Agilent Technologies E1439 manual Data type, BlocksizePtr, DataDelayPtr, DataType

Agilent E1439 Programmer's Reference

Functions listed alphabetically

AGE1439_BLOCKSIZE_MAX selects the maximum blocksize.

AGE1439_BLOCKSIZE_DEF sets the default blocksize.

The range of available block sizes depends on the number of bytes required for each sample. The command accepts any number between 2 and memory size (in bytes) × 2/3. If the requested block size falls outside the range shown in the table the previous valid value is used and a status register flag (bit 6) is set indicating a setup error. The blocksize is updated after the setup is changed to be valid.

For real data blocksize is the number of real data values per data block. For complex data blocksize is the number of complex data pairs per data block.

The following table summarizes the available block sizes for each setting of the dataType, and resolution parameters.

			max block size
data type	resolution	min. block size	in Msamples
			(2 M*72 memory)1
real	12	6	12
real	24	3	6
complex	12	3	6
complex	24	2	3

1.Parity memory is used in non-parity mode, so 2M× 72 bit memory yields 18 Mbytes of FIFO storage.

Note	Block size must be an even number. Considerably more samples may need to be taken in order to
	set the block available status bit.
blocksizePtr	points to the current value of the blocksize parameter. The returned value is the closest valid value
	to the requested block size.
dataDelay	is used to specify the minimum FIFO delay in number of samples. This parameter applies only in
	continuous mode.
	AGE1439_DATA_DELAY_MAXsets the maximum allowable delay.
	AGE1439_DATA_DELAY_MIN sets the minimum allowable delay.
dataDelayPtr	points to the current value of the delay parameter.
dataType	determines whether the Agilent E1439 collects and returns real or complex data.
	Setting this parameter to AGE1439_REAL causes only the real part of the data to be returned for
	each sample
	AGE1439_COMPLEX causes the real data followed by the imaginary data to be returned in each
	sample.
	Normally, if the center frequency set with the age1439_frequency_setup function is zero, the
	type should be set to AGE1439_REAL since the imaginary component of each sample is zero
	anyway. When non-zero center frequencies are used the type should normally be set to
	AGE1439_COMPLEX, otherwise the imaginary component of the signal is lost.

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