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FM24C16A データシート(PDF) 5 Page - Ramtron International Corporation

部品番号 FM24C16A
部品情報  16Kb FRAM Serial Memory
Download  12 Pages
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メーカー  RAMTRON [Ramtron International Corporation]
ホームページ  http://www.ramtron.com
Logo RAMTRON - Ramtron International Corporation

FM24C16A データシート(HTML) 5 Page - Ramtron International Corporation

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FM24C16A
Rev 3.0
Mar. 2005
Page 5 of 12
1
0
1
0
A2
A1
A0
R/W
Slave ID
Page
Select
Figure 4. Slave Address
Word Address
After the FM24C16A (as receiver) acknowledges the
slave ID, the master will place the word address on
the bus for a write operation. The word address is the
lower 8-bits of the address to be combined with the 3-
bits of the page select to specify the exact byte to be
written. The complete 11-bit address is latched
internally.
No word address occurs for a read operation, though
the 3-bit page select is latched internally. Reads
always use the lower 8-bits that are held internally in
the address latch. That is, reads always begin at the
address following the previous access. A random read
address can be loaded by doing a write operation as
explained below.
After transmission of each data byte, just prior to the
acknowledge, the FM24C16A increments the internal
address latch. This allows the next sequential byte to
be accessed with no additional addressing. After the
last address (7FFh) is reached, the address latch will
roll over to 000h. There is no limit on the number of
bytes that can be accessed with a single read or write
operation.
Data Transfer
After all address information has been transmitted,
data transfer between the bus master and the
FM24C16A can begin. For a read operation the
device will place 8 data bits on the bus then wait for
an acknowledge. If the acknowledge occurs, the next
sequential
byte
will
be
transferred.
If
the
acknowledge is not sent, the read operation is
concluded. For a write operation, the FM24C16A will
accept 8 data bits from the master then send an
acknowledge. All data transfer occurs MSB (most
significant bit) first.
Memory Operation
The FM24C16A is designed to operate in a manner
very similar to other 2-wire interface memory
products. The major differences result from the
higher
performance write capability of FRAM
technology. These improvements result in some
differences between the FM24C16A and a similar
configuration EEPROM during writes. The complete
operation for both writes and reads is explained
below.
Write Operation
All writes begin with a slave ID then a word address
as previously mentioned. The bus master indicates a
write operation by setting the LSB of the Slave
Address to a 0. After addressing, the bus master sends
each byte of data to the memory and the memory
generates an acknowledge condition. Any number of
sequential bytes may be written. If the end of the
address range is reached internally, the address
counter will wrap from 7FFh to 000h.
Unlike other nonvolatile memory technologies, there
is no write delay with FRAM. The entire memory
cycle occurs in less time than a single bus clock.
Therefore, any operation including read or write can
occur immediately following a write. Acknowledge
polling,
a
technique
used
with
EEPROMs
to
determine if a write is complete is unnecessary and
will always return a ‘ready’ condition.
An actual memory array write occurs after the 8
th data
bit is transferred. It will be complete before the
acknowledge is sent. Therefore, if the user desires to
abort a write without altering the memory contents,
this should be done using start or stop condition prior
to the 8
th data bit. The FM24C16A needs no page
buffering.
The memory array can be write protected using the
WP pin. Setting the WP pin to a high condition
(VDD)
will
write-protect
all
addresses.
The
FM24C16A will not acknowledge data bytes that are
written to protected addresses. In addition, the
address counter will not increment if writes are
attempted to these addresses. Setting WP to a low
state (VSS) will deactivate this feature.
Figure 5 and 6 below illustrates both a single-byte
and multiple-byte writes.


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