Teknor Industrial Computers TEK-CPCI-1000, Technical Reference Manual

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2-1
2. ONBOARD SUBSYSTEMS
The TEK-CPCI-1000 system board is built around a single chip host-to-PCI bridge (430HX
from INTEL) which makes the PCI bus accessible through 2mm Hard Metric connectors
for up to 7 loads: 4 masters, including the onboard Ethernet, and 3 slaves.
The 430HX interfaces with the onboard processor host bus and a dedicated memory data
bus, and provides second level cache (L2) and DRAM control functions.
The DRAM controller supports up to 512MB of main memory. Both Fast Page Mode
(FPM) and Extended Data Output (EDO) memory technology are supported. The PCI-to-
DRAM interface transfer rate can go up to 112MB/sec for read and 121MB/sec for write.
The 430HX allows the processor to sustain the highest possible bandwidth to the graphics
frame buffer at all frequencies. To conform with “modular” oriented environment, the
board does not provide video function. Video will be supported using a CompactPCI

video module connected directly on the PCI bus (Order TEK-1002 from TEKNOR).
Ethernet subsystem is directly connected to the PCI bus. As PCI target, this configuration
allows all accesses to the internal registers to be automatically mapped into free memory
and I/O space upon initialization of the system. The Ethernet controller chip operates as a
master and a slave on the PCI bus. As a master, it interacts with the system memory to
access data for transmission or deposit received data. As a slave, some internal control
structures are accessed by the CPU for read and write operations.
The Ethernet chip provides 3Kbyte FIFO for receive and 3Kbyte FIFO for transmit which
prevent data overruns or underruns while waiting for access to the PCI bus. While the chip
provides independent Receive and Command units, the TEK-CPCI-1000 can process
communication commands and receive incoming frame simultaneously without real-time
CPU intervention.
The TEK-CPCI-1000 also provides a PCI-to-ISA bridge (PIIX3) along with other features
such as fast IDE interface, and USB.