Preliminary Data Sheet #: TM012

Page 6 of 16

Rev: P06

Date: 05/20/ 02

CNTLB CNTLA

Mode

Status1Status0 Alarm

RFL

LOR

PBO

Condition

0

0

Free Run

001000

0

0

Free Run

001100

0

1

Reference #1

010000

Normal Operation

0

1

Reference #1

011000

Unit is in Fast Acquire mode

0

1

Reference #1

010100

Output freq. is 15 ppm or more

from Free Run mode freq.

0

1

Reference #1

010010

Selected reference signal is not

detected and unit is in pseudo-

Hold Over*

0

1

Reference #1

010001

Phase build-out is occuring on

selected reference

0

1

Reference #1

011001

Phase build-out is occuring and

has continuously occurred for at

least 0.4 seconds and the unit is

in pseudo-Hold Over*

1

0

Reference #2

100000

Normal Operation

1

0

Reference #2

101000

Unit is in Fast Acquire mode

1

0

Reference #2

100100

Output freq. is 15 ppm or more

from Free Run mode freq.

1

0

Reference #2

100010

Selected reference signal is not

detected and unit is in pseudo-

Hold Over*

1

0

Reference #2

100001

Phase build-out is occuring on

selected reference

1

0

Reference #2

101001

Phase build-out is occuring and

has continuously occurred for at

least 0.4 seconds and the unit is

in pseudo-Hold Over*

1

1

Hold Over

111000

1

1

Hold Over

111100

Functional Truth Table

Table 8

*Psuedo-Hold Over is a condition when the module is no longer tracking a reference and is holding the last output that was sent to

the Sync_Out pin. Variations in the output frequency are due only to the drift of the OCXO.