Zilog eZ80F92 Manual de usuario descargar pdf (Pagina 78)

eZ80F92 Development Kit

User Manual

UM013911-0607 Appendix A

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 WEB 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

nCS2,

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 86 87

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Zilog eZ80F92 Manual de usuario Pagina 78