Artesyn ATCA 7370 / ATCA 7370-S Installation and Use (January 2015) - Manual (Page 126)

Maps and Registers
ATCA-7370/ATCA-7370-S Installation and Use (6806800P54H) 126
6.2.3.1 Entering the Configuration State
The device enters the configuration state by the following contiguous sequence:
1. Write 80H to Configuration Index Port.
2. Write 86H to Configuration Index Port.
6.2.3.2 Exiting the Configuration State
The device exits the configuration state by the following contiguous sequence:
1. Write 68 to Configuration Index Port.
2. Write 08 to Configuration Index Port
6.2.3.3 Configuration Mode
The system sets the logical device information and activates desired logical devices through
the INDEX and DATA ports.
The desired configuration registers are accessed in two steps.
1. Write the index of the Logical Device Number Configuration Register (i.e., 07) to the
INDEX port and then write the number of the desired logical device to the DATA port.
2. Write the address of the desired configuration register within the logical device to the
INDEX port and then write or read the configuration register through the DATA port.
6.2.3.4 Super I/O Configuration Registers
Address locations that are not listed are considered reserved register locations. Reads to
reserved registers may return non-zero values. Writes to reserved locations may cause system
failure.
 If accessing the Global Configuration Registers, step (1) is not required. The Super IO
returns to the run state.
 Only two states are defined (run and configuration). In the run state the Super IO is
always ready to enter the configuration state.