fm3204 Ramtron Corporation, fm3204 Datasheet - Page 16

• Manufacturer Part Number: fm3204
• Description: Integrated Processor Companion With Memory
• Manufacturer: Ramtron Corporation

Addressing FRAM Array in the FM32xx Family
The FM32xx 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
Rev. 2.4
Mar. 2008
Part #
By Master
By FM32xx
By FM32xx
By Master
FM32256
FM3264
FM3216
FM3204
Start
S
Slave Address
* Although not required, it is recommended that A5-A7 in the Register Address byte are
Start
x
x
x
x
S
A14
x
x
x
0
A
Slave Address
zeros in order to preserve compatibility with future devices.
A13
x
x
x
Figure 14. Selective (Random) Memory Read
Address MSB
1
Address
st
Address Byte
A12
A12
x
x
Figure 15. Byte Register Write
A11
A11
x
x
0
A
A
A10
A10
A10
x
Address LSB
0 0 0
Acknowledge
Address & Data
A9
A9
A9
x
A8
A8
A8
A8
Address
A
Start
S
A7
A7
A7
A7
Acknowledge
Slave Address
Address
A6
A6
A6
A6
A
A5
A5
A5
A5
2
nd
1
Address Byte
A
Data Byte
A4
A4
A4
A4
A3
A3
A3
A3
Data Byte
FM3204/16/64/256
Data
A2
A2
A2
A2
Acknowledge
A1
A1
A1
A1
Page 16 of 22
No
A
1 P
A0
A0
A0
A0
P
Stop
Stop