Technical data

Block Diagram
A-10
Ethernet Interface
The combo Video/Ethernet plug-in module also provides a PCI Fast Ethernet LAN
controller with a PCI clock speed up to 33MHz. It uses a 21143-Td single-chip
Ethernet controller for the PCI bus. It has a 10Base-T transceiver that supports full-
duplex operation on an10/100Mb/s port. It has a powerful on-chip DMA with
intelligent arbitration to prevent underflow or overflow of data, using two large (256
byte) independent receive and transmit FIFO buffers.
Network Interface Pin Assignments
Pin Number Function
1 Transmitter High
2 Transmitter Low
3 Receiver High
6 Receiver Low
Shield Ground
Others No connection
Peripheral Component Interconnect (PCI) Bus
The PCI bus provides three physical address spaces – two concurrent Primary PCI
buses and a Secondary PCI bus, providing enhanced decoding for:
•
32-bit memory
•
32-bit I/O
•
256 byte-per-agent configuration space.
The Primary PCI bus interfaces to PCI slots 1 and 2. The Secondary PCI bus
interfaces to PCI slots 3 through 6. The buses communicate between each other
through a PCI-to-PCI bridge (PPB). The PCI bus supports 8-bit, 16-bit, and 32-bit
data transfers at a bus clock speed of 30 or 33 MHz depending on the CPU speed.
This allows 32-bit data transfers at 120 MB per second.
PCI Bus Expansion
The MLB supports six PCI slots, including a shared PCI/ISA slot. Full bus mastering
is supported on all six PCI slots, allowing any PCI master peer-to-peer access to any
PCI slave.