>>980 もう少し資料を読んでから考えた方が良いと思うす。 http://www.research.ibm.com/journal/rd/461/tendler.html -------------------------------- The GX controller is responsible for controlling the flow of information into and out of the system. Typically, this would be the interface to an I/O drawer attached to the system. With the POWER4 architecture, however, this is also the point at which we would directly attach an interface to a switch for clustering multiple POWER4 nodes -------------------------------- http://www.redbooks.ibm.com/redpapers/pdfs/redp0193.pdf -------------------------------- The Fabric bus is similar in nature to the GX bus, but has dual 64-bit paths operating at 500 MHz to provide an aggregate data rate of 8 GB/s. -------------------------------- RemoteIOわGX busが接続されているI/Oコントローラと周辺チップを結ぶI/Oバスす。
それからHyperTransport自体もコヒーレントなバスでわ無いす。 http://www.commsdesign.com/news/OEG20020721S0007 -------------------------- The group [HyperTransport Consortium] has so far decided not to define a coherent version of the link and to instead let members, such as AMD, go their own way on that front. -------------------------- AMDが上位のレイヤーに実装しているだけということす。
Feature/Function HyperTransport Technology Bus Type Dual, unidirectional, point-to-point links Link Width 2, 4, 8, 16, or 32 bits Protocol Packet-based, with packets in multiples of four bytes (32 bits) Bandwidth (Each Direction) 100 to 6500 Mbytes/sec. Data Throughput Up to 12.8 Gigabytes/sec. Signaling 1.2-V Low-Voltage Differential Signaling (LVDS) with a 100-ohm differential impedance Multiprocessing Support Yes Memory Model Coherent and non-coherent ★