stc3800 Connor-Winfield VCXOs, stc3800 Datasheet - Page 20

• Manufacturer Part Number: stc3800
• Description: Integrated - Stratum 3e Timing Source
• Manufacturer: Connor-Winfield VCXOs

Register Descriptions and Operation continued
Ref_Pullin_Sts, 0x09 (R)
Each bit indicates if the reference is within the frequency range specified by the value in the Max_Pullin_Range register.
Ref_Qualified, 0x0a (R)
This register contains the “anded” condition of the Ref_Activity and Ref_Pullin_Sts registers for each of the Ref1-8 inputs, quali-
fied 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.
Individual references may be marked as “use” or “no use” for selection in the automatic reference selection mode (bit 1 = 0 in the
Ctl_Mode register). The reset default value is 0, “no use”. In manual reference selection, either hardware or register controlled, the
reference masks have no effect, but do remain valid and are applied upon a transition to automatic mode.
Ref_Available, 0x0c (R)
This register contains the “anded” condition of the Ref_Qualified and Ref_Mask registers.
Ref_Rev_Delay, 0x0d (R/W)
In automatic reference selection mode, when a higher priority reference fails and later returns, it must be avail-able for the time
specified in the Ref_Rev_Delay register before it can be switched back to as the active refer-ence (if the new selected reference
was marked as “revertive”). See Figure 6.
Ref_Mask, 0x0b (R/W)
ref8 sts
1: in range
0: out range
ref8 qual:
1: qual.
0: not qual.
ref8 mask:
1: use
0: no use
Default: 0
ref8 avail:
1: avail.
0: not avail.
Reference reversion delay time, 0 - 255 minutes. default = 5 (minutes)
Bit 7
Bit 7
Bit 7
Bit 7
ref7 sts
1: in range
0: out range
ref7 qual:
1: qual.
0: not qual.
ref7 mask:
1: use
0: no use
Default: 0
ref7 avail:
1: avail.
0: not avail.
Bit 6
Bit 6
Bit 6
Bit 6
ref6 sts
1: in range
0: out range
ref6 qual:
1: qual.
0: not qual.
ref6 mask:
1: use
0: no use
Default: 0
ref6 avail:
1: avail.
0: not avail.
Bit 5
Bit 5
Bit 5
Bit 5
© Copyright 2001 The Connor-Winfield Corp. All Rights Reserved
Preliminary Data Sheet #: TM061
ref5 sts
1: in range
0: out range
ref5 qual:
1: qual.
0: not qual.
ref5 mask:
1: use
0: no use
Default: 0
ref5 avail:
1: avail.
0: not avail.
Bit 4
Bit 4
Bit 4
Bit 4
Bit 7 ~ Bit 0
ref4 sts
1: in range
0: out range
ref4 qual:
1: qual.
0: not qual.
ref4 mask:
1: use
0: no use
Default: 0
ref4 avail:
1: avail.
0: not avail.
Bit 3
Bit 3
Bit 3
Bit 3
Page 20 of 48
ref3 sts
1: in range
0: out range
ref3 qual:
1: qual.
0: not qual.
ref3 mask:
1: use
0: no use
Default: 0
ref3 avail:
1: avail.
0: not avail.
Bit 2
Bit 2
Bit 2
Bit 2
Specifications subject to change without notice
Rev: P06
ref2 sts
1: in range
0: out range
ref2 qual:
1: qual.
0: not qual.
ref2 mask:
1: use
0: no use
Default: 0
ref2 avail:
1: avail.
0: not avail.
Bit 1
Bit 1
Bit 1
Bit 1
Date: 11/22/04
ref1 sts
1: in range
0: out range
ref1 qual:
1: qual.
0: not qual.
ref1 mask:
1: use
0: no use
Default: 0
ref1 avail:
1: avail.
0: not
Bit 0
Bit 0
Bit 0
Bit 0