Xycom XVME-653, Manual

Page: 59 / 113

Chapter 4 – Programming
4-3
IRQ Map
Table 4-3 AT-bus IRQ Map
Interrupt Description
IRQ 0 System Timer Tick
IRQ 1 Keyboard
IRQ 2 Reserved (Programmable Interrupt Controller)
IRQ 3 COM 2
IRQ 4 COM 1
IRQ 5 Ethernet LAN Controller
IRQ 6 Floppy Disk Controller
IRQ 7 Parallel Port (LPT1)
IRQ 8 Real-Time Clock
IRQ 9 Pin 4 - PIIX3 USB Interface
IRQ 10 Onboard Reset switch
IRQ 11 Pin 1 - Universe Chip (PCI Bridge)
IRQ 12 PS/2 Mouse
IRQ 13 Reserved (Numeric Data Processor)
IRQ 14 IDE Hard Disk Controller
IRQ 15 Reserved (Secondary IDE Controller)
Note
Serial and parallel port IRQs are available if software does not use the
ports or does not use the interrupt.
VME Interface
The VME interface is the Tundra Universe chip, which is a PCI bus-to-VMEbus bridge
device. The XVME-653/658 implements a 32-bit PCI bus and a 32/64-bit VMEbus inter-
face. The Universe chip configuration registers are located in a 64 KB block of PCI
memory space. This memory location is programmable and defined by PCI configuration
cycles. The Universe configuration registers should be set up using PCI interrupt calls
provided by the BIOS.
For information on accessing the PCI bus, refer to the PCI BIOS Functions section later
in this chapter.
Caution
The Universe II manual states that the Universe Control and Status Reg-
isters (UCSR) occupy 4 KB of internal memory. While this is true, the
Universe controller decodes the entire 64 KB region and shadows the 4
KB 16 times. Contact Tundra at www.tundra.com for a .pdf version of
the Universe II manual.