This is revision A of the EMDP1 GAL20 plug and it is currently a work in progress.

EMDP1 GAL20 Plug (Rev. A)

Table of Contents
Introduction
Schematic
Printed Circuit Board
Tables
Issues

Introduction

The EMDP1 GAL20 plug is used to program the 16V8 and 18V10 20-pin GAL's.

Schematic

The schematic for this revision is shown below:

Printed Circuit Board

The following printed circuit board files exist:

gal20_artwork.png: The artwork layer picture (PNG).
gal20_back.png: The back layer picture (PNG).
gal20_front.png: The front layer picture (PNG).
gal20.gal: The artwork Gerber (RS274X) file.
gal20.gbl: The back (solder side) Gerber (RS274X) file
gal20.gtl: The front (component side) Gerber (RS274X) file.
gal20.gml: The mask (both sides) Gerber RS274X) file.
gal20.drl: The drill (Excellon) file.
gal20.tol: The tool file that lists hole counts.

Tables

The table below shows were each of the BD signals winds up:

ZIF
Pin GAL
Pin 16V8 18V10 EMDP1
Pin
1 1 VIL VIL BD14
2 2 EDIT EDIT VAR2
3 3 RA1 RA3 BD15
4 4 RA2 RA4 BD2
5 5 RA3 RA5 BD4
6 6 RA4 SCLK BD6
7 7 RA5 SDIN BD8
8 8 SCLK STB- BD10
9 9 SDIN SDOUT BD12
10 10 GND GND GND
31 11 STB- VIL BD11
32 12 SDOUT VIL BD9
33 13 VIL VIL BD7
34 14 VIL VIL BD5
35 15 VIL VIL BD3
36 16 VIL RA2 BD1
37 17 VIL RA1 BD0
38 18 RA0 RA0 BD13
39 19 P/V- P/V- BD16
40 20 VCC VCC VAR1

ZIF Pin	GAL Pin	16V8	18V10	EMDP1 Pin
1	1	VIL	VIL	BD14
2	2	EDIT	EDIT	VAR2
3	3	RA1	RA3	BD15
4	4	RA2	RA4	BD2
5	5	RA3	RA5	BD4
6	6	RA4	SCLK	BD6
7	7	RA5	SDIN	BD8
8	8	SCLK	STB-	BD10
9	9	SDIN	SDOUT	BD12
10	10	GND	GND	GND
31	11	STB-	VIL	BD11
32	12	SDOUT	VIL	BD9
33	13	VIL	VIL	BD7
34	14	VIL	VIL	BD5
35	15	VIL	VIL	BD3
36	16	VIL	RA2	BD1
37	17	VIL	RA1	BD0
38	18	RA0	RA0	BD13
39	19	P/V-	P/V-	BD16
40	20	VCC	VCC	VAR1

Issues