NEC 1080Xd manual Selecting a Slot

Models: 1080Xd

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Selecting a Slot

Selecting a Slot

Installation can impact the operating frequency of a board. Note the following information before selecting a PCI slot:

Manual backgroundNote: See Figure 5-2 for Core Module slot locations or Figure 5-4 for PCIX Unit slot locations. These figures slot frequencies and bus groups.

The actual operating frequency of a board is lower than the highest specified operating frequency when the following conditions occur:

!More than two PCI boards are installed in the same bus group (does not apply to PCI-X boards)

!Boards with different operating frequencies are installed in the same bus group.

PCI 33-MHz is the highest specified operating frequency for the following boards:

!Basic I/O Board

!SCSI Card DAT device in the server chassis.

See Table 5-3. for information about how installation in a particular slot and with other boards can determine the operating frequency of boards within the bus group.

Table 5-3. Board Installation and Operating Frequencies

Board Type

Installation

Operating Frequency

PCI 33-MHz

Installed within the same bus group with other

Operating frequency of all boards

board

boards having a higher operating frequency than

is 33 MHz.

 

33-MHz

 

 

 

 

PCI 66-MHz

Up to 2 boards installed within the same bus group

Operating frequency of boards is

board

 

66 MHz.

 

Three or more boards installed within the same bus

Operating frequency of all boards

 

group

is 33 MHz.

 

 

 

PCI-X 66-MHz

All slots within the same bus group are occupied

Operating frequency of all boards

board

with PCI-X 66-MHz boards

is 66-MHz.

 

 

Operating frequency does not

 

 

decrease as in PCI examples.

 

 

 

PCI-X 133-MHz

Installed in 66-MHz slot

Operating frequency is limited to

board

 

66 MHz; installation in 66-MHz

 

 

slot is not recommended.

 

 

 

5-6 I/O Board Installation

Page 178
Image 178
NEC 1080Xd manual Selecting a Slot