/* seqgen.s */
/**********************************************************************
seqgen()
***********************************************************************
This function generates a sequence of bits, which can be used
to exercise a data transmission system.
Any degree polynomial can be implemented
as specified in a parameter array.
Input parameters:
shift_length: Length of shift register
poly[]: Generation polynomial in array
shift_reg: Initial shift reg for pseudo random sequence
num_of_samples: Number of samples
num_per_chip: Number of samples per chip
CONTROL PARAMETERS:
num_of_samples = total number of samples to output.
pace_rate = multiplies the number of samples received
on pace input (if connected) to determine
how many samples to output.
samples_first_time = the number of samples to put out on the
first call if pace input connected. It can
be zero. negative values = 0.
CONTROL DESCRIPTION:
If the pace input is not connected:
The num_of_samples parameter sets the maximum number of samples
that the star will output. If num_of_samples < 0, an indefinite
number of samples can be output.
The star will output a maximum of NUMBER_SAMPLES_PER_VISIT on each call.
If the pace input is connected:
The num_of_samples parameter sets the maximum number of samples
that the star will output. If num_samples_out < 0, an infinite
number of samples can be output.
The pace input paces the number of output samples on each call.
At each call of the star all samples are read from the pace input
and a running total of how many there have been is kept.
An output_target is computed at each pass = pace_input_total *
pace_rate. If pace_rate < 0, the absolute value is used.
On the first call:
output = lesser of (samples_first_time, num_of_samples)
On subsequent calls:
output = lesser of (NUMBER_SAMPLES_PER_VISIT, output_target)
output_target = samples_first_time +
pace_rate * pace_input_total - to that point
The total number of samples that will be output:
samples_out_total = lesser of (num_of_samples,
samples_first_time + pace_rate * pace_input_total)
seqgen
This function generates a sequence of bits, which can be used
to exercise a data transmission system.
Any degree polynomial can be implemented
as specified in a parameter array.
Input parameters:
shift_length: Length of shift register
poly[]: Generation polynomial in array
shift_reg: Initial shift reg for pseudo random sequence
num_of_samples: Number of samples
num_per_chip: Number of samples per chip
CONTROL PARAMETERS:
num_of_samples = total number of samples to output.
pace_rate = multiplies the number of samples received
on pace input (if connected) to determine
how many samples to output.
samples_first_time = the number of samples to put out on the
first call if pace input connected. It can
be zero. negative values = 0.
CONTROL DESCRIPTION:
If the pace input is not connected:
The num_of_samples parameter sets the maximum number of samples
that the star will output. If num_of_samples < 0, an indefinite
number of samples can be output.
The star will output a maximum of NUMBER_SAMPLES_PER_VISIT on each call.
If the pace input is connected:
The num_of_samples parameter sets the maximum number of samples
that the star will output. If num_samples_out < 0, an infinite
number of samples can be output.
The pace input paces the number of output samples on each call.
At each call of the star all samples are read from the pace input
and a running total of how many there have been is kept.
An output_target is computed at each pass = pace_input_total *
pace_rate. If pace_rate < 0, the absolute value is used.
On the first call:
output = lesser of (samples_first_time, num_of_samples)
On subsequent calls:
output = lesser of (NUMBER_SAMPLES_PER_VISIT, output_target)
output_target = samples_first_time +
pace_rate * pace_input_total - to that point
The total number of samples that will be output:
samples_out_total = lesser of (num_of_samples,
samples_first_time + pace_rate * pace_input_total)
*/