SM3 datasheet(27/36 Pages) CONNOR-WINFIELD

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Data Sheet #: TM052

Page 27 of 36

Rev: 03

Date: 11/07/08

Hold Over History access and Control Registers

Table 5

Description

0x25

History_Policy

Sets policy for Hold Over history accumulation: “Rebuild” or “Continue”

0x26

History_Cmd

Save, restore, and flush commands for Hold Over history

0x27

Holdover_Time

Indicates the time since entering the Hold Over state

0x11

DPLL_Status

Bits 3 and 4: Hold Over Available” and “Hold Over Build Complete”

Build History

Hold Control = 0

Hold Available = 0

Acquire Reference

Hold Control = 0

Hold Available = 0

Locked, History

Complete

Hold Control =1

Hold Available = 1

Acquire Reference

Hold Control = 0

Hold Available = 1

Build History

Hold Control = 0

Hold Available = 1

Reference Switch

Reference Lock

(with "Continue" set)

Reference Lock

(with "Rebuild" set)

Reference Lock

Flush

History Build Complete

History Build

Complete,

Replace Active

Hold Over History

History Restored from backup,

re-start the building procedure.

Hold Over History and Status States

Figure 9

Application Notes continued

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