136©2018 Integrated Device Technology, Inc September 12, 2018
8A3xxxx Family Programming Guide
REF_MON_0.IN_MON_FREQ_VLD_INTV
Frequency validation interval in units of 10 milliseconds.
REF_MON_0.IN_MON_FREQ_CFG Bit Field Descriptions
Bit Field Name Field Type Default Value Description
RESERVED N/A - This field must not be modified from the read value
VLD_INTERVAL[6:3] R/W 0 Frequency validation interval.
Frequency validation interval in seconds.
The long term reference monitor uses VLD_INTERVAL as the period to
measure the frequency offset.
0 means using IN_MON_FREQ_VLD_INTV.VLD_INTERVAL_SHORT as
validation measurement interval.
FREQ_OFFS_LIM[2:0] R/W 0 Frequency offset limit enumeration.
VLD_INTERVAL and FREQ_OFFS_LIM define the long term reference monitor
parameters.
IN_MON_CFG.MASK_FREQ enables/disables the long term reference monitor.
0 = 9.2 ppm(A), 12 ppm(R)
1 = 13.8 ppm(A), 18 ppm(R)
2 = 24.6 ppm(A), 32 ppm(R)
3 = 36.6 ppm(A), 47.5 ppm(R)
4 = 40 ppm(A), 52 ppm(R)
5 = 52 ppm(A), 67.5 ppm(R)
6 = 64 ppm(A), 83 ppm(R)
7 = 100 pm(A), 130 ppm(R)
Table 165: REF_MON_0.IN_MON_FREQ_VLD_INTV Bit Field Locations and Descriptions
Offset
Address
(Hex)
REF_MON_0.IN_MON_FREQ_VLD_INTV Bit Field Locations
D7 D6 D5 D4 D3 D2 D1 D0
001h VLD_INTERVAL_SHORT[7:0]
REF_MON_0.IN_MON_FREQ_VLD_INTV Bit Field Descriptions
Bit Field Name Field Type Default Value Description
VLD_INTERVAL_SHORT[7
:0]
R/W 0 Reference frequency validation short interval in units of 10 milliseconds.
Used as freq measurement period when IN_MON_FREQ_CFG.VLD_INTERVAL
= 0.
0 means 5 seconds.
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