MODULE busif

TITLE 'Bus interface for A4 ethernet card'

"CPLD DEVICE 'ispLSI2032EJ'

Declarations

" input pins
!S2, !S4, LA2, LA3, LA4, LA5 pin;
!WBE, !RST, CLK2, !PRE, !PWE pin;
ETHIRQ, !ECON pin;

" output pins
!OE245, CPAB, DIR245, DIR646, CPBA, !OE646 pin istype 'com';
!IOR, !IOW, RESET, SLEEP pin istype 'com';
!AEN pin 3 istype 'com';
PIRQ, EFIQ pin istype 'com';

EQUATIONS

AEN = S2 & LA2;
DIR245 = PWE;
OE245 = (S2 & ECON);
IOR = (PRE & ECON);
IOW = (PWE & ECON);
SLEEP = ECON;
OE646 = S2 & !LA2 & ECON;
CPAB = !PWE & ECON;
CPBA = !PRE & ECON;

PIRQ = 0;
PIRQ.oe = ETHIRQ;

EFIQ = 1;
EFIQ.oe = 0;

END