HP Server rp7420 Installation Guide, Fifth Edition - HP 9000 rp7420 Server - Page 15

Introduction Overview of these high-speed bi-directional rope links for a total aggregate bandwidth of approximately 4 GB/sec. Each LBA acts as a bus bridge, supporting either one or two ropes and capable of driving 33 Mhz or 66 Mhz for PCI cards. The LBAs can also drive at 66 Mhz or 133 Mhz for PCI-X cards. Figure 1-4 PCI-X Board to Cell Board Block Diagram Cell Board Cell Controller (CC) Cell Board Cell Controller (CC) LBA System Backplane LBA System Bus Adapter (SBA) LBA 1 PCI Slot 8 LBA 2 PCI Slot 7 LBA 4 PCI Slot 6 LBA 6 PCI Slot 5 LBA 14 PCI Slot 4 LBA 12 PCI Slot 3 LBA 10 PCI Slot 2 LBA 8 PCI Slot 1 System Bus Adapter (SBA) LBA 1 PCI Slot 8 LBA 2 PCI Slot 7 LBA 4 PCI Slot 6 LBA 6 PCI Slot 5 LBA 14 PCI Slot 4 LBA 12 PCI Slot 3 LBA 10 PCI Slot 2 LBA 8 PCI Slot 1 NOTE PCI-X slots 1 through 7 are dual rope slots, while slot 8 is a single rope slot. The PCI-X backplane is the primary I/O interface for HP 9000 rp7420 Server systems. It provides sixteen 64-bit, hot-plug PCI/PCI-X slots. Fourteen of the slots have dual ropes connected to the LBA chips. The remaining two slots have a single rope connected to each LBA chip. Each of the sixteen slots are capable of 66 MHz/33 MHz PCI or 133 MHz/66 MHz PCI-X. All sixteen PCI slots are keyed for 3.3-volt connectors (accepting both Universal and 3.3-V cards). The PCI-X backplane does not provide any 5-volt slots for the I/O cards. See Table 1-1 for more details. The PCI-X backplane is physically one board but behaves like two independent partitions. SBA 0 and its associated LBAs and eight PCI-X slots form one I/0 partition. SBA 1 and its associated LBAs and eight PCI-X slots form the other I/0 partition. One I/O partition can be powered down separate from the other I/O partition. Chapter 1 15