Amd Geode SC2200 User Manual Page 173
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AMD Geode™ SC2200 Processor Data Book 181
Core Logic Module
32580B
6.2.12.4 IRQ Configuration Registers
The Core Logic module provides the ability to set and clear
IRQs internally through software control. If the IRQs are
configured for software control, they do not respond to
external hardware. There are two registers provided for this
feature:
• Internal IRQ Enable Register (F3BAR0+Memory Offset
1Ah)
• Internal IRQ Control Register (F3BAR0+Memory Offset
1Ch)
Internal IRQ Enable Register
The Internal IRQ Enable register configures the IRQs as
internal (software) interrupts or external (hardware) inter-
rupts. Any IRQ used as an internal software driven source
must be configured as internal.
Internal IRQ Control Register
The Internal IRQ Control register allows individual software
assertion/de-assertion of the IRQs that are enabled as
internal. These bits are used as masks when attempting to
write a particular IRQ bit. If the mask bit is set, it can then
be asserted/de-asserted according to the value in the low-
order 16 bits. Otherwise the assertion/de-assertion values
of the particular IRQ can not be changed.
6.2.12.5 LPC Interface
The LPC interface of the Core Logic module is based on
the Intel Low Pin Count (LPC) Interface specification, revi-
sion 1.0. In addition to the requirement pins that are speci-
fied in the Intel LPC Interface specification, the Core Logic
module also supports three optional pins: LDRQ#, SER-
IRQ, and LPCPD#.
The following subsections briefly describe some sections of
the specification. However, for full details refer to the LPC
specification directly.
The goals of the LPC interface are to:
• Enable a system without an ISA bus.
• Reduce the cost of traditional ISA bus devices.
• Use on a motherboard only.
• Perform the same cycle types as the ISA bus: memory,
I/O, DMA, and Bus Master.
• Increase the memory space from 16 MB to 4 GB to allow
BIOS sizes much greater.
• Provide synchronous design. Much of the challenge of
an ISA design is meeting the different, and in some
cases conflicting, ISA timings. Make the timings
synchronous to a reference well known to component
designers, such as PCI.
• Support software transparency: do not require special
drivers or configuration for this interface. The mother-
board BIOS should be able to configure all devices at
boot.
• Support desktop and mobile implementations.
• Enable support of a variable number of wait states.
• Enable I/O memory cycle retries in SMM handler.
• Enable support of wakeup and other power state transi-
tions.
Assumptions and functionality requirements of the LPC
interface are:
• Only the following class of devices may be connected to
the LPC interface:
— SuperI/O (FDC, SP, PP, IR, KBC) - I/O slave, DMA,
bus master (for IR, PP).
— Audio, including AC97 style design - I/O slave, DMA,
bus master.
— Generic Memory, including BIOS - Memory slave.
— System Management Controller - I/O slave, bus
master.
• Interrupts are communicated with the serial interrupt
(SERIRQ) protocol.
• The LPC interface does not need to support high-speed
buses (such as CardBus, 1394, etc.) downstream, nor
does it need to support low-latency buses such as USB.
Figure 6-15 shows a typical setup. In this setup, the LPC is
connected through the Core Logic module to a PCI or host
bus.
Figure 6-15. Typical Setup
PCI/Host BusISA (Optional)
LPC
KBC SP
PP FDC
Core Logic
SuperI/O Module
Module
- AMD Geode™ SC2200 Processor 1
- Data Book 1
- Contents 3
- List of Figures 5
- List of Tables 10
- 1.0Overview 13
- 1.2 Features 14
- Overview 16
- 2.0Architecture Overview 17
- 2.2 Video Processor Module 22
- 2.3 Core Logic Module 23
- 2.4 SuperI/O Module 23
- 2.5.1 Reset Logic 24
