48
6.2.5 Interrupt Request Lines (IRQ)
There are a total of 15 IRQ lines available on the Industrial CPU Card. Peripheral devices use
interrupt request lines to notify CPU for the service required. The following table shows the IRQ
used by the devices on the Industrial CPU Card.
Level Function
IRQ0 System
Timer
Output
IRQ1 Keyboard
IRQ2 Interrupt
Cascade
IRQ3
Serial Port #2
IRQ4
Serial Port #1
IRQ5 USB
IRQ6
- Reserved -
IRQ7
- Reserved -
IRQ8 Real
Time
Clock
IRQ9
- Reserved -
IRQ10 Display
Control
IRQ11 LAN
IRQ12 PS2
Mouse
IRQ13 FPU
IRQ14 Primary
IDE
IRQ15 - Reserved -
6.2.6 DMA Channel Map
The equivalent of two 8237A DMA controllers is implemented in the CPU2616 board. Each
controller is a four-channel DMA device that will generate the memory addresses and control
signals necessary to transfer information directly between a peripheral device and memory. This
allows high speeding information transfer with less CPU intervention. The two DMA controllers
are internally cascaded to provide four DMA channels for transfers to 8-bit peripherals (DMA1)
and three channels for transfers to 16-bit peripherals (DMA2). DMA2 channel 0 provides the
cascade interconnection between the two DMA devices, thereby maintaining IBM PC/AT
compatibility.
The following is the system information of DMA channels:
DMA Controller 1
DMA Controller 2
Channel 0: Spare
Channel 4: Cascade for controller 1
Channel 1: Reserved for IBM SDLC Channel 5: Spare
Channel 2: Diskette adapter
Channel 6: Spare
Channel 3: Spare
Channel 7: Spare
Содержание CPU-2616 PCI-104
Страница 6: ...1 2 Layout 5...
Страница 54: ...7 Appendix 7 1 Dimension 53...