STC5455 datasheet(39/56 Pages) CONNOR-WINFIELD

39 / 56 page

Page 39 of 56 TM121

Rev:P1.3

Date: October 24, 2011

STC5455

Synchronous Clock for SETS

Data sheet

Preliminary

PLL_Status, 0x3C (R)

SYNC Indicates whether synchronization has been achieved

0 = Not synchronized

1 = Synchronized

LOS

Loss of signal of the selected reference

0 = No Loss

1 = Loss (Indicate loss of signal, freerun, pseudo holdover and holdover)

LOL

Loss of lock (Failure to achieve or maintain lock)

0 = No loss of lock

1 = Loss of lock (Indicate loss of lock, freerun, pseudo holdover and holdover)

OOP

Out of pull-in range. Indicate the frequency offset of the selected reference input is out of pull-in range.

1 = Out of pull-in range

0 = In range

SAP

Indicates whether the output clocks have stopped following the selected reference, caused by out of

pull-in range

1 = Stop following at pull-in range boundary

0 = Following

FEE

Frame edge error. Indicates whether an error occurs when select frame edge in frame phase align

mode. Frame edge on the reference input is selected at the register Frame_Phase_Align

1 = Frame edge error occurs

0 = No frame edge error occurs

DHT

Device Holdover History tracking

1 = Device holdover history is being tracked.

0 = Device holdover history is acquired based on the last available history

HHA

Holdover History Availability. Configure Control_Mode register to select which of holdover history is

used. Device Holdover History or User Specified History.

1 = Available

0 = Not available

Holdover_Accu_Flush, 0x3D (W)

Writing to this register will perform a flush to the accumulated history. Bit HO flush determines which of histo-

ries is flushed.

HO flush:

0 = Flush and clear long term history to 0

Address

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0x3C

HHA

DHT

FEE

SAP

OOP

LOL

LOS

SYNC

Address

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0x3D

Not used

HO flush

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