Artesyn ATCA-7365 Installation and Use (May 2014) - Manual (Page 170)

Maps and Registers
ATCA-7365 Installation and Use (6806800K65M) 170
6.3.3.3.1 Global Control Configuration Registers
The Super IO Global Registers lie in the address range 0x00-0x2F. All eight bits of the ADDRESS
Port are used for register selection. All unimplemented registers and bits ignore writes and
return zero when read. The INDEX PORT is used to select a configuration register in the chip.
The DATA PORT is then used to access the selected register. These registers are accessible only
in the Configuration Mode.
Table 6-11 Global Configuration Register Summary
Index Address Description
0x07 Super IO Logical Device Number
0x20 Super IO Device ID
0x21 Super IO Device Revision
0x28 Super IO LPC Control
0x29 Super IO SERIRQ and Pre-divide Control
Table 6-12 Super IO Logical Device Number Register
Index Address: 0x07
Bit Description Default Access
7:0 Logical Device Number:
0x04: Logical Device 4 (UART 1Serial Port 1)
0x05: Logical Device 5 (UART2 Serial Port 2)
A write to this register selects the current logical
device. This allows access to the control and
configuration registers for each logical device. 0 LPC: r/w
Table 6-13 Super IO Device Identification Register
Index Address: 0x20
Bit Description Default Access
7:0 Device ID 0 LPC: r