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FM25L16 датащи(PDF) 5 Page - Ramtron International Corporation

номер детали FM25L16
подробное описание детали  16Kb FRAM Serial 3V Memory
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производитель  RAMTRON [Ramtron International Corporation]
домашняя страница  http://www.ramtron.com
Logo RAMTRON - Ramtron International Corporation

FM25L16 датащи(HTML) 5 Page - Ramtron International Corporation

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FM25L16
Rev. 3.0
Aug. 2006
Page 5 of 14
Data Transfer
All data transfers to and from the FM25L16 occur in
8-bit groups. They are synchronized to the clock
signal (SCK), and they transfer most significant bit
(MSB) first. Serial inputs are registered on the rising
edge of SCK. Outputs are driven from the falling
edge of SCK.
Command Structure
There are six commands called op-codes that can be
issued by the bus master to the FM25L16. They are
listed in the table below. These op-codes control the
functions performed by the memory. They can be
divided
into
three
categories.
First,
there
are
commands that have no subsequent operations. They
perform a single function such as to enable a write
operation. Second are commands followed by one
byte, either in or out. They operate on the status
register. The third group includes commands for
memory transactions followed by an address and one
or more bytes of data.
Table 1. Op-code Commands
Name
Description
Op-code
WREN
Set Write Enable Latch
0000 0110b
WRDI
Write Disable
0000 0100b
RDSR
Read Status Register
0000 0101b
WRSR
Write Status Register
0000 0001b
READ
Read Memory Data
0000 0011b
WRITE
Write Memory Data
0000 0010b
WREN - Set Write Enable Latch
The FM25L16 will power up with writes disabled.
The WREN command must be issued prior to any
write operation. Sending the WREN op-code will
allow the user to issue subsequent op-codes for
write operations. These include writing the status
register and writing the memory.
Sending the WREN op-code causes the internal
Write Enable Latch to be set. A flag bit in the status
register, called WEL, indicates the state of the latch.
WEL=1
indicates
that
writes
are
permitted.
Attempting to write the WEL bit in the status
register has no effect. Completing any write
operation will automatically clear the write-enable
latch and prevent further writes without another
WREN command. Figure 5 below illustrates the
WREN command bus configuration.
WRDI - Write Disable
The WRDI command disables all write activity by
clearing the Write Enable Latch. The user can verify
that writes are disabled by reading the WEL bit in
the status register and verifying that WEL=0. Figure
6 illustrates the WRDI command bus configuration.
Figure 5. WREN Bus Configuration
Figure 6. WRDI Bus Configuration


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