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Appendix C
Functional Description
C-19
C.1.5
ASICs
System ASICs include APB, PCIO, and RISC.
C.1.5.1
APB
The advanced PCI bridge (APB) ASIC provides a connection path between the
primary PCI bus and the two secondary PCI buses. APB features include:
■
32-bit memory addressing for PIO, 64-bit memory addressing (DACs) for DMA
■
16-bit I/O addressing
■
Full concurrences for primary and secondary PCI interfaces
■
72-byte FIFO data buffering on each of the DMA and PIO paths
■
Arbitration/prioritization
■
PIO reads and writes are in non-cacheable memory space
B50
Key
B73
INTD3_L
B51
Key
B74
Gnd
B75
INTD4_L
B85
Gnd
B76
CLK2
B86
Gnd
B77
INTB2_L
B87
+5V
B78
Gnd
B88
+5V
B79
+5V
B89
+5V
B80
CLK3
B90
+5V
B81
INTB3_L
B91
Gnd
B82
Gnd
B92
Reserved
B83
INTB4_L
B93
Reserved
B84
CLK4
B94
Gnd
TABLE C-6
PCI Riser Board Pin Assignment (Continued)
Pin Number
Signal
Pin Number
Signal
Содержание Ultra 5
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Страница 16: ...xvi Sun Ultra 5 Service Manual February 2000 FIGURE C 20 JP1 JP2 Jumper Settings for the Flash PROM C 39...
Страница 40: ...1 2 Sun Ultra 5 Service Manual February 2000 FIGURE 1 1 Ultra 5 System Monitor System Keyboard Mouse...
Страница 46: ...1 8 Sun Ultra 5 Service Manual February 2000...
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Страница 246: ...D 6 Sun Ultra 5 Service Manual February 2000...