Agilent Technologies E1439 manual BofEnablePtr crcEnable CrcEnablePtr fiberMode

bofEnablePtr crcEnable

crcEnablePtr fiberMode

Note

Note

Agilent E1439 Programmer's Reference

Functions listed alphabetically

AGE1439_BOF_OFF is the default setting. It blocks the transmission of all automatically generated BOF events. However, programmatically generated BOF events such as age1439_ fiber_xmt_BOF,whichareusedinthesynchronizationoffiberinterfaces,arenotblocked.

points to the current value of bofEnable.

determines whether or not cyclic redundancy checking (CRC) is performed on the fiber receiver and whether or not that information will be transmitted. Generally, cyclic redundancy checking should be enabled, but turning CRC off may solve compatibility problems with some fiber optic receivers.

AGE1439_CRC_ON enables CRC checking.

AGE1439_CRC_OFF disables CRC checking.

points to the current value of crcEnable.

is used to turn the fiber interface off, configure it to copy data from the receiver to the transmitter port without adding data, configure the transmission of filtered ADC data, or configure appending ADC data to received data.

AGE1439_FIBER_MODE_RAW allows the transmission of unfiltered full bandwidth ADC data at the same time filtered ADC data is available to read on the VME bus or the local bus.

AGE1439_FIBER_MODE_OFF turns off both the fiber transmitter and receiver (although PIO1, PIO2, NRDY and DIR bits are still received). Normal data collection and digital processing continues.

If age1439_data_port is set to fiber while the fiber interface is turned off, the data FIFO will fill up with filtered ADC data and collection will stop. In this case, age1439_meas_status_get will return the error, AGE1439_NO_DATA_MEASUREMENT_PAUSED.

AGE1439_FIBER_MODE_COPY is the default fiberMode at power-on and reset. Data is copied from the fiber interface receiver to the fiber interface transmitter while the module is performing other measurements. For instance, filtered ADC data can be sent on the LBUS or read from the FIFO over the VME bus in accordance with the current setting of the age1439_data_port function, with this parameter set. However, selecting fiber as the data port while using this mode will result in setting the AGE1439_STATUS_SETUP_ERROR bit in the status register. This occurs because the fiber interface cannot perform both functions at the same time.

The E1439D fiber receiver’s detect signal is used to activate the fiber transmitter. The E1439D fiber interface is not a data receiver. The function of the receive port is limited to copying data to the transmit port and to detecting FPDP control signals (e.g., PIO bits and flow control signals). Since signal detect works on light energy alone, there does not need to be valid data on the fiber receiver for there to be an output from the transmitter. If there is valid data present on the fiber receiver, it is copied to the fiber transmitter. This preserves data transparency but not necessarily protocol transparency. The outgoing protocol is always serial FPDP.

AGE1439_FIBER_MODE_RAW transmits unprocessed and unbuffered ADC data over the fiber interface. After selection, optical data transmission begins when the first measurement is triggered, and continues indefinitely after the measurement is complete. Transmission will continue until the fiber mode is changed to something other than AGE1439_FIBER_MODE_ RAW or a fiber error occurs. While this raw data is being transmitted, filtered ADC data can still be sent over the local bus, or read from the FIFO via the VME bus. Attempting to set AGE1439_

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