FM25CL04-S datasheet(7/12 Pages) RAMTRON

Nome de Peças	FM25CL04-S

Descrição Electrónicos	4Kb FRAM Serial 3V Memory

Download	12 Pages

Scroll/Zoom	100%

Fabricante Electrônico	RAMTRON [Ramtron International Corporation]

Página de início	http://www.ramtron.com

Logo

7 / 12 page

N

O

T

R

EC

O

M

ME

N

D

ED

FO

R

N

EW

D

ES

IG

N

S

R

ep

la

ce

d

by

FM

25

L0

4

Rev. 3.1

May 2005

Page 7 of 12

Table 3. Block Memory Write Protection

BP1

BP0

Protected Address Range

0

None

0

1

180h to 1FFh (upper ¼)

1

0

100h to 1FFh (upper ½)

1

000h to 1FFh (all)

The BP1 and BP0 bits allow software to selectively

write protect the array. These settings are only used

when the /WP pin is inactive and the WREN

command has been issued. The following table

summarizes the write protection conditions.

Table 4. Write Protection

WEL

/WP

Protected Blocks

Unprotected Blocks

Status Register

0

X

Protected

1

0

Protected

1

Protected

Unprotected

Memory Operation

The SPI interface, which is capable of a relatively

high clock frequency, highlights the fast write

capability of the FRAM technology. Unlike SPI-bus

EEPROMs, the FM25CL04 can perform sequential

writes at bus speed. No page register is needed and

any number of sequential writes may be performed.

Write Operation

All writes to the memory array begin with a WREN

op-code. The next op-code is the WRITE instruction.

This op-code must include the address MSB. It is

followed by a single byte address value. In total, the

9-bits specify the address of the first byte of the write

operation. Subsequent bytes are data and they are

written sequentially. Addresses are incremented

internally as long as the bus master continues to issue

clocks. If the last address of 1FFh is reached, the

counter will roll over to 000h. Data is written MSB

first. A write operation is shown in Figure 9.

Unlike EEPROMs, any number of bytes can be

written sequentially and each byte is written to

memory immediately after it is clocked in (after the

8

th

clock). The rising edge of /CS terminates a

WRITE op-code operation. Asserting /WP active in

the middle of a write operation will have no effect

until the byte being written has completed.

Read Operation

After the falling edge of /CS, the bus master can issue

a READ op-code. This op-code must include the

address MSB. It is followed by a single byte address

value. In total, the 9-bits specify the address of the

first byte of the read operation. After the op-code and

address are complete, the SI line is ignored. The bus

master issues 8 clocks, with one bit read out for each.

Addresses are incremented internally as long as the

bus master continues to issue clocks. If the last

address of 1FFh is reached, the counter will roll over

to 000h. Data is read MSB first. The rising edge of

/CS terminates a READ op-code operation. A read

operation is shown in Figure 10.

Hold

The /HOLD pin can be used to interrupt a serial

operation without aborting it. If the bus master pulls

the /HOLD pin low while SCK is low, the current

operation will pause. Taking the /HOLD pin high

while SCK is low will resume an operation. The

transitions of /HOLD must occur while SCK is low,

but the SCK and /CS pins can toggle during a hold

state.

Figure 9. Memory Write

Nº de peça semelhante - FM25CL04-S

Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
List of Unclassifed Man...	FM25CL04-S	98Kb / 11P	4Kb FRAM Serial 3V Memory

More results

Descrição semelhante - FM25CL04-S

Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
List of Unclassifed Man...	FM25CL04	98Kb / 11P	4Kb FRAM Serial 3V Memory
	FM25L04	187Kb / 12P	4Kb FRAM Serial 3V Memory
	FM25040	631Kb / 14P	4Kb FRAM Serial Memory
	FM24CL04	119Kb / 12P	4Kb FRAM Serial Memory
Ramtron International C...	FM24CL04	116Kb / 11P	4Kb FRAM Serial Memory
Ramtron International C...	FM25040A	141Kb / 13P	4Kb FRAM Serial Memory
List of Unclassifed Man...	FM24C04A	100Kb / 12P	4Kb FRAM Serial Memory
Ramtron International C...	FM24C04A	98Kb / 12P	4Kb FRAM Serial Memory
	FM25L512	163Kb / 13P	512Kb FRAM Serial 3V Memory
	FM25L16	146Kb / 14P	16Kb FRAM Serial 3V Memory

More results

FM25CL04-S Folha de dados(PDF) 7 Page - Ramtron International Corporation

FM25CL04-S Folha de dados(HTML) 7 Page - Ramtron International Corporation

Nº de peça semelhante - FM25CL04-S

Descrição semelhante - FM25CL04-S

Html Pages

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

Folha de dados Download

Ligação URL