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SuperI/O Module (Continued)

4.3

CONFIGURATION STRUCTURE / ACCESS

This section describes the structure of the configuration

registers.

4.3.1

Index-Data Register Pair

The SIO configuration access is performed via an Index-

Data register pair, using only two system I/O byte locations.

The base address of this register pair is determined

according to the state of the IO_SIOCFG_IN bit field of the

Core Logic module (F5BAR0+I/O Offset 00h[26:25]). Table

4-1 shows the selected base addresses as a function of the

IO_SIOCFG_IN bit field.

The Index Register is an 8-bit R/W register located at the

selected base address (Base+0). It is used as a pointer to

the configuration register file, and holds the index of the

configuration register that is currently accessible via the

Data Register. Reading the Index Register returns the last

value written to it (or the default of 00h after reset).

The Data Register is an 8-bit virtual register, used as a

data path to any configuration register. Accessing the data

4.3.2

Banked Logical Device Registers

Each functional block is associated with a Logical Device

Number (LDN). The configuration registers are grouped

into banks, where each bank holds the standard configura-

tion registers of the corresponding logical device. Table 4-2

shows the LDNs of the device functional blocks.

Figure 4-3 shows the structure of the standard PnP config-

uration register file. The SIO Control And Configuration

registers are not banked and are accessed by the Index-

Data register pair only (as described above). However, the

Logical Device Control and Configuration registers are

duplicated over eight banks for eight logical devices. There-

fore, accessing a specific register in a specific bank is per-

formed by two-dimensional indexing, where the LDN

Data register while the Index register holds a value of 30h

or higher results in a physical access to the Logical Device

Configuration registers currently pointed to by the Index

the LDN register.

Figure 4-3. Structure of the Standard

Configuration Register File

Table 4-1. SIO Configuration Options

IO_SIOCFG_IN

Settings

I/O Address

Description

Index

Data

SIO disabled

Configuration

access disabled

002Eh

002Fh

Base address 1

selected

015Ch

015Dh

Base address 2

selected

Table 4-2. LDN Assignments

LDN

Functional Block

Reference

00h

Real-Time Clock (RTC)

Page 107

01h

System Wakeup Control (SWC)

Page 109

02h

Infrared Communication Port

(IRCP)orSerialPort3(SP3)

Page 110

03h

Serial Port 1 (SP1)

Page 111

05h

ACCESS.bus 1 (ACB1)

Page 112

06h

ACCESS.bus 2 (ACB2)

07h

Parallel Port (PP)

Page 113

08h

Serial Port 2 (SP2)

Page 111

07h

20h

30h

60h

75h

FEh

Logical Device Number Register

SIO Configuration Registers

Logical Device Control Register

Standard Logical Device

Banks

(One per Logical Device)

2Fh

F0h

Bank

63h

74h

70h

71h

Standard Registers

Special (Vendor-defined)

Configuration Registers

Logical Device

Select

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