FM6124 Ramtron Corporation, FM6124 Datasheet - Page 8

• Manufacturer Part Number: FM6124
• Description: Event Data Recorder With F-ram
• Manufacturer: Ramtron Corporation

Delay When Switching from EDR/Companion ID
to User F-RAM ID
When switching from FM6124 EDR/Companion ID
to the User F-RAM ID, there will be a delay of
~100µs during which the FM6124 may not
acknowledge to I
required for the internal logic of the FM6124 to
perform the switchover from one ID to another.
If the host attempts to initiate a transaction to the
FM6124 with a different slave address within this
Rev. 4.0 (EOL)
July 2010
By Master
By FM6124
By FM6124
By Master
Start
S
Slave Address
2
C ID sent to it.
Start
S
0
A
Slave Address
Address MSB
F
Address
IGURE
This delay is
F
9. S
IGURE
0
ELECTIVE
A
10. B
A
Address LSB
Acknowledge
YTE
Register Address
(R
Address & Data
ANDOM
R
EGISTER
100µs period, it is recommended that the host initiate
a read command to the FM6124 with the ID projected
to be used with the R/W bit set to 1 and then send a
STOP if the FM6124 fails to respond.
At 100 kHz I
correspond to approximately one I
This means that if the FM6124 fails to respond to the
first read operation, it will respond on the second one.
) M
A
EMORY
W
Start
S
RITE
Acknowledge
Slave Address
R
2
C communication speed a 100µS delay
Address
EAD
A
1
A
Data Byte
Data Byte
Data
2
C read command.
Acknowledge
No
A
1 P
Page 8 of 53
P
Stop
Stop