Table of Contents
(continued)
Contents
Page
4
Agere Systems Inc.
Data Sheet
May 2001
and Packet Payload Engine
Ambassador T8110 PCI-Based H.100/H.110 Switch
7.7.1
Clock Fallback .................................................................................................................................82
7.7.1.1
Fallback Events ...................................................................................................................82
7.7.1.2
Fallback Scenarios—Fixed vs. Rotating Secondary ............................................................83
7.7.1.3
H-Bus Clock Enable/Disable on Fallback ............................................................................86
Clock Failsafe ..................................................................................................................................88
7.7.2.1
Failsafe Events ....................................................................................................................88
8 Frame Group and FG I/O ....................................................................................................................................90
8.1 Frame Group Control Registers ....................................................................................................................90
8.1.1
FGx Lower and Upper Start Registers .............................................................................................90
8.1.2
FGx Width Registers ........................................................................................................................91
8.1.3
FGx Rate Registers .........................................................................................................................91
8.2 FG7 Timer Option .........................................................................................................................................92
8.2.1
FG7 Counter (Low and High Byte) Registers ..................................................................................92
8.3 FGIO Control Registers ................................................................................................................................93
8.3.1
FGIO Data Register .........................................................................................................................93
8.3.2
FGIO Read Mask Register ..............................................................................................................93
8.3.3
FGIO R/W Register ..........................................................................................................................94
8.4 FG Circuit Operation .....................................................................................................................................95
8.4.1
Frame Group 8 kHz Reference Generation .....................................................................................96
8.4.2
FGIO General-Purpose Bits .............................................................................................................97
8.4.3
Programmable Timer (FG7 Only) ....................................................................................................97
8.4.4
FG External Interrupts .....................................................................................................................97
8.4.5
FG Diagnostic Test Point Observation ............................................................................................97
9 General-Purpose I/O ...........................................................................................................................................98
9.1 GPIO Control Registers ................................................................................................................................98
9.1.1
GPIO Data Register .........................................................................................................................98
9.1.2
GPIO Read Mask Register ..............................................................................................................99
9.1.3
GPIO R/W Register .........................................................................................................................99
9.1.4
GPIO Override Register .................................................................................................................100
9.2 GP Circuit Operation ...................................................................................................................................100
9.2.1
GPIO General-Purpose Bits ..........................................................................................................101
9.2.2
GP Dual-Purpose Bits GPIO (Override) .........................................................................................101
9.2.2.1
GP H.110 Clock Master Indicators (GP0, GP1 Only) ........................................................101
9.2.2.2
PCI_RST# Indicator (GP2 Only) ........................................................................................101
9.2.3
GP External Interrupts ...................................................................................................................101
9.2.4
GP Diagnostic Test Point Observation ..........................................................................................101
10 Stream Rate Control .......................................................................................................................................102
10.1 H-Bus Stream Rate Control Registers ...................................................................................................103
10.1.1 H-Bus Rate Registers ....................................................................................................................103
10.2 L-Bus Stream Rate Control Registers ...................................................................................................103
10.2.1 L-Bus Rate Registers .....................................................................................................................103
10.2.2 L-Bus 16.384 Mbits/s Operation ....................................................................................................104
10.2.3 16.384 Mbits/s Local I/O Superrate ...............................................................................................105
11 Minibridge ........................................................................................................................................................107
11.1 Wait-State Control Registers .................................................................................................................107
11.1.1 Minibridge Wait-State Control Registers ........................................................................................107
11.2 Strobe Control Registers .......................................................................................................................110
11.3 Minibridge Circuit Operation ..................................................................................................................110
11.4 Minibridge Operational Addressing .......................................................................................................112
7.7.2