FM25H20 datasheet(6/15 Pages) RAMTRON

Teilenummer	FM25H20

Bauteilbeschribung	2Mb Serial 3V F-RAM Memory

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Hersteller	RAMTRON [Ramtron International Corporation]

Direct Link	http://www.ramtron.com

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6 / 15 page

FM25H20 - 2Mb SPI FRAM

Rev. 2.2

Sept. 2010

Page 6 of 15

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Figure 6. WRDI Bus Configuration

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 FM25H20 will return one byte with the

contents of the Status Register. The Status Register is

described in detail in the section 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 /W pin must be high or inactive. 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 are shown

below.

Figure 7. RDSR Bus Configuration

Figure 8. WRSR Bus Configuration

Status Register & Write Protection

The write protection features of the FM25H20 are

multi-tiered. A WREN op-code must be issued prior

to writing the memory (WRITE) or Status Register

(WRSR). Protecting the Status Register can be

accomplished via software using the WPEN bit or

hardware using the /W pin. Status Register write

operations are blocked when the /W pin is low and

WPEN=1. Memory write operations are protected by

the block protect (BP) bits in the Status Register. The

state of the /W pin has no effect on memory writes.

As described above, writes to the Status Register are

performed using the WRSR command and subject to

the WPEN bit and /W pin. The Status Register is

organized as follows.

Table 2. Status Register

Bit

7

6

5

4

3

2

1

0

Name

WPEN

1

0

BP1

BP0

WEL

0

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Ähnliche Beschreibung - FM25H20

Hersteller	Teilenummer	Datenblatt	Bauteilbeschribung
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FM25H20 Datenblatt(PDF) 6 Page - Ramtron International Corporation

FM25H20 Datenblatt(HTML) 6 Page - Ramtron International Corporation

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Ähnliche Beschreibung - FM25H20

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