 1 contains a list of the instructions and their
operation codes. All instructions, addresses and data
are transferred MSB first.
Data input is sampled on the first rising edge of SCK after
CS goes LOW. SCK is static, allowing the user to stop
the clock and then resume operations. If the clock line is
shared with other peripheral devices on the SPI bus, the
user can assert the
HOLD input to place the X25F064/
032/016/008 into a “PAUSE” condition. After
releasing
HOLD, the X25F064/032/016/008 device will
resume operation from the point when
HOLD was first
asserted.
Program Enable Latch
The X25F064/032/016/008 device contains a
program enable latch. This latch must be SET before a
program operation will be completed internally. The
PREN instruction will set the latch and the PRDI
instruction will reset the latch. This latch is automatically
reset on power-up and after the completion of a sector
program or status register write cycle.
Status Register
The RDSR instruction provides access to the status
register. The status register may be read at any time,
even during a program cycle. The status register is
7
654
3
2
1
0
PPEN
X
X
X
BL1
BL0
PEL
PIP
6685 PGM T02.2
Table 1. Instruction Set
Instruction Name
Instruction Format*
Operation
PREN
0000 0110
Set the Program Enable Latch (Enable Program Operations)
PRDI
0000 0100
Reset the Program Enable Latch (Disable Program Operations)
RDSR
0000 0101
Read Status Register
PRSR
0000 0001
Program Status Register
READ
0000 0011
Read from Memory Array beginning at Selected Address
PROGRAM
0000 0010
Program Memory Array beginning at Selected Address
(32 Bytes)
6685 PGM T04.2
*Instructions are shown MSB in leftmost position. Instructions are transferred MSB first.


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