Core Logic - Micros Systems Workstation 4 LX Service Manual

Core Logic

The Core Logic of the SC3200 device includes the following PC AT functionality: a
USB interface, IDE interface, PCI Bus Interface, LPC (Low Pin Count) interface,
ACPI 1.0 compliant power management, Video Input Port (VIP), and support for an
audio codec.
Audio Interface (Not Supported)
• AC97/AMC97 (Rev 2.0) codec interface
• Legacy audio emulation using XpressAUDIO
• 6 DMA Channels.
PC AT Functionality
This block consists of the following components:
• Programmable Interrupt Controller (PIC), compatible with 8259A
• Programmable Interval Timer (PIT), compatible with 8254
• DMA Controller (DMAC) compatible with 8237.
Video Input Port
• Not Implemented on the WS4
Power Management
• ACPI 1.0 Compliant
• Sx state control of three power planes
• Gx/Sx state control of clocks and PLLs
• Wake-up event support.
General Purpose IO (GPIO) Ports
The SC3200 GPIO ports are used for a variety of tasks, including IDE bus control
signals, and RS232 COM1 handshake signals.
• 27 multiplexed GPIO signals.
Low Pin Count (LPC) Interface
The LPC Interface is based on the Intel
It is a PCI-like bus composed of seven signal lines and is used to replace the
legacy ISA bus. Other features include:
• Specification Rev 1.0 compatible
• Reduce the cost of traditional ISA bus devices
• Performs the same bus cycle types as ISA: memory, I/O, DMA, and Bus
Master
• Interrupts are communicated with the serial interrupt (SERIRQ) protocol.
Workstation 4 and 4 LX Field Service Guide
SC3200 GX1 Processor, Video Processor, Core Logic and Super IO
WS4 Technical Overview
®
Low Pin Count Interface Specification.
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