Agilent Technologies VXI E1439 - Manual (Page 57)

47
Using the Agilent E1439
Fiber Optic Interface
Raw
The Raw fiber mode transmits raw (i.e., unprocessed, full bandwidth) ADC data over the fiber
interface. At the same time that the raw data is transmitted over the fiber interface, filtered ADC
data can be sent over the local bus (Agilent E1439D only) or read from the FIFO via the VME
bus. After selecting Raw, optical data transmission starts at the trigger event and is not affected by
trigger delays or data delays. The raw data transmission continues even after the measurement is
complete. Changing the fiber mode stops data transmission. See the following illustration.
Note
Setting the data port to Fiber while in the Raw fiber mode results in an invalid instrument state
because raw and filtered data cannot both be sent over the fiber interface at the same time.
Fiber Interface Setup
Fiber Mode Raw
Rate
106 1 or 250 MBs
1. Only with external sam-
ple. Internal sample gen-
erates data too fast for
this rate.
BOF Optional
CRC ON 2
2. Some receivers may
require CRC to be off
for compatibility
Flow Control Optional
Epoch Generate Optional
Epoch Size Divisible by 4
Fiber TX Fiber RX
VME BUS
LBUS
ADC
DIGITAL
FILTERS
FIFO
E1438D / E1439D
FIFO
1 KB