INDUSTRIAL GRADE CPU BOARD User’ s Guide
AR-B1479 INDUSTRIAL GRADE CPU BOARD User' s ... - Acrosser
AR-B1479 INDUSTRIAL GRADE CPU BOARD User' s ... - Acrosser
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AR-B1479 <strong>User’</strong>s <strong>Guide</strong><br />
2.6 DMA CONTROLLER<br />
! DMA channel<br />
! 2X8237/AT compatible 7-channel DMA controller.<br />
! 2X8259/AT compatible interrupt Controller.<br />
16 interrupt inputs – ISA and PCI.<br />
! Three 8254 compatible Timer/Counters.<br />
! Co-processor error support logic.<br />
The figure below describes a complete implementation of the external glue logic for DMA Request timemultiplexing<br />
and DMA Acknowledge demultiplexing. Like for the interrupt lines, this logic can be simplified when<br />
only few DMA channels are used in the application. This glue logic is not needed in Local bus mode and it does not<br />
support DMA transfers.<br />
Typical DMA multiplexing and demultiplexing<br />
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