I'm make board with 8086 processzor + CPLD.
CPLD syntetize 8288 bus controler.
But how to determinate AD bus direction (input/output).
Not understod s0,s1,s2 pin.

please help.

Posted on 2006-06-05 01:32:33 by korte
8086 has pin 33 - mn/mx -> minimal mode (no bus controller) or maximal mode (with bus controller). in minimal mode pins st0-st2 means "DEN" (data enabled), "DT/R" (data transmit/receive = direction) and "M/IO" (memory/IO ports). when 8288 present maximal mode used, then those signals generated by 8288 bus controller, and st0-st2 used to control 8288 by cpu.

(i had not made 8086 system, but planned long ago, so, read some :) )

Posted on 2006-06-05 06:06:20 by Shoo