Sun Microsystems Ultra 5, Руководство по обслуживанию

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C-4 Sun Ultra 5 Service Manual • February 2000
C.1.2 PCI-IDE Interface
The 32-bit, 66-MHz PCI bus is interfaced through a connector to the motherboard.
This interface operates at 66 MHz and interfaces to the APB ASIC. There are three
PCI buses: primary PCI bus, secondary PCI bus A, and secondary PCI bus B. This
section discusses the following topics.
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Section C.1.2.1 “Primary PCI Bus” on page C-4
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Section C.1.2.2 “Secondary PCI Buses” on page C-5
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Section C.1.2.3 “APB ASIC” on page C-5
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Section C.1.2.4 “PCIO ASIC” on page C-5
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Section C.1.2.5 “10-/100-Mbit Ethernet” on page C-5
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Section C.1.2.6 “EBus2 Interface” on page C-6
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Section C.1.2.7 “EIDE Interface” on page C-7
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Section C.1.2.8 “PCI-Based Graphics” on page C-9
C.1.2.1 Primary PCI Bus
The CPU module interfaces to the APB ASIC through the primary PCI bus. The
primary PCI bus is a 32-bit, 66-MHz bus. The primary PCI bus is 3.3-VDC bus only,
and there cannot be a 5-VDC device residing on this bus. In the Ultra 5 systems, the
primary PCI bus is a point-to-point bus between the CPU module and the APB
ASIC. There are no other devices or slots on the primary PCI bus.