FM6124 Ramtron Corporation, FM6124 Datasheet - Page 16

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

Since the EDR's address register is auto-incrementing, it is
unnecessary to send the register address for each byte to be
read from the buffer.
reading at address 0x2C or to finish reading at address
0x33. The user is free to retrieve event data from the read
buffer as best suits their application.
If the single event read command issued was a GET, then
RP will be incremented or decremented as indicated by
DIR.
Rev. 4.0 (EOL)
July 2010
F
IGURE
Send Reg Address = 0x2C
Send Reg Address = 0x20
Send Command: GET or
Event Data byte Read
GETKEEP + set DIR
All 8 Bytes of event
Send I2C EDR ID
Send I2C EDR ID
Send I2C EDR ID
+ R/W = 0 (write)
+ R/W = 0 (write)
+ R/W = 1 (read)
Single Event Read
18. S
data Read?
I2C Start
I2C Stop
I2C Start
I2C Stop
I2C Start
I2C Stop
End
INGLE
E
VENT DATA
It is also unnecessary to begin
R
ETRIEVAL PROCESS
Step 1
Step 2
Step 3
If the single event command issued was a GET KEEP,
then RP will remain unchanged.
RETRIEVING MULTIPLE EVENTS
After a STREAMING GET or STREAMING GET KEEP
command has been issued, the EDR will place the event
pointed to by the SP pointer, into the read buffer. The
eight byte wide read buffer can be read through the I
serial port, starting at address 0x2C and finishing at
address 0x33. To retrieve an event from the buffer, the
following procedure should be followed.
Repeat until the desired number of events has been retrieved.
Start I
Send the EDR ID & [R/W] = 0 or write
Send the event buffer start address "0x2C"
Stop I
Start I
Send the EDR ID & [R/W] = 1 or read
Send seven addition read requests
Stop I
with Next/Previous Event data
Reload Event Data Registers
(This operation is automatically
performed by the FM6124)
2
2
2
2
C
C
C
C
F
IGURE
19. M
No
Multiple Events Read
ULTIPLE
Send Command: STREAM
Send Reg Address = 0x2C
Send Reg Address = 0x20
Event Data byte Read
Keep Reading Event?
Event Data Register
Send I2C EDR ID
Send I2C EDR ID
Send I2C EDR ID
+ R/W = 0 (write)
+ R/W = 0 (write)
+ R/W = 1 (read)
Yes
0x33 Read?
+ set DIR
I2C Start
I2C Stop
I2C Start
I2C Stop
I2C Start
I2C Stop
End
E
VENTS RETRIEVAL
Page 16 of 53
Step 1
Step 2
Step 3
2
C