FM3104-G 查看數據表（PDF） - Ramtron International Corporation

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FM3104-G

(FM3104 - FM31256) Integrated Processor Companion with Memory

Ramtron International Corporation 

Start

By Master

S

Slave Address 0 A

Address

Address MSB

A

Address LSB

Start

Address

AS

Slave Address 1 A

By FM31xxx

Acknowledge

Figure 18. Selective (Random) Memory Read

FM3104/16/64/256

No

Acknowledge

Stop

Data Byte

1P

Data

By Master

Start

Address & Data

S

Slave Address 0 A 0 0 0 Address A

Data Byte

Stop

AP

By FM31xx

Acknowledge

Figure 19. Byte Register Write

2- Although not required, it is recommended that A5-A7 in the Register Address byte are zeros in

order to preserve compatibility with future devices.

Addressing FRAM Array in the FM31xx Family

The FM31xx family includes 256Kb, 64Kb, 16Kb, and 4Kb memory densities. The following 2-byte address field is

shown for each density.

Table 4. Two-Byte Memory Address

Part #

1st Address Byte

FM31256

x A14 A13 A12 A11 A10 A9 A8

FM3164

xx

x A12 A11 A10 A9 A8

FM3116

xx

x

x

x A10 A9 A8

FM3104

xx

x

x

x

x x A8

Note: The FM3116 and FM3104 are no longer available.

2nd Address Byte

A7 A6 A5 A4 A3 A2 A1 A0

A7 A6 A5 A4 A3 A2 A1 A0

A7 A6 A5 A4 A3 A2 A1 A0

A7

A6 A5 A4 A3 A2 A1 A0

Rev. 2.1

Sept. 2011

Page 20 of 26

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