Os motores de busca de Datasheet de Componentes eletrônicos
  Portuguese  ▼
ALLDATASHEETPT.COM

X  

FM25CL64 Folha de dados(PDF) 3 Page - Ramtron International Corporation

Nome de Peças FM25CL64
Descrição Electrónicos  64Kb FRAM Serial 3V Memory
Download  13 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrônico  RAMTRON [Ramtron International Corporation]
Página de início  http://www.ramtron.com
Logo RAMTRON - Ramtron International Corporation

FM25CL64 Folha de dados(HTML) 3 Page - Ramtron International Corporation

  FM25CL64 Datasheet HTML 1Page - Ramtron International Corporation FM25CL64 Datasheet HTML 2Page - Ramtron International Corporation FM25CL64 Datasheet HTML 3Page - Ramtron International Corporation FM25CL64 Datasheet HTML 4Page - Ramtron International Corporation FM25CL64 Datasheet HTML 5Page - Ramtron International Corporation FM25CL64 Datasheet HTML 6Page - Ramtron International Corporation FM25CL64 Datasheet HTML 7Page - Ramtron International Corporation FM25CL64 Datasheet HTML 8Page - Ramtron International Corporation FM25CL64 Datasheet HTML 9Page - Ramtron International Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 3 / 13 page
background image
FM25CL64
Rev. 2.1
Apr. 2003
Page 3 of 13
Overview
The FM25CL64 is a serial FRAM memory. The
memory array is logically organized as 8,192 x 8 and
is accessed
using an industry standard Serial
Peripheral Interface or SPI bus. Functional operation
of the FRAM is similar to serial EEPROMs. The
major difference between the FM25CL64 and a serial
EEPROM with the same pinout is the FRAM’s
superior write performance.
Memory Architecture
When accessing the FM25CL64, the user addresses
8,192 locations of 8 data bits each. These data bits
are shifted serially. The addresses are accessed using
the SPI protocol, which includes a chip select (to
permit multiple devices on the bus), an op-code, and
a two-byte address. The upper 3 bits of the address
range are ‘don’t care’ values. The complete address
of 13-bits specifies each byte address uniquely.
Most
functions
of
the
FM25CL64
either
are
controlled by the SPI interface or are handled
automatically by on-board circuitry. The access time
for memory operation is essentially zero, beyond the
time needed for the serial protocol. That is, the
memory is read or written at the speed of the SPI bus.
Unlike an EEPROM, it is not necessary to poll the
device for a ready condition since writes occur at bus
speed. So, by the time a new bus transaction can be
shifted into the device, a write operation will be
complete. This is explained in more detail in the
interface section.
Users expect several obvious system benefits from
the FM25CL64 due to its fast write cycle and high
endurance as compared with EEPROM. In addition
there are less obvious benefits as well. For example
in a high noise environment, the fast-write operation
is less susceptible to corruption than an EEPROM
since it is completed quickly. By contrast, an
EEPROM
requiring
milliseconds
to
write
is
vulnerable to noise during much of the cycle.
Note
that
the
FM25CL64
contains
no
power
management circuits other than a simple internal
power-on reset. It is the user’s responsibility to
ensure that VDD is within datasheet tolerances to
prevent incorrect operation.
Serial Peripheral Interface – SPI Bus
The
FM25CL64
employs
a
Serial
Peripheral
Interface (SPI) bus. It is specified to operate at speeds
up to 20 MHz. This high-speed serial bus provides
high performance serial communication to a host
microcontroller.
Many common
microcontrollers
have hardware SPI ports allowing a direct interface.
It is quite simple to emulate the port using ordinary
port pins for microcontrollers that do not. The
FM25CL64 operates in SPI Mode 0 and 3.
The SPI interface uses a total of four pins: clock,
data-in, data-out, and chip select. It is possible to
connect the two data pins together. Figure 2
illustrates a typical system configuration using the
FM25CL64 with a microcontroller that offers an SPI
port. Figure 3 shows a similar configuration for a
microcontroller that has no hardware support for the
SPI bus.
Protocol Overview
The SPI interface is a synchronous serial interface
using clock and data pins. It is intended to support
multiple devices on the bus. Each device is activated
using a chip select. Once chip select is activated by
the bus master, the FM25CL64 will begin monitoring
the clock and data lines. The relationship between the
falling edge of /CS, the clock and data is dictated by
the SPI mode. The device will make a determination
of the SPI mode on the falling edge of each chip
select. While there are four such modes, the
FM25CL64 supports modes 0 and 3. Figure 4 shows
the required signal relationships for modes 0 and 3.
For both modes, data is clocked into the FM25CL64
on the rising edge of SCK and data is expected on the
first rising edge after /CS goes active. If the clock
begins from a high state, it will fall prior to beginning
data transfer in order to create the first rising edge.
The SPI protocol is controlled by op-codes. These
op-codes specify the commands to the device. After
/CS is activated the first byte transferred from the bus
master is the op-code. Following the op-code, any
addresses and data are then transferred.
Certain op-codes are commands with no subsequent
data transfer. The /CS must go inactive after an
operation is complete and before a new op-code can
be issued. There is one valid op-code only per active
chip select.


