Silan

Semiconductors

SC9256

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

REV: 1.0

2002.01.30.

20

LSB

MSB

Address D3H

PE1

PE2

PE3

000

001

010

011

100

11

0

110

111

PHASE ERROR (PE)

PE<

f0.55­s

f0.55­s ‚PE<f1.65­s

f1.65­s ‚PE<f2.75­s

f2.75­s ‚PE<f3.85­s

f3.85­s ‚PE<f4.95­s

f4.95­s ‚PE<f6.05­s

f6.05­s ‚PE<f7.15­s

f7.15­s ‚PE

The phase error data can be read from the output register (D3H) as serial data PE1~PE3.

Following is a typical lock detection operation. It shows the operation flow from locked state to frequency change

with a phase error greater than

±6.05µs.

Frequency change

WAIT

Phase error detection

start Reset bit

1

WAIT

Time interval exceeding that of

reference frequcncy cycle

ENABLE=1?

UNLOCK bit =0?

Check phase error

detection bits

PE1,PE2 and PE3

PE1=1,PE2=0,PE3=1?

Phase error=greater than

f4.95­s

and less than

f6.05­s

YES

YES (Lock)

YES

NO

NO

NO (UNLOCK)

Fig.11