SM34 Data Sheet #:

TM095

Page 14

Rev:

05 Date: 11/19/12

© Copyright 2012 The Connor-Winfield Corp. All Rights Reserved

Specifications subject to change without notice

Register Descriptions and Operation continued

Op_Mode, 0x05 (R/W)

Bit 7 ~ Bit 5

Bit 4

Bit 3 ~ Bit 0

Reserved

MasterorSlaveMode

FreeRun,Locked,orHoldOver:

1:Master

0000:FreeRunmode

0:Slave

0001:LockedonRef1

(ReadOnly)

0010:LockedonRef2

0011:LockedonRef3

0100:LockedonRef4

0101:LockedonRef5

0110:LockedonRef6

0111:LockedonRef7

1000:LockedonRef8

1001-1111:HoldOver

Bit4ofthisregisterisread-onlyandfollowsthestateofthe

M/Spin.

Whenthedeviceisinslavemode,itwilllocktothe

Xrefinput,independentofthevalueswrittentobits3-0ofthe

Op_moderegister.Theoperationalmodeandreferenceselectionwrittentobits3-0whileinslavemodewill,however,

takeeffectwhenthedeviceismadethemaster.

Whenbit1ofthe

Ctl_Moderegisterisreset(automaticreferenceandmodeselection)andthedeviceisinmaster

mode,bits3-0ofthe

Op_Moderegisterbecomeread-only.

Whenbit1ofthe

Ctl_Moderegisteris1(manualreferenceandmodeselection),youwritetobit3-0toselecttheac-

tivereference,freerunorholdover.

Max_Pullin_Range, 0x06 (R/W)

Bit 7 ~ Bit 0

Maximumpull-inrangein0.1ppmunit

Thisregistershouldbesetaccordingtothevaluesspecifiedbythestandards(GR-1244)appropriatefortheparticular

stratumofoperation.Thepower-updefaultvalueis10ppm.(=4.6ppmaging+4.6ppmpullin+margin).

M/S REF_Activity, 0x07 (R)

Bit 7 ~ Bit 4

Bit 3 ~ Bit 0

Reserved

Crossreferenceactivity

0000:Nosignal

0001:8kHz

0100:12.96MHz

0101:19.44MHz

0110:25.92MHz

0111:38.88MHz

1000:51.84MHz

1001:77.76MHz

1010-1111:Reserved

Indicatessignalpresenceandauto-detectedfrequencyfortheM/SREFinput.

Ref_Activity, 0x08 (R)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

ref8activity ref7activity

ref6activity

ref5activity

ref4activity

ref3activity

ref2activity

ref1activity

1:on

1:on

1:on

1:on

1:on

1:on

1:on

1:on

0:off

0:off

0:off

0:off

0:off

0:off

0:off

0:off

Eachbitindicatesthepresenceofasignalforthatreference.