AMD SC3200 manual Standard Configuration Registers, SIO Control and Configuration Registers

32581C SuperI/O Module

5.4Standard Configuration Registers

As illustrated in Figure 5-4,the Standard Configuration reg- isters are broadly divided into two categories: SIO Control and Configuration registers and Logical Device Control and Configuration registers (one per logical device, some are optional).

SIO Control and Configuration Registers

The only PnP control register in the SIO module is the Log- ical Device Number register at Index 07h. All other stan- dard PnP control registers are associated with PnP protocol for ISA add-in cards, and are not supported by the SIO module.

The SIO Configuration registers at Index 20h-27h are mainly used for part identification. (See Section 5.4.1 "SIO Control and Configuration Registers" on page 95 for further details.)

Logical Device Control and Configuration Registers

A subset of these registers is implemented for each logical device. (See Table 5-2 on page 90 for LDN assignment and Section 5.4.2 "Logical Device Control and Configuration" on page 96 for register details.)

Logical Device Control Register (Index 30h): The only implemented Logical Device Control register is the Activate register at Index 30. Bit 0 of the Activate register and bit 0 of the SIO Configuration 1 register (Global Device Enable bit) control the activation of the associated function block

(except for the RTC and the SWC). Activation of the block enables access to the block’s registers, and attaches its system resources, which are unused as long as the block is not activated. Activation of the block may also result in other effects (e.g., clock enable and active signaling), for certain functions.

Standard Logical Device Configuration Registers

(Index 60h-75h):These registers are used to manage the resource allocation to the functional blocks. The I/O port base address descriptor 0 is a pair of registers at Index 60h-61h, holding the (first or only) 16-bit base address for the register set of the functional block. An optional second base-address (descriptor 1) at Index 62h-63h is used for devices with more than one continuous register set. Inter- rupt Number Select (Index 70h) and Interrupt Type Select (Index 71h) allocate an IRQ line to the block and control its type. DMA Channel Select 0 (Index 74h) allocates a DMA channel to the block, where applicable. DMA Channel Select 1 (Index 75h) allocates a second DMA channel, where applicable.

Special Logical Device Configuration Registers (F0h-

F3h): The vendor-defined registers, starting at Index F0h are used to control function-specific parameters such as operation modes, power saving modes, pin TRI-STATE, clock rate selection, and non-standard extensions to generic functions.

			Index	Register Name
			07h	Logical Device Number
			20h	SIO ID
			21h	SIO Configuration 1
		SIO Control and
	Configuration Registers		22h	SIO Configuration 2
			27h	SIO Revision ID
			2Eh	Reserved exclusively for AMD use
			30h	Logical Device Control (Activate)
			60h	I/O Port Base Address Descriptor 0 Bits [15:8]
			61h	I/O Port Base Address Descriptor 0 Bits [7:0]
			62h	I/O Port Base Address Descriptor 1 Bits [15:8]
			63h	I/O Port Base Address Descriptor 1 Bits [7:0]
Logical Device Control and			70h	Interrupt Number Select
	Configuration Registers -		71h	Interrupt Type Select
		one per logical device
			74h	DMA Channel Select 0
		(some are optional)
			75h	DMA Channel Select 1
			F0h	Device Specific Logical Device Configuration 1
			F1h	Device Specific Logical Device Configuration 2
			F2h	Device Specific Logical Device Configuration 3
			F3h	Device Specific Logical Device Configuration 4

	Figure 5-4. Standard Configuration Registers Map
92	AMD Geode™ SC3200 Processor Data Book