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FM25040 Folha de dados(PDF) 5 Page - List of Unclassifed Manufacturers

Nome de Peças FM25040
Descrição Electrónicos  4Kb FRAM Serial Memory
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Ramtron
FM25040
11 May 2000
5/14
Data Transfer
All data transfers to and from the FM25040 occur in
8-bit groups. They are synchronized to the clock
signal (SCK) and occur most significant bit (MSB)
first. Serial inputs are clocked in on the rising edge
of SCK. Outputs are driven on the falling edge of
SCK.
Command Structure
There are six commands called op-codes that can be
issued by the bus master to the FM25040. 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, are commands
that have no subsequent operands. 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 Last are
commands for memory transactions followed by
address and one or more bytes of data.
Table 1. Op-code Commands
Name
Description
Op-code value
WREN
Set Write Enable Latch
00000110
WRDI
Write Disable
00000100
RDSR
Read Status Register
00000101
WRSR
Write Status Register
00000001
READ
Read Memory Data
0000A011
WRITE
Write Memory Data
0000A010
WREN - Set Write Enable Latch
The FM25040 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 affect. Completing any write operation (rising
edge of /CS) will automatically clear the Write
Enable Latch and prevent further writes without
another WREN command. Figure 4 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 5
below
illustrates
the
WRDI
command
bus
configuration.
Figure 4. WREN Bus Configuration
Figure 5. WRDI Bus Configuration


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