SM3G Datasheet, PDF (14/36 Pages) Connor-Winfield Corporation – ULTRA MINIATURE STRATUM 3 MODULE

Register Descriptions and Operation continued
Ref_Pullin_Sts, 0x09 (R)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0: Default 0: Default
0: Default
0: Default
0: out range
ref4 sts
1: in range
0: out range
ref3 sts
1: in range
0: out range
ref2 sts
1: in range
0: out range
ref1 sts
1: in range
Each bit indicates if the reference is within the frequency range specified by the value in the Max_Pullin register.
Ref_Qualified, 0x0a (R)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0: Default 0: Default
0: Default
0: Default
ref4 qual:
1: avail.
0: not avail.
ref3 qual:
1: avail.
0: not avail.
ref2 qual:
1: avail.
0: not avail.
ref1 qual:
1: avail.
0: not avail.
This register contains the “anded” condition of the Ref_Activity and Ref_Pullin_Sts registers for each of the Ref1-4
inputs, qualified for 10 seconds. When a reference signal has been present for > 10 seconds and is within the pull-in
range, it’s bit is set.
Ref_Mask, 0x0b (R/W)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0: Default 0: Default
0: Default
0: Default
ref4 mask:
1: avail.
0: not avail.
Default: 0
ref3 mask:
1: avail.
0: not avail.
Default: 0
ref2 mask:
1: avail.
0: not avail.
Default: 0
ref1 mask:
1: avail.
0: not avail.
Default: 0
Individual references may be marked as “available” or “not available” for selection in the automatic reference selection
mode
(bit 1 = 0 in the Ctl_Mode register). The reset default value is 0, “not available”. In manual reference selection, either
hardware or register controlled, the reference masks have no effect, but do remain valid and are applied upon a transi-
tion to automatic mode.
Ref_Available, 0x0c (R)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
0: Default 0: Default
0: Default
0: Default
ref4 avail:
1: avail.
0: not avail.
ref3 avail:
1: avail.
0: not avail.
This register contains the “anded” condition of the Ref_Qualified and Ref_Mask registers.
Bit 1
ref2 avail:
1: avail.
0: not avail.
Bit 0
ref1 avail:
1: avail.
0: not
Ref_Rev_Delay, 0x0d (R/W)
Bit 7 ~ Bit 0
Reference reversion delay time, 0 - 255 minutes. default, 0000 0101, 5 minutes
In automatic reference selection mode, when a reference fails and later returns, it must be available for the time speci-
fied in the Ref_Rev_Delay register before it can be switched back to as the active reference (if the new reference was
marked as “revertive”). See Figure 7.
SM3G5 Data Sheet #: TM083 Page 14 of 36 Rev: 05 Date: 01/26/11
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