Zilog EZ80F91 Manuel d'utilisateur télécharger pdf (Page 70)

eZ80F91 Development Kit

User Manual

UM014220-0508 Appendix A—General Array Logic Equations

Appendix A—General Array Logic

Equations

This appendix shows the equations for disabling the Ethernet signals pro-

vided by the U10 and U15 General Array Logic (GAL) devices.

U10 Address Decoder

//`define idle 2'b00

//`define state1 2'b01

//`define state2 2'b11

//`define state3 2'b10

// FOR eZ80 Development Platform Rev B

// This PAL generates 4 memory chip selects

module f92_decod(

nCS_EX, //Enables Extension Module's Memory when Low

nFL_DIS,//When Low, Module Flash is disabled (nDIS_FL=0),

//When High, nDIS_FL depends upon state of

//nmemenX

nCS0,

A7, //A23

A6, //A22

A5, //A21

A4, //A20

A3, //A19

A2, //A18

A1, //A17

A0, //A16

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Zilog EZ80F91 Manuel d'utilisateur Page 70