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User Guide hp Integrity Superdomehp 9000 Superdome > Chapter 1 Overview
PCI-X I/O |
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The new PCI-X I/O chassis holds PCI and PCI-X type I/O cards for the two new systems. Older Superdome systems used only the PCI cards and card cages. The chassis consists of the following three printed circuit assemblies: PCI-X I/O Backplane PCI-X I/O Power Board PCI-X I/O Transfer Board It also contains the necessary mechanical components required to support 12 PCI-X card slots. The I/O system architecture is shown in Figure 1-8 “I/O Subsystem Architecture”. This figure depicts the path between the system I/O backplane and the PCX-X card slots. The CC on each cell board communicates with the System Bus Adaptor (SBA) on the PCI-X card cage over the SBA link. The SBA link consists of both an inbound and an outbound link with an effective bandwidth of approximately 1 GB/sec. in each direction. The SBA converts the SBA link protocol into enhanced “ropes.” The SBA can support up to 16 of these high-speed bidirectional enhanced rope links for a total aggregate bandwidth of approximately 8 GB/sec. The Local Bus Adaptors (LBA) is connected to the I/O by either a single or dual enhanced ropes. The heart of the PCI-X I/O card cage backplane is SBA ASIC plus 12 LBA ASICs (one per PCI-X slot). The SBA communicates directly with the CC of the host cell board by way of a high bandwidth SBA link. The SBA spawns 16 enhanced ropes that communicate with the LBA chips. Each LBA, then, produces a single 64-bit PCI-X bus, which supports a single PCI/PCI-X card. The 16 enhanced ropes generated by the SBA are routed to the 12 LBAs chips. All PCI-X card slots can support PCI-X 133. Each slot is keyed for 3.3-volt signaling and can accept any universal or 3.3-Volt only PCI or PCI-X add-in card. Associated with each PCI-X slot is a hot swap controller, which enables the online addition, replacement, and deletion of individual PCI-X cards without disturbing the operation of other cards in the system. The LBA provides the control/status signals and internal registers necessary for firmware to control and monitor the power status of a PCI-X slot. It also provides firmware control of the Attention indicator LED. The Slot State indicator LED is driven directly by the hot swap controller. The PCI-X power board (PCI-X PB) contains six DC-DC converters, over-voltage protection, filter components, in-rush current limiting circuitry, the local power monitor (GIOLPM) CPLD, and various status and control logic devices. It provides DC power (+1.5,+1.8V, +3.3V, +5V, +12V, -12V and +5V_HK) to the PCI-X I/O backplane boards. The PCI-X PB mounts under the backplane board connected by the transfer board and secured by a frame to form one hot-swappable assembly. All electrical connections between the two boards are made by the transfer board. Each power board contains one power monitor, which enables and monitors the DC power converters and reports status to the utilities subsystem. The power monitor also contains a reset delay circuit and an ID transmitter circuit for REO cable exploration. The PCI-X I/O transfer board connects several power sources and utilities signals from the PCI-X PB to the PCI-X I/O backplane. Core I/O refers to the base set of I/O functions required by every partition. The core I/O card uses a standard full-length PCI-X form factor but adds a secondary edge connector in line with its PCI-X connector. PCI-X slot 0 on the I/O backplane has been designed to accommodate the Core I/O requirements without impeding that slot’s ability to support standard PCI-X add-in cards. Each partition must have at least one core I/O card in order to boot. Multiple core I/O cards may be present within a partition (one core I/O card is supported per I/O backplane). Only one card's partition interface, however, will be active at a time. Notice that this does not apply to the Ethernet portion of the board, which can be active on multiple boards at the same time. The MP communicates with Core I/O through a USB interface that is internal to the cabinet. The microprocessor on the Core I/O runs Partition Interface firmware. External interfaces are provided for system 10/100BT LAN. An external port may be added to support VGA and mouse. Windows Server 2003, Datatcenter requires a Windows-based LAN card as it does not use the LAN capability provided by the standard Core I/O card. |
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