PC87417 Datasheet, PDF (11/257 Pages) National Semiconductor (TI) – LPC ServerI/O for Servers and Workstations

Table of Contents (Continued)
6.2.7
6.2.8
6.2.9
6.2.10
Arbitration on the Bus ................................................................................................ 120
Packet Error Check (PEC) ......................................................................................... 120
ACCESS.bus Protocol ............................................................................................... 121
Transaction Execution ............................................................................................... 125
6.3 ACB REGISTERS (ON ACCESS.BUS ONLY) ........................................................................ 126
6.3.1 ACB Register Map (on ACCESS.bus Only) .............................................................. 126
6.3.2 ACCESS.bus Control/Status Register (ACBCST) ..................................................... 127
6.3.3 ACCESS.bus Configuration Register (ACBCFG) ...................................................... 128
6.3.4 ACCESS.bus Lock Control Register (ACBLKCTL) ................................................... 128
6.3.5 ACCESS.bus Fast Disable Register (ACBFDIS) ....................................................... 130
6.3.6 ACCESS.bus TRI-STATE Register (ACBTRIS) ........................................................ 131
6.3.7 Access Lock Configuration 1 Register (ACCLCF1) ................................................... 132
6.3.8 Access Lock Configuration 2 Register (ACCLCF2) ................................................... 133
6.4 ACB REGISTER BITMAP ........................................................................................................ 134
7.0 General-Purpose Input/Output (GPIO) Ports
7.1 OVERVIEW ............................................................................................................................. 135
7.2 BASIC FUNCTIONALITY ........................................................................................................ 136
7.2.1 Configuration Options ................................................................................................ 136
7.2.2 Operation ................................................................................................................... 137
7.3 EVENT HANDLING AND SYSTEM NOTIFICATION .............................................................. 137
7.3.1 Event Configuration ................................................................................................... 137
7.3.2 System Notification .................................................................................................... 138
7.4 GPIO PORT REGISTERS ....................................................................................................... 139
7.4.1 GPIO Pin Configuration Registers Structure ............................................................. 139
7.4.2 GPIO Port Runtime Register Map ............................................................................. 140
7.4.3 GPIO Data Out Register (GPDO) .............................................................................. 140
7.4.4 GPIO Data In Register (GPDI) .................................................................................. 140
7.4.5 GPIO Event Enable Register (GPEVEN) .................................................................. 141
7.4.6 GPIO Event Status Register (GPEVST) .................................................................... 141
8.0 Real-Time Clock (RTC)
8.1 OVERVIEW ............................................................................................................................. 142
8.2 FUNCTIONAL DESCRIPTION ................................................................................................ 142
8.2.1 Bus Interface ............................................................................................................. 142
8.2.2 RTC Clock Generation .............................................................................................. 142
8.2.3 Internal Oscillator ....................................................................................................... 142
8.2.4 External Oscillator ..................................................................................................... 143
8.2.5 Timing Generation ..................................................................................................... 144
8.2.6 Timekeeping .............................................................................................................. 144
8.2.7 Updating .................................................................................................................... 145
8.2.8 Alarms ....................................................................................................................... 145
8.2.9 Power Supply ............................................................................................................ 146
8.2.10 System Bus Lockout .................................................................................................. 147
Revision 1.2
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