Nº de peça semelhante - FM25CL64

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
Ramtron International C...
FM25CL64 RAMTRON-FM25CL64 Datasheet
137Kb / 13P
   64Kb FRAM Serial 3V Memory
FM25CL64 RAMTRON-FM25CL64 Datasheet
7Mb / 28P
   VersaKit-30xx Development System Overview
Rev 2.0
FM25CL64-GA RAMTRON-FM25CL64-GA Datasheet
137Kb / 13P
   64Kb FRAM Serial 3V Memory
FM25CL64B RAMTRON-FM25CL64B Datasheet
307Kb / 14P
   64Kb Serial 3V F-RAM Memory
logo
Cypress Semiconductor
FM25CL64B CYPRESS-FM25CL64B Datasheet
509Kb / 14P
   64Kb Serial 3V F-RAM Memory
More results

Descrição semelhante - FM25CL64

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
Ramtron International C...
FM24CL64 RAMTRON-FM24CL64_07 Datasheet
115Kb / 13P
   64Kb Serial 3V FRAM Memory
FM25CL64 RAMTRON-FM25CL64_07 Datasheet
137Kb / 13P
   64Kb FRAM Serial 3V Memory
FM25640 RAMTRON-FM25640 Datasheet
131Kb / 14P
   64Kb FRAM Serial Memory
FM25640 RAMTRON-FM25640_05 Datasheet
187Kb / 13P
   64Kb FRAM Serial Memory
FM24C64 RAMTRON-FM24C64_05 Datasheet
98Kb / 12P
   64Kb FRAM Serial Memory
FM25640 RAMTRON-FM25640_07 Datasheet
138Kb / 13P
   64Kb FRAM Serial Memory
logo
List of Unclassifed Man...
FM24CL64 ETC-FM24CL64 Datasheet
96Kb / 13P
   64Kb 2.7V-3.6V FRAM Serial Memory
logo
Ramtron International C...
FM25L512 RAMTRON-FM25L512 Datasheet
163Kb / 13P
   512Kb FRAM Serial 3V Memory
FM25L16 RAMTRON-FM25L16_06 Datasheet
146Kb / 14P
   16Kb FRAM Serial 3V Memory
FM25L256B RAMTRON-FM25L256B Datasheet
148Kb / 14P
   256Kb FRAM Serial 3V Memory
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13


Folha de dados Download

Go To PDF Page


Ligação URL




Privacy Policy
ALLDATASHEETPT.COM
ALLDATASHEET é útil para você?  [ DONATE ] 

Sobre Alldatasheet   |   Publicidade   |   Contato conosco   |   Privacy Policy   |   roca de Link   |   Lista de Fabricantes
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com