User’s Manual
92
ECB-870 User’s Manual
DMA-channel Usage
The DMA circuitry incorporates the functionality of two 8237 DMA controllers with seven
programmable channels. The controllers are referenced DMA Controller 1 for channels 0-
3 and DMA Controller 2 for channels 4-7. Channel 4 is by default used to cascade the two
controllers.
DMA-channel
Description
Note
DMA0
Available for PC/104 interface & PCI slot
DMA1
Available for PC/104 interface & PCI slot
DMA2
Standard Floppy Disk Controller
DMA3
Parallel port, if using ECP mode
DMA4
Used for cascading
DMA5
Available for PC/104 interface & PCI slot
DMA6
Available for PC/104 interface & PCI slot
DMA7
Available for PC/104 interface & PCI slot