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©2018 Integrated Device Technology, Inc
September 12, 2018
8A3xxxx Family Programming Guide
REF_MON_0.IN_MON_LOS_TOLERANCE
Loss of signal tolerance configuration.
REF_MON_0.IN_MON_ACT_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
QUAL_TIMER[6:5]
R/W
0
Reference activity qualification timer enumeration.
Qualification timer value = qual_timer * dsqual_timer.
0 = 4x
1 = 2x
2 = 8x
3 = 16x
DSQUAL_TIMER[4:3]
R/W
0
Reference activity disqualification timer enumeration.
0 = 2.5 s
1 = 1.25 ms
2 = 25 ms
3 = 50 ms
ACT_LIM[2:0]
R/W
0
Activity limit +/- 1000 ppm to +/- 12 ppm.
0 = 1000 ppm
1 = 260 ppm
2 = 130 ppm
3 = 83 ppm
4 = 65 ppm
5 = 52 ppm
6 = 18 ppm
7 = 12 ppm
Table 169: REF_MON_0.IN_MON_LOS_TOLERANCE Bit Field Locations and Descriptions
Offset
Address
(Hex)
REF_MON_0.IN_MON_LOS_TOLERANCE Bit Field Locations
D7
D6
D5
D4
D3
D2
D1
D0
008h
IN_MON_LOS_TOLERANCE[7:0]
009h
IN_MON_LOS_TOLERANCE[15:8]
REF_MON_0.IN_MON_LOS_TOLERANCE Bit Field Descriptions
Bit Field Name
Field Type Default Value
Description
IN_MON_LOS_TOLERAN
CE[15:0]
R/W
0
LOS tolerance.
Unsigned 16-bit value in milliseconds.
0 means a reference switch is triggered immediately upon reference LOS
detection.
Non zero value means that if the reference LOS duration is less than
IN_MON_LOS_TOLERANCE, the DPLL will not trigger a reference switch.