ClearPath Dorado 300/400/700/800/4000/4100 Server I/O Planning ...

PCI-Based I/O Hardware
The Dorado 4000 and 4100 use a PCI-e Host I/O card to interface with the I/O
Expansion Module. The SIOP is located in the I/O Expansion Module and has an inbuilt
Host Bridge interface to communicate with the PCI Channel Module.
The expansion rack
• Supports PCI revision 2.2
• Supports 64 bits, 33 MHz
• Supports 5.0-volt PCI cards or Universal add-in cards
See section 1.6.1 for more information on the PCI Host card.
The following are the styles for the expansion rack.
Table 1–5. Expansion Rack
Style Description
PCI645-EXT Expansion rack for the Dorado 300 and 400
DOR385-EXT PCI Channel Module for the Dorado 700, 4000 and
4100
The PCI cards in the expansion rack are controlled by the IOP that controls the PCI
Host Bridge Card. If the IOP card is an SIOP, all the cards in that expansion rack must
be HBAs. If the controlling IOP is a CIOP, the cards in that expansion rack can be either
Ethernet NICs or clock cards.
Note: CIOP is not supported on Dorado 400, 4000 or 4100.
1.3.8. Dorado 700/4000/4100 Expansion Rack or PCI Channel
Module (DOR385-EXT)
The following can be considered for the Dorado 700 Expansion Rack or the Dorado
4000 and 4100 PCI Channel Module:
• The PCI Expansion Rack or PCI Channel Module attached to the Dorado
700/4000/4100 IOP has seven slots.
• Slots 1 to 4 run at 66 MHz, while slots 5 to 7 run at 100 MHz.
• If there is exactly one active peripheral controller, it will realize greater bandwidth
if it resides in slots 5 to 7 as opposed to slots 1 to 4.
• The SBCON card (SIOP) and the Time Card run at a maximum frequency of 66
MHz. If installed in the IOP’s PCI expansion rack, the card will force the entire PCI
bus associated with that slot to run at a maximum frequency of 66 MHz.
Therefore, installing an SBCON card or Time Card in slot 5 will reduce the available
bandwidth on slot 6 and vice versa.
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