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104

Revision 3.0

SuperI/O Module (Continued)

Table 4-3 provides the bit definitions for the Standard Con-

figuration registers.

• All reserved bits return 0 on reads, except where noted

otherwise. They must not be modified as such modifica-

tion may cause unpredictable results. Use read-modify-

write to prevent the values of reserved bits from being

changed during write.

• Write only registers should not use read-modify-write

during updates.

Table 4-3. Standard Configuration Registers

Bit

Description

Index 07h

Logical Device Number (R/W)

This register selects the current logical device. See Table 4-2 for valid numbers. All other values are reserved.

7:0

Logical Device number.

Index 20h-2Fh

SIO Configuration (R/W)

SIO configuration and ID registers. See Section 4.4.1 "SIO Control and Configuration Registers" on page 106 for register/bit details.

Index 30h

Activate (R/W)

7:1

Reserved.

Logical Device Activation Control.

Disable

Enable

Index 60h

I/O Port Base Address Bits [15:8] Descriptor 0 (R/W)

7:0

Descriptor 0 A[15:8]. Selects I/O lower limit address bits [15:8] for I/O Descriptor 0.

Index 61h

I/O Port Base Address Bits [7:0] Descriptor 0 (R/W)

7:0

Descriptor 0 A[7:0]. Selects I/O lower limit address bits [7:0] for I/O Descriptor 0.

Index 62h

I/O Port Base Address Bits [15:8] Descriptor 1 (R/W)

7:0

Descriptor 1 A[15:8]. Selects I/O lower limit address bits [15:8] for I/O Descriptor 1.

Index 63h

I/O Port Base Address Bits [7:0] Descriptor 1 (R/W)

7:0

Descriptor 1 A[7:0]. Selects I/O lower limit address bits [7:0] for I/O Descriptor 1.

Index 70h

Interrupt Number (R/W)

7:4

Reserved.

3:0

Interrupt Number. These bits select the interrupt number. A value of 1 selects IRQ1, a value of 2 selects IRQ2, etc. (up to

IRQ12).

Note: IRQ0 is not a valid interrupt selection.

Index 71h

Interrupt Request Type Select (R/W)

Selects the type and level of the interrupt request number selected in the previous register.

7:2

Reserved.

Interrupt Level Requested. Level of interrupt request selected in previous register.

Low polarity.

High polarity.

This bit must be set to 1 (high polarity), except for IRQ8#, that must be low polarity.

Interrupt Type Requested. Type of interrupt request selected in previous register.

Edge.

Level.

Index 74h

DMA Channel Select 0 (R/W)

Selects selected DMA channel for DMA 0 of the logical device (0 - the first DMA channel in case of using more than one DMA channel).

7:3

Reserved.

2:0

DMA 0 Channel Select. This bit field selects the DMA channel for DMA 0.

The valid choices are 0-3, where a value of 0 selects DMA channel 0, 1 selects channel 1, etc.

A value of 4 indicates that no DMA channel is active.

Values 5-7 are reserved.

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