Pci Interrupts - GE VMIVME-7805 Hardware Reference Manual

Table 2-4 Interrupt Vector Table (Continued)
INTERRUPT NO.
IRQ
LINE
HEX DEC
2A 42
2B 43
2C 44
2D 45
2E 46
2F 47
30-60 48-96
61-66 97-102
67-6F 103-111
70 112 IRQ8
71 113 IRQ9
72 114 IRQ10
73 115 IRQ11
74 116 IRQ12
75 117 IRQ13
76 118 IRQ14
77 119 IRQ15
78-7F 120-127
80-F0 128-240
F1-FF 241-255

2.5.2 PCI Interrupts

Interrupts on Peripheral Component Interconnect (PCI) Local Bus are optional
and defined as "level sensitive," asserted low (negative true), using open drain
output drivers. The assertion and de-assertion of an interrupt line, INTx#, is
asynchronous to CLK. A device asserts its INTx# line when requesting attention
from its device driver. Once the INTx# signal is asserted, it remains asserted until
the device driver clears the pending request. When the request is cleared, the
device de-asserts its INTx# signal.
PCI defines one interrupt line for a single function device and up to four interrupt
lines for a multifunction device or connector. For a single function device, only
INTA# may be used while the other three interrupt lines have no meaning.
Figure 2-1 on page 33 depicts the VMIVME-7805/VME-7805RC interrupt logic
pertaining to operations and the PMC site.
Any function on a multifunction device can be connected to any of the INTx#
lines. The Interrupt Pin register defines which INTx# line the function uses to
request an interrupt. If a device implements a single INTx# line, it is called INTA#;
if it implements two lines, they are called INTA# and INTB#; and so forth. For a
multifunction device, all functions may use the same INTx# line, or each may
have its own (up to a maximum of four functions), or any combination thereof. A
single function can never generate an interrupt request on more than one INTx#
line.
The slave PIC accepts the interrupts through lines that are defined by the BIOS.
The BIOS defines which interrupt line to utilize depending on which system
requires the use of the line.
REAL MODE PROTECTED MODE
DOS 3.x+ Network Comm Same as Real Mode
DOS Internal Use Same as Real Mode
DOS Internal Use Same as Real Mode
DOS Internal Use Same as Real Mode
DOS Internal Use Same as Real Mode
DOS Print Spooler Driver Same as Real Mode
Reserved by DOS Same as Real Mode
User Available Same as Real Mode
Reserved by DOS Same as Real Mode
Real Time Clock
Redirect to IRQ2
Not Assigned
Not Assigned
Mouse
Math Coprocessor
AT Hard Drive
CompactFlash Drive
Reserved by DOS Same as Real Mode
Reserved for BASIC Same as Real Mode
Reserved by DOS Same as Real Mode
Standard Features 31