Motor de Búsqueda de Datasheet de Componentes Electrónicos
  Spanish  ▼
ALLDATASHEET.ES

X  

FM25640C-G Datasheet(PDF) 6 Page - Ramtron International Corporation

No. de pieza FM25640C-G
Descripción Electrónicos  64Kb Serial 5V F-RAM Memory
Download  13 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrónico  RAMTRON [Ramtron International Corporation]
Página de inicio  http://www.ramtron.com
Logo RAMTRON - Ramtron International Corporation

FM25640C-G Datasheet(HTML) 6 Page - Ramtron International Corporation

Back Button FM25640C-G Datasheet HTML 2Page - Ramtron International Corporation FM25640C-G Datasheet HTML 3Page - Ramtron International Corporation FM25640C-G Datasheet HTML 4Page - Ramtron International Corporation FM25640C-G Datasheet HTML 5Page - Ramtron International Corporation FM25640C-G Datasheet HTML 6Page - Ramtron International Corporation FM25640C-G Datasheet HTML 7Page - Ramtron International Corporation FM25640C-G Datasheet HTML 8Page - Ramtron International Corporation FM25640C-G Datasheet HTML 9Page - Ramtron International Corporation FM25640C-G Datasheet HTML 10Page - Ramtron International Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 6 / 13 page
background image
FM25640C - 64Kb 5V SPI F-RAM
Rev. 1.1
June 2011
6 of 13
RDSR - Read Status Register
The RDSR command allows the bus master to verify
the contents of the Status register. Reading Status
provides information about the current state of the
write protection features. Following the RDSR op-
code, the FM25640C will return one byte with the
contents of the Status register. The Status register is
described in detail below.
WRSR – Write Status Register
The WRSR command allows the user to select
certain write protection features by writing a byte to
the Status register. Prior to issuing a WRSR
command, the /WP pin must be high or inactive. Note
that on the FM25640C, /WP only prevents writing to
the Status register, not the memory array. Prior to
sending the WRSR command, the user must send a
WREN command to enable writes. Note that
executing a WRSR command is a write operation and
therefore clears the Write Enable Latch. The bus
configuration of RDSR and WRSR in the timing
diagrams below.
Figure 7. RDSR Bus Configuration
Figure 8. WRSR Bus Configuration
Status Register & Write Protection
The write protection features of the FM25640C are
multi-tiered. First, a WREN op-code must be issued
prior to any write operation. Assuming that writes are
enabled using WREN,
writes to
memory are
controlled by the Status register. As described above,
writes to the status register are performed using the
WRSR command and subject to the /WP pin. The
Status Register is organized as follows.
Table 2. Status Register
Bit
7
6
5
4
3
2
1
0
Name
WPEN
0
0
0
BP1
BP0
WEL
0
Bits 0 and 4-6 are fixed at 0 and cannot be modified.
Note that bit 0 (Ready in EEPROMs) is unnecessary
as the F-RAM writes in real-time and is never busy.
The WPEN, BP1 and BP0 control write protection
features. They are nonvolatile (shaded yellow). The
WEL flag indicates the state of the Write Enable
Latch. This bit is internally set by the WREN
command and is cleared by terminating a write cycle
(/CS high) or by using the WRDI command.
BP1 and BP0 are memory block write protection bits.
They specify portions of memory that are write-
protected as shown in the following table.
Table 3. Block Memory Write Protection
BP1
BP0
Protected Address Range
0
0
None
0
1
1800h to 1FFFh (upper ¼)
1
0
1000h to 1FFFh (upper ½)
1
1
0000h to 1FFFh (all)


Número de pieza similar - FM25640C-G

Fabricante ElectrónicoNo. de piezaDatasheetDescripción Electrónicos
logo
Ramtron International C...
FM25640 RAMTRON-FM25640 Datasheet
131Kb / 14P
   64Kb FRAM Serial Memory
FM25640 RAMTRON-FM25640 Datasheet
187Kb / 13P
   64Kb FRAM Serial Memory
FM25640 RAMTRON-FM25640 Datasheet
138Kb / 13P
   64Kb FRAM Serial Memory
FM25640-G RAMTRON-FM25640-G Datasheet
187Kb / 13P
   64Kb FRAM Serial Memory
FM25640-GA RAMTRON-FM25640-GA Datasheet
138Kb / 13P
   64Kb FRAM Serial Memory
More results

Descripción similar - FM25640C-G

Fabricante ElectrónicoNo. de piezaDatasheetDescripción Electrónicos
logo
Cypress Semiconductor
FM24C64B CYPRESS-FM24C64B_13 Datasheet
352Kb / 15P
   64Kb Serial 5V F-RAM Memory
logo
Ramtron International C...
FM25640B RAMTRON-FM25640B Datasheet
213Kb / 13P
   64Kb Serial 5V F-RAM Memory
FM24C64B RAMTRON-FM24C64B Datasheet
293Kb / 12P
   64Kb Serial 5V F-RAM Memory
FM24C64C RAMTRON-FM24C64C Datasheet
274Kb / 12P
   64Kb Serial 5V F-RAM Memory
logo
Cypress Semiconductor
FM24C64B CYPRESS-FM24C64B Datasheet
347Kb / 12P
   64Kb Serial 5V F-RAM Memory
FM25640B-G CYPRESS-FM25640B-G Datasheet
441Kb / 13P
   64Kb Serial 5V F-RAM Memory
FM25640B CYPRESS-FM25640B Datasheet
441Kb / 13P
   64Kb Serial 5V F-RAM Memory
FM25640B CYPRESS-FM25640B_13 Datasheet
400Kb / 14P
   64Kb Serial 5V F-RAM Memory
FM1608B CYPRESS-FM1608B Datasheet
342Kb / 14P
   64Kb Bytewide 5V F-RAM Memory
logo
Ramtron International C...
FM1608B RAMTRON-FM1608B Datasheet
94Kb / 11P
   64Kb Bytewide 5V F-RAM Memory
More results


Html Pages

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


Datasheet Descarga

Go To PDF Page


Enlace URL




Política de Privacidad
ALLDATASHEET.ES
¿ALLDATASHEET es útil para Ud.?  [ DONATE ] 

Todo acerca de Alldatasheet   |   Publicidad   |   Contáctenos   |   Política de Privacidad   |   Intercambio de Enlaces   |   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