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PCI slot priorities for the 5802 and 5877 expansion units
Learn about the PCI Express (PCIe) slots in the 5802 and 5877 expansion units.
System description
The 5802 and 5877 expansion units are 19-inch, rack-mountable, I/O expansion drawers that are designed to be attached to the system by using 12X double data rate (DDR) cables.
The expansion units can accommodate 10 generation-3 cassettes. These cassettes can be installed
and removed without removing the drawer from the rack. The expansion units do not support I/O
processor (IOP) adapters.
Notes:
- PCIe2 adapters that provide extra-high bandwidths aren’t supported in the 5802 and 5877 expansion units.
- If a PCI adapter with CCIN 577D is installed in location P1-C4 of a 5802 or 5877 expansion unit, do not complete the install procedure for the PCI adapter in location P1-C5 with the system power on. The install action with the power on might cause the PCI adapter in location P1-C4 to fail.
- If a PCI adapter with CCIN 577D is installed in location P1-C4 of a 5802 or 5877 expansion unit, you can complete the remove and replace procedures for the PCI adapter in location P1-C5 with the system power on. The remove action and the replace action of the PCI adapter in location P1-C5 with the power on does not cause the PCI adapter in location P1-C4 to fail.
Figure 1. Rear view. This
figure shows the rear view of the expansion unit.
| Location code | I/O chip | PCI host bridge (PHB) | Description |
|---|---|---|---|
| P1-C1 | I/O chip 1 | PHB1 | PCIe x8 slot |
| P1-C2 | PHB2 | ||
| P1-C3 | PHB3 | ||
| P1-C4 | I/O chip 2 | PHB4 | |
| P1-C5 | PHB5 | ||
| P1-C6 | PHB6 | ||
| P1-C7 | I/O chip 3 | PHB7 | |
| P1-C8 | PHB8 | ||
| P1-C9 | PHB9 | ||
| P1-C10 | PHB10 |
Slot priority
The slot priority for all adapters is P1-C1, P1-C4, P1-C2, P1-C5, P1-C3, P1-C6, P1-C7, P1-C8, P1-C9, and P1-C10.
There are three I/O chips. Each I/O chip controls three or four PCI host bridges (PHBs) and each PCIe slot connects directly to a PHB.
- One I/O chip controls slots P1-C1, P1-C2, and P1-C3.
- A second I/O chip controls slots P1-C4, P1-C5, and P1-C6.
- A third I/O chips controls slots P1-C7, P1-C8, P1-C9, and P1-C10.
For best performance, fill P1-C1, P1-C4, P1-C2, P1-C5, P1-C3, and P1-C6 first with the highest bandwidth adapters. Then, fill the remaining slots.
