Appendix a, General array logic equations, U10 address decoder – Zilog EZ80190 User Manual

Page 78

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eZ80190 Development Kit

User Manual

UM014108-0810

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 l92_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

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