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T e c h n i c a l I n f o r m a t i o n
Motherboard
Expansion Slots
EISA Slots
The six EISA bus slots on the motherboard provide for expansion and
performance enhancement. Two of these share a common chassis I/O
expansion slot with two of the PCI slots; if you use these EISA slots, you
cannot use the PCI slots.
All six slots have the capability of being bus masters. When EISA masters
arbitrate for the bus, not all slots are created equal. The following pairs of
slots share arbitration requests: 1 and 2, 3 and 4, and 5 and 6. Therefore,
in the round-robin scheme of letting EISA masters take over the bus,
ownership of it occurs in the following sequence: 1, 2, 3, 4, 5, 6, 1, 2, 3,
4, 5, 6,1, 2, 3, 4, 5, 6, etc.
The EISA bus, an extension of the Industry Standard Architecture (ISA)
bus, provides:
♦
32-bit memory addressing
♦
Type A transfers at 5.33 Mbytes per second
♦
Type B transfers at 8 Mbytes per second
♦
Burst transfers at 33 Mbytes per second
♦
8-, 16-, or 32-bit data transfers
♦
Automatic translation of bus cycles between EISA and ISA masters
♦
Interrupt sharing
Since EISA is fully backward compatible with ISA, you can install old or
new ISA add-in boards and software in your server.
PCI Slots
The five PCI (Peripheral Component Interconnect) bus slots on the
system board provide for expansion and performance enhancement.
Two of these slots share a common chassis I/O expansion slot with two
of the EISA slots; if you use these PCI slots, you cannot use the EISA
slots.
5-8 OWNER'S HANDBOOK
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