IBM 8687 Installation Guide - Page 24

CEC 1 CPU 1 CPU 2 CPU 3 CPU 4 400 MHz 3.2 GBps 32 MB Processor & L4 cache 3.2 GBps cache controller SDRAM SDRAM SDRAM SDRAM 3.2 GBps 3.2 GBps 3.2 GBps Memory controller 100 MHz 2 GBps CEC 2 CPU 4 CPU 3 CPU 2 CPU 1 SMP Expansion Ports (3.2GBps) RXE Expansion Port B (1 GBps) 3.2 GBps 400 MHz Processor & 32 MB cache controller 3.2 GBps L4 cache 3.2 GBps Memory controller 3.2 GBps 3.2 GBps 2 GBps 100 MHz SDRAM SDRAM SDRAM SDRAM RXE Expansion Port A (1 GBps) PCI bridge 66 MHz 66 MHz 33 MHz Ultra160 SCSI Video USB Gigabit Ethernet Kbd/Ms RSA Bus A PCI bridge B-100 C-133 D-133 IBM XA-32 core chipset 64-bit 64-bit 64-bit 66 MHz 100 MHz 133 MHz Figure 1-5 xSeries 440 system block diagram - two SMP Expansion Modules When two SMP Expansion Modules are installed, they are connected together using two 3.2 GBps SMP Expansion Ports. The third scalability port is not used in this single-node eight-way configuration. The two PCI bridges in the XA-32 chipset provide support for 33, 66, 100, and 133 MHz devices using four PCI-X buses (labeled A-D in Figure 1-5). This is discussed further in 1.8, "PCI subsystem" on page 23. The PCI bridge also has a 1 GBps bi-directional Remote Expansion I/O port (RXE port) for connectivity to the RXE-100 enclosure. This port is labeled "RXE Expansion Port A" in both Figure 1-4 on page 8 (four-way) and Figure 1-5 (eight-way). The RXE-100 provides up to an additional 12 PCI-X slots. When the second SMP Expansion Module is installed to form an eight-way system (Figure 1-5), the second RXE port, labeled "RXE Expansion Port B", connects to the memory controller of the second SMP Expansion Module. 10 IBM ^ xSeries 440 Planning and Installation Guide