Sundance SMT712 - Manual (Page 49)

User Manual SMT712 Page 49 of 89 Last Edited: 11/12/2012 10:36:00
1 1 automatic reference switchover.
Setting Bit 3 Description (Stay on REF2)
0 0 return to REF1 automatically when REF1 status is good again.
1 1 stay on REF2 after switchover. Do not automatically return to REF1.
Setting Bit 2 Description (REF2 Power on)
0 0 REF2 power off.
1 1 REF2 power on.
Setting Bit 1 Description (REF1 Power on)
0 0 REF1 power off.
1 1 REF1 power on.
Setting Bit 0 Description (Differential Reference)
0 0 single-ended reference mode.
1 1 differential reference mode.
4.6.1.1.21 Clock Generator (AD9516-2) Register 0x1D – PLL Control
8 – 0xFC (write).
Clock Generator (AD9516-2) Register 0x1D – PLL Control 8 – 0xFC (write)
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0
Reserved
PLL Status
Register
Disable
LD Pin
Comparator
Enable
Holdover
Enable
External
Holdover
Control
Holdover
Enable
Default ‘000’ ‘0’ ‘0’ ‘0’ ‘0’ ‘0’
Clock Generator (AD9516-2) Register 0x1D – PLL Control 8 – 0xFC (write)
Setting Bit 4 Description (PLL Status Register Disable)
0 0 PLL status register enable.
1 1 PLL status register disable.
Setting Bit 3 Description (LD pin Comparator Enable)
0 0 disable LD pin comparator; internal/automatic holdover controller treats this pin as true
(high).
1 1 enable LD pin comparator.
Setting Bit 2 Description (Holdover Enable)
0 0 holdover disabled.
1 1 holdover enabled.
Setting Bit 1 Description (External Holdover Enable)
0 0 automatic holdover mode—holdover controlled by automatic holdover circuit.
1 1 external holdover mode—holdover controlled by SYNC pin.
Setting Bit 0 Description (Holdover Enable)
0 0 holdover disabled.
1 1 holdover enabled.