SuperI/O Module

32581C

5.4.1SIO Control and Configuration Registers

Table 5-4lists the SIO Control and Configuration registers and Table 5-5provides their bit formats.

Table 5-4. SIO Control and Configuration Register Map

Index

Type

Name

Power Rail

Reset Value

 

 

 

 

 

20h

RO

SID. SIO ID

VCORE

F5h

21h

R/W

SIOCF1. SIO Configuration 1

VCORE

01h

22h

R/W

SIOCF2. SIO Configuration 2

VPP

02h

27h

RO

SRID. SIO Revision ID

VCORE

01h

2Eh

---

RSVD. Reserved exclusively for AMD use.

---

---

 

 

 

 

 

Table 5-5. SIO Control and Configuration Registers

Bit

Description

 

 

 

 

Index 20h

SIO ID Register - SID (RO)

Reset Value: F5h

 

 

 

7:0

Chip ID. Contains the identity number of the module. The SIO module is identified by the value F5h.

 

 

 

 

Index 21h

SIO Configuration 1 Register - SIOCF1 (RW)

Reset Value: 01h

 

 

7:6

General Purpose Scratch. When bit 5 is set to 1, these bits are RO. After reset, these bits can be read or write. Once

 

changed to RO, the bits can be changed back to R/W only by a hardware reset.

 

 

 

5

Lock Scratch. This bit controls bits 7 and 6 of this register. Once this bit is set to 1 by software, it can be cleared to 0 only

 

by a hardware reset.

 

 

0: Bits 7 and 6 of this register are R/W bits. (Default)

 

 

1: Bits 7 and 6 of this register are RO bits.

 

 

 

 

4:2

Reserved.

 

 

 

 

1

SW Reset. Read always returns 0.

 

 

0: Ignored. (Default)

 

 

1: Resets all devices that are reset by MR (with the exception of the lock bits) and the registers of the SWC.

 

 

0

Global Device Enable. This bit controls the function enable of all the logical devices in the SIO module, except the SWC

 

and the RTC. It allows them to be disabled simultaneously by writing to a single bit.

 

 

0: All logical devices in the SIO module are disabled, except the SWC and the RTC.

 

 

1: Each logical device is enabled according to its Activate register at Index 30h. (Default)

 

 

 

 

Index 22h

SIO Configuration 2 Register - SIOCF2 (R/W)

Reset Value: 02h

Note: This register is reset only when VPP is first applied.

 

7

Reserved.

 

 

 

 

6:4

General Purpose Scratch. Battery-backed.

 

 

 

 

3:2

Reserved.

 

 

 

 

1

Reserved.

 

 

 

 

0

Reserved. (RO)

 

 

 

 

Index 27h

SIO Revision ID Register - SRID (RO)

Reset Value: 01h

 

 

7:0

SIO Revision ID. (RO) This RO register contains the identity number of the chip revision. SRID is incremented on each revi-

 

sion.

 

 

 

 

AMD Geode™ SC3200 Processor Data Book

95

Page 95
Image 95
AMD SC3200 manual SIO Control and Configuration Registers, SIO Control and Configuration Register Map, Sid. Sio Id