Intel® Server Board S2600CW Family TPS
Intel® Server Board S2600CW Functional Architecture
Revision 2.4
35
x16 225W card
-
75W from PCIe slot and 150W from PSU direct cable attach: 75W (2x3 conn) +
75W (2x3 conn) or
-
75W from PCIe slot and 150W from PSU direct cable attach: 75W (2x3 conn) +
75W (2x4 conn) or
-
75W from PCIe slot and 150W from PSU direct cable attach: 150W (2x4 conn)
x16 300W card
-
75W from PCIe slot and 225W from PSU direct cable attach: 75W (2x3 conn) +
150W (2x4 conn)
PCIe slot 6 supports risers. The riser slot supports standard x16 PCIe connector pin-outs. The
riser slots can support the following PCIe slot configurations:
Riser with two x4 PCIe slots
Riser with one x4 PCIe slot & one x8 PCIe slot
Riser with two x8 PCIe slots
Riser with one x16 PCIe slot
3.4.2
PCIe Enumeration and Allocation
The BIOS assigns PCI bus numbers in a depth-first hierarchy, in accordance with the PCI Local
Bus Specification, Revision 2.2. The bus number is incremented when the BIOS encounters a
PCI-PCI bridge device.
Scanning continues on the secondary side of the bridge until all subordinate buses are
assigned numbers. PCI bus number assignments may vary from boot to boot with varying
presence of PCI devices with PCI-PCI bridges.
If a bridge device with a single bus behind it is inserted into a PCI bus, all subsequent PCI bus
numbers below the current bus are increased by one. The bus assignments occur once, early
in the BIOS boot process, and never change during the pre-boot phase.
The BIOS resource manager assigns the PIC-mode interrupt for the devices that are accessed
by the legacy code. The BIOS ensures that the PCI BAR registers and the command registers
for all devices are correctly set up to match the behavior of the legacy BIOS after booting to a
legacy OS. Legacy code cannot make any assumption about the scan order of devices or the
order in which resources are allocated to them.
The BIOS automatically assigns IRQs to devices in the system for legacy compatibility. A
method is not provided to manually configure the IRQs for devices.
The following table shows the PCI layout for the Intel
®
Server Board S2600CW.