- 3.0Signal Definitions 25
- Signal Definitions 26
- 3.1 Ball Assignments 27
- SC2200 Processor 28
- 3.2 Strap Options 43
- 3.4 Signal Descriptions 48
- 3.4.9 IDE Interface Signals 59
- 3.4.16 GPIO Interface Signals 66
- (Continued) 69
- Reserved - RSVD 78
- 4.3 WATCHDOG 79
- 4.3.2 WATCHDOG Registers 80
- 4.4 High-Resolution Timer 81
- 4.5 Clock Generators and PLLs 83
- Circuitry 84
- Default ADL Multiplier 85
- 0111 33.33 4 0100 133 85
- 4.5.4 SuperI/O Clocks 86
- 4.5.6 Video Processor Clocks 86
- 4.5.7 Clock Registers 87
- 5.0SuperI/O Module 89
- 5.1 Features 90
- 5.2 Module Architecture 91
- 5.3.4 Address Decoding 93
- Configuration 98
- SuperI/O Module 100
- 5.5 Real-Time Clock (RTC) 105
- 5.5.3 RTC Registers 111
- Table 5-19. RTC Register Map 111
- Table 5-20. RTC Registers 111
- Table 5-25. Extended RAM Map 115
- Table 5-24. Standard RAM Map 115
- 5.6.1 Event Detection 116
- Type Name 117
- Type Name 117
- 5.7 ACCESS.bus Interface 121
- 5.7.3 Acknowledge (ACK) Cycle 122
- 5.7.6 Arbitration on the Bus 123
- 5.7.7 Master Mode 123
- 5.7.8 Slave Mode 125
- 5.7.9 Configuration 125
- 5.8 Legacy Functional Blocks 129
- Offset Name 130
- 404h EDR Data Bits 130
- Architecture 131
- Table 5-43. Bank 1 Bit Map 134
- Table 5-44. Bank 2 Bit Map 134
- Table 5-45. Bank 3 Bit Map 134
- Port 3 (SP3) Functionality 135
- Table 5-56. Bank 1 Bit Map 139
- Table 5-57. Bank 2 Bit Map 139
- Table 5-58. Bank 3 Bit Map 139
- Table 5-59. Bank 4 Bit Map 139
- Table 5-60. Bank 5 Bit Map 140
- Table 5-61. Bank 6 Bit Map 140
- Table 5-62. Bank 7 Bit Map 140
- 6.0Core Logic Module 141
- 6.2 Module Architecture 142
- 6.2.2 PSERIAL Interface 143
- 6.2.3 IDE Controller 144
- Core Logic Module 146
- 6.2.4 Universal Serial Bus 147
- 6.2.5 Sub-ISA Bus Interface 147
- 6.2.6 AT Compatibility Logic 152
- Figure 6-7. PIT Timer 154
- 6.2.8 Keyboard Support 157
- C1 Power State - Active Idle 158
- Sleep States 160
- 6.2.11 GPIO Interface 167
- 6.2.12 Integrated Audio 167
- AMD Geode™ 170
- Processor 170
- SMI# (System Management 171
- Read to Clear 172
- Figure 6-15. Typical Setup 173
- Table 6-12. Cycle Types 174
- 6.3 Register Descriptions 175
- 6.3.2 Register Summary 176
- 6.4 Chipset Register Space 190
- CPI mode 202
- . Reads as 0 220
- 20h and 24h) 221
- 1), this bit allows signal 230
- Not Used Reset Value: 00h 244
- . Must be set to 0 252
- 0 Reserved. (Read Only) 260
- Not Used 269
- : X-Bus Expansion Registers 278
- 00h/02h[14] 278
- Reserved Reset Value = xxh 291
- 7.0Video Processor Module 307
- 7.1 Module Architecture 308
- 7.2 Functional Description 309
- (Not normally User Data) 310
- Figure 7-4. VIP Block Diagram 311
- Video Processor Module 312
- 7.2.2 Video Block 315
- 7.2.3 Mixer/Blender Block 318
- Windows Configuration 321
- 7.2.5 Integrated DACs 323
- 7.2.6 TFT Interface 324
- crystal oscilla 325
- 7.3 Register Descriptions 326
- 8.0Debugging and Monitoring 349
- Debugging and Monitoring 350
- 9.0Electrical Specifications 351
- 9.1.4 Operating Conditions 352
- 9.1.5 DC Current 353
- Electrical Specifications 354
- 9.2 DC Characteristics 358
- 9.3 AC Characteristics 363
- GX1 Processor Series Data 365
- 9.3.2 Video Port 367
- 9.3.3 CRT and TFT Interface 368
- 9.3.4 ACCESS.bus Interface 370
- Note 2. t 371
- Ω1 KΩ 10 pF 373
- Figure 9-18. PCI Reset Timing 378
- 9.3.6 Sub-ISA Interface 379
- 9.3.7 LPC Interface 383
- 9.3.8 IDE Interface 384
- 9.3.11 Fast IR Port 407
- 9.3.13 Audio Interface (AC97) 412
- 9.3.14 Power Management 417
- 9.3.15 Power-Up Sequencing 418
- 9.3.16 JTAG Interface 420
- 10.0Package Specifications 423
- Figure 10-1. Heatsink Example 424
- 10.2 Physical Dimensions 425
- Package Specifications 426
- A.1 Order Information 427
- Table A-1. Revision History 428
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