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Architecture Of 8257

 


Architecture of 8257

 

Mode Set Register

 

Bit definitions of the mode set register

 

Rotating priority of DMA channels
 

Table: Priority operations of DMA channels

Priority Channel Just Serviced
  CH 0 CH 1 CH 2 CH 3
Highest priority CH 1 CH 2 CH 3 CH 0
  CH 2 CH 3 CH 0 CH 1
  CH 3 CH 0 CH 1 CH 2
Lowest priority CH 0 CH 1 CH 2 CH 3

 





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