
Table of Contents
(continued)
Contents
Page
Agere Systems Inc.
3
May 2001
and Packet Payload Engine
Data Sheet
Ambassador T8110 PCI-Based H.100/H.110 Switch
6.1.10 Watchdog EN Register ....................................................................................................................53
6.1.11 Failsafe Control Registers ................................................................................................................54
6.1.12
External Buffers—Descriptor Table Base Address ..........................................................................55
6.2 Error and Status Registers ...........................................................................................................................55
6.2.1
Clock Errors .....................................................................................................................................56
6.2.1.1
Transient Clock Errors Registers .........................................................................................56
6.2.1.2
Latched Clock Error Register ..............................................................................................57
6.2.2
System Status ..................................................................................................................................58
6.2.3
Clock Fallback Status Register ........................................................................................................58
6.2.4
PLL and Switching Status Register ..................................................................................................58
6.2.5
System Errors Register ....................................................................................................................59
6.2.6
Device Identification Registers .........................................................................................................60
6.2.7
Miscellaneous Status .......................................................................................................................61
7 Clock Architecture ...............................................................................................................................................62
7.1 Clock Input Control Registers .......................................................................................................................63
7.1.1
Main Input Selector Register ............................................................................................................63
7.1.2
Main Divider Register .......................................................................................................................64
7.1.3
Analog PLL1 (APLL1) Input Selector Register .................................................................................64
7.1.4
APLL1 Rate Register .......................................................................................................................65
7.1.5
Main Inversion Select Register ........................................................................................................65
7.1.6
Resource Divider Register ...............................................................................................................66
7.1.7
Analog PLL2 (APLL2) Rate Register ...............................................................................................66
7.1.8
LREF Input Select Registers ............................................................................................................67
7.1.9
DPLL1 Input Selector .......................................................................................................................68
7.1.9.1
DPLL1 Rate Register ...........................................................................................................68
7.1.10 DPLL2 Input Selector .......................................................................................................................69
7.1.10.1 DPLL2 Rate Register ...........................................................................................................69
7.1.11 NETREF1 Registers ........................................................................................................................70
7.1.12 NETREF2 Registers ........................................................................................................................71
7.2 Clock Output Control Registers ....................................................................................................................72
7.2.1
Master Output Enables Register ......................................................................................................72
7.2.2
Clock Output Format Registers ........................................................................................................74
7.2.3
TCLK and L_SCx Select Registers ..................................................................................................74
7.3 Clock Register Access ..................................................................................................................................76
7.4 Clock Circuit Operation—APLL1 ..................................................................................................................76
7.4.1
Main Clock Selection, Bit Clock, and Frame ....................................................................................76
7.4.1.1
Watchdog Timers ................................................................................................................77
7.4.1.2
Frame Center Sampling ......................................................................................................78
7.4.2
Main and Resource Dividers ............................................................................................................78
7.4.3
DPLL1 ..............................................................................................................................................79
7.4.4
Reference Selector ..........................................................................................................................79
7.4.5
Internal Clock Generation ................................................................................................................79
7.4.5.1
Phase Alignment .................................................................................................................80
7.5 Clock Circuit Operation, APLL2 ....................................................................................................................81
7.5.1
DPLL2 ..............................................................................................................................................81
7.6 Clock Circuit Operation, CT_NETREF Generation .......................................................................................81
7.6.1
NETREF Source Select ...................................................................................................................81
7.6.2
NETREF Divider ..............................................................................................................................81
7.7 Clock Circuit Operation—Fallback and Failsafe ...........................................................................................82