page 26 SBC-815ET-VER User’s Guide
System Architecture
The block diagram in the next section shows you how the SBC-815ET-VER gives you a
highly integrated system solution. The architecture includes two main VLSI chips, 82815
GMCH (Graphics and Memory Controller Hub) and 82801BA ICH2 (I/O Controller Hub),
to support Celeron/Pentium-III (FC-PGA/FC-PGA2) processor, SDRAM, 3D graphic
display, PCI bus interface, APM, ACPI compliant power management, USB port,
SMBus communication, and Ultra DMA/33/66/100 IDE Master. The on-board super I/O
chip, W83627HF, will support PS/2 Keyboard/Mouse, two UARTs, FDC, Hardware
Monitor, Parallel, Watch Dog Timer and Infrared interface. In addition, an Intel 82801BA
ICH2 integrated LAN controller provides a competitive fast Ethernet function.
The CPU socket is a Socket-370 type to support high availability, reliability, and easy
operation in general industry applications.
The 82815 Hub integrates memory controller and graphics capability (AGP). This
delivers AGP class graphics performance to PCs at reduced cost. It dynamically
allocates and deallocates system memory for complex 3D textures, preserving the
benefits of standard AGP addin solutions. Its 64-bit AGTL+ based host bus interface
and optimized 64-bit DRAM interface supports two 3.3V DIMMs at the maximum bus
frequency of 100/133 MHz. The 32-bit PCI bus interface supports four PCI masters for
external backplane support.
The 82801BA hub employs the Accelerated Controller Hub architecture, which makes a
direct connection from the graphics and memory to the IDE controllers. It supports 2-
channel dedicated Ultra DMA-33/66/100 IDE master interfaces, full Plug-and-Play
compatibility, an APIC (Advanced Programmable Interrupt Controller) interface, and an
internal real-time clock (RTC) to maintain system time and date. It also supports 3 USB
(Universal Serial Bus) 1.1 ports and PCI 2.1 Compliant operation. It fully supports
Operating System Directed Power Management according to the Advanced
Configuration and Power Interface (ACPI) specification. In addition, it is also linked via a
Firmware Hub Link bus to a 82802AB Firmware Hub to support BIOS read/write access.
Through the PCI bus, a PC87200 PCI-to-ISA bridge is built in for a highly integrated
PCI-to-ISA bridge solution for the best in industrial applications.
The super I/O chip W83627HF integrates two high-speed serial ports, one parallel port,
SIR interface, and a Watch Dog Timer (WDT), which is enabled by BIOS settings and
triggered by software, hardware monitoring, a FDD interface and a 8042 keyboard
controller with PS/2 mouse ports. The parallel port supports one PC-compatible printer
port (SPP, bi-direction), Enhanced Parallel Port (EPP), and Extended Capabilities Port
(ECP).
The PCI-to-ISA bridge supports a standard 16-bit ISA bus interface, which is useful for
all slower I/O operations. It also supports DiskOnChip (DOC) for an M-systems Flash
disk and ISA buffer driving for special I/O applications and multi-ISA slots.
Summary of Contents for SBC-815ET-VER
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