ch375isa.pld

来自「CH375的源代码」· PLD 代码 · 共 38 行

Name       CH375ISA;
Designer   W.ch;
Device     g16v8;

/** Inputs **/
pin 1  = !iow ;
pin 2  = a1 ;
pin 3  = a4 ;
pin 4  = a5 ;
pin 5  = a6 ;
pin 6  = a7 ;
pin 7  = a8 ;
pin 8  = a9 ;
pin 9  = !aen ;
pin 11 = !ior ;
pin 13 = int ;
pin 16 = a17 ;
pin 17 = a16 ;
pin 18 = a15 ;

/** Outputs **/
pin 12 = d0 ;
pin 14 = !act ;
pin 15 = !usb ;
pin 19 = !rom ;

/** Declarations and Intermediate Variable Definitions  **/

field addr = [a9..4] ;

/** Logic Equations **/

rom = aen & !a17 & a16 & a15;
usb = aen & addr:['h'0260..026f] & !a1 & ( ior # iow );
act = aen & addr:['h'0260..026f] & ( ior # iow );
d0  = int;
d0.oe = aen & addr:['h'0260..026f] & a1 & ior;