Advance Information

MT9042C

9

Figure 7 - Manual Control State Diagram

Description

State

Input Controls

Freerun

Normal

(PRI)

Normal

(SEC)

Holdover

(PRI)

Holdover

(SEC)

MS2

MS1

RSEL

GTi

S0

S1

S2

S1H

S2H

0

0

0

0

S1

-

S1 MTIE

S1

S1 MTIE

0

0

0

1

S1

-

S1 MTIE

S1 MTIE

S1 MTIE

0

0

1

X

S2

S2 MTIE

-

S2 MTIE

S2 MTIE

0

1

0

X

/

S1H

/

-

/

0

1

1

X

/

S2H

S2H

/

-

10

X

X

-

S0

S0

S0

S0

Legend:

-

No Change

/

Not Valid

MTIE

State change occurs with TIE Corrector Circuit

Refer to Manual Control State Diagram for state changes to and from Auto-Holdover State

Table 4 - Manual Control State Table

Phase Re-Alignment

Phase Continuity Maintained (without TIE Corrector Circuit)

Phase Continuity Maintained (with TIE Corrector Circuit)

NOTES:

(XXX)

MS2 MS1 RSEL

{A}

Invalid Reference Signal

Movement to Normal State from any

state requires a valid input signal

{A}

{A}

S0

Freerun

(10X)

S2H

Holdover

Secondary

(011)

S1H

Holdover

Primary

(010)

S2

Normal

Secondary

(001)

S1

Normal

Primary

(000)

(GTi=0)

(GTi=1)

S1A

Auto-Holdover

Primary

(000)

S2A

Auto-Holdover

Secondary

(001)