Information Technology Reference
In-Depth Information
5.1.2 82371SB PCI ISA Xcelerator (PIIX3)
The PIIX3 is a 208-pin QFP (quad flat pack) IC that integrates much the functionality of the
ISA bus interface onto a single device. Table 5.1 outlines the main connections to the PIIX3
IC.
Table 5.1
PIIX3 connections
Address lines
IRQ Lines
ISA Lines
ISA Lines
Signal
Pin
Signal
Pin
Signal
Pin
Signal
Pin
AD0 206 IRQ1 4 BALE
64
SA8/DD0 55
AD1 205 IRQ3 58 AEN
20
SA9/DD1 50
AD2 204 IRQ4 56 LA17
86
SA10/DD2
49
AD3 203 IRQ5 34 LA18
84
SA11/DD3
48
AD4 202 IRQ6 33 LA19
82
SA12/DD4
47
AD5 201 IRQ7 32 LA20
80
SA13/DD5
46
AD6 200 -IRQ8 5 LA21
76
SA14/DD6
45
AD7 199 IRQ9 10 LA22
74
SA15/DD7
44
AD8 197 IRQ10 73 LA23
72
SA16/DD8
43
AD9 194 IRQ11 75 SA0
69
SA17/DD9
41
AD10 193 IRQ12/M 77 SA1
68
SA18/DD10
40
AD11 192 IRQ14 83 SA2
67
SA19/DD11
39
AD12 191 IRQ15 81 SA3
66
SA20/DD12
38
AD13 190
SA4
63
SA21/DD13
37
AD14 189
SA5
61
SA22/DD14
36
AD15 188
SA6
59
SA23/DD15
35
AD16 177
SA7
57
-OWS
15
AD17 176
DRQ0
87
-SMEMW
22
AD18 175
DRQ1
30
-SMEMR
19
AD19 174
DRQ2
12
-IOW
24
AD20 173
DRQ3
25
-IOR
23
AD21 172
DRQ5
91
-REFRESH
31
AD22 171
DRQ6
95
T/C
62
AD23 168
DRQ7
99
OSC
AD24 166
-DACK0
85
-MEMCS16
70
AD25 165
-DACK1
29
-IOCS16 71
AD26 164
-DACK2
60
-MASTER
AD27 163
-DACK3
21
IOCHK
6
AD28 162
-DACK5
89
IOCHRDY 18
AD29 161
-DACK6
93
-SBHE (DD12)
AD30 160
-DACK7
97
-MEMR
88
AD31 159
RSTISA
-MEMW
90
USB
Signal Pin
USBP1- 143
USBP1+ 142
USBP0- 145
USBP0+ 144
PIIX3's functionality includes:
•
Enhanced 7-channel DMA with two 8237 controllers. This is supported with the hand-
shaking lines DRQ0-DRQ7 and DRQ0#-DRQ7#.
•
ISA-PCI bridge.
•
Fast IDE support for up to four disk drives (two masters and two slaves). It supports
mode four timings, which gives transfer rates of up to 22MB/s.
•
I/O APIC (advanced programmable interrupt controller) support.
•
Implementation of PCI 2.1.
