283©2018 Integrated Device Technology, Inc September 12, 2018
8A3xxxx Family Programming Guide
OUTPUT_TDC_0.OUTPUT_TDC_CTRL_4 Bit Field Descriptions
Bit Field Name Field Type Default Value Description
DISABLE_MEASUREMEN
T_FILTER[7]
R/W 0 Large measurements are considered outliers and filtered out.
If 'source_index' is a DPLL index, measurements larger than 1/2 the master
divider frequency are filtered out. To disable this filtering, set
'disable_measurement_filter' = 1. If 'source_index' is a GPIO, the filtering is
always disabled.
0 = filter enabled
1 = filter disabled
ALIGN_THRESHOLD_CO
UNT[6:4]
R/W 0 Threshold count to determine when alignment is done.
In single shot alignment mode, this determines the number of sequential
measurement readings that match 'target_phase_offset' before declaring
alignment is done.
Value of 0 means count of 1.
ALIGN_RESET[3] R/W 0 Reset output TDC accumulated adjustments to zero prior to starting output TDC
operation. (i.e. clear accumulated coarse phase delay and fine phase advance
adjustments)
Measurement mode: Set to '1' to reset the output TDC alignment of the target
specified by the 'target_index' field.
Alignment mode: Set to '1' to reset the output TDC alignment of the target(s)
specified by the 'alignment_target_mask' field.
Takes effect when 'go' field is set to '1' at the start the output TDC operation.
0 = keep accumulated
1 = clear accumulated
TYPE[2] R/W 0 Type of output TDC operation, single shot or continuous.
Single shot: Collect the number of samples (average if necessary) and clear
'go' when completed.
Continuous: Same as single shot mode, except the operation will be repeated
continuously. To stop operation, clear 'go'.
0 = single shot
1 = continuous
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