Cypress Semiconductor FX2LP Guia de Instalação descarregar pdf (Página 23)

EZ-USB Development Board Page -19

6.0 Appendix A: U2 (GAL) code (file is 'FX2LP.ABL')

MODULE fx2lp

" Swapped dipswitch settings 00 and 10 on 4-3-98 to allow the all-switch-

on default

x,c,z = .X.,.C.,.Z.;

"Inputs

A12,A13,A14,A15 pin 11,12,13,16;

A11 pin 4;

nRD,nPSEN,CLKOUT pin 6,5,2;

mm1,mm0 pin 9,7;

"Outputs

EA,nRAMOE,nRAMCE pin 21,25,27;

PF0,PF1,PF2,PF3 pin 17,18,19,20 istype 'reg_sr';

modesw = [mm1,mm0]; " two dipswitches

addr = [A15,A14,A13,A12,A11,nRD];" high nibble of the address bus + RD

equations

" The 3681 board turns PF0 on at 0x80xx reads and off at 0x81xx reads.

" This board turns PF0 on at 0x8xxx reads and off at 0x88xx reads.

PF0.S = (addr == ^b100000);

PF0.R = (addr == ^b100010);

PF0.CLK = CLKOUT;

PF1.S = (addr == ^b100100);

PF1.R = (addr == ^b100110);

PF1.CLK = CLKOUT;

PF2.S = (addr == ^b101000);

PF2.R = (addr == ^b101010);

PF2.CLK = CLKOUT;

PF3.S = (addr == ^b101100);

PF3.R = (addr == ^b101110);

PF3.CLK = CLKOUT;

WHEN (modesw == 00) THEN" No external memory

{

nRAMCE = 1;

nRAMOE= 1;

EA = 0;

}

ELSE WHEN(modesw == 01) THEN" Ext P&D mem at 8000 (can add mem to 0-8K)

{

!nRAMCE= A15;

!nRAMOE= !nRD # !nPSEN;" Combine program & data memory

EA = 0;

}

ELSE WHEN(modesw == 11) THEN" Ext P&D mem at 0000 and 8000

{

!nRAMCE = 1;

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