This is revision A of the EPROM GAL Plug28 and it is currently a work in progress.

EMDP1 GAL Plug28 Plug (Rev. A)

Table of Contents
Introduction
Schematic
Printed Circuit Board
Tables
Issues

Introduction

The EMDP1 GAL Plug28 plug is used to program the 26CV12 GAL.

Schematic

The schematic for this revision is shown below:

Printed Circuit Board

The following printed circuit board files exist:

plug28_artwork.png: The artwork layer picture (PNG).
plug28_back.png: The back layer picture (PNG).
plug28_front.png: The front layer picture (PNG).
plug28.gal: The artwork Gerber (RS274X) file.
plug28.gbl: The back (solder side) Gerber (RS274X) file
plug28.gtl: The front (component side) Gerber (RS274X) file.
plug28.gml: The mask (both sides) Gerber RS274X) file.
plug28.drl: The drill (Excellon) file.
plug28.tol: The tool file that lists hole counts.

Tables

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

Pin EMDP1 Name Connected To 26CV12 Chip Pin
1 SCL U1-SCL
2 GND Ground GND 21
3 SDA U1-SDA
4
5
6 +5V Vcc
7
8 BD0 PROG_LED
9 BD1 ZIF40 Pin 39 VIL 27
10 BD2 ZIF40 Pin 27 SDOUT 15
11 BD3 ZIF40 Pin 29 VIL 17
12 BD4 ZIF40 Pin 30 VIL 18
13 BD5 ZIF40 Pin 14 STB- 14
14 BD6 ZIF40 Pin 31 VIL 19
15 BD7 ZIF40 Pin 13 SDIN 13
16 BD8 ZIF40 Pin 32 VIL 20
17 BD9 ZIF40 Pin 11 RA5 11
18 BD10 Plug Pin 4 RA4 10
19 BD11 ZIF40 Pin 9 RA3 9
20 BD12 Plug Pin 6 SCLK 12
21 BD13 ZIF40 Pin 8 VIL 8
22 BD14 ZIF40 Pin 6 RA2 6
23 BD15 ZIF40 Pin 5 RA1 5
24 BD16 ZIF40 Pin 36 VIL 24
25 BD17 ZIF40 Pin 4 RA0 4
26 BD18 ZIF40 Pin 38 VIL 26
27 BD19 ZIF40 Pin 37 VIL 25
28 BD20 ZIF40 Pin 3 P/V- 3
29 BD21 Plug Pin 13 (ID0) Ground
30 BD22 Plug Pin 14 (ID1) Float
31 BD23 Plug Pin 15 (ID2) Ground
32 BD24 Plug Pin 16 (ID3) Ground
33 BD25 Ground
34 BD26 Ground
35 BD27
36 VAR1 Plug Pin 12 (V1) VCC 7
37 VAR2 ZIF40 Pin 2 EDIT 2
38
39
40

Pin	EMDP1 Name	Connected To	26CV12	Chip Pin
1	SCL	U1-SCL
2	GND	Ground	GND	21
3	SDA	U1-SDA
4
5
6	+5V	Vcc
7
8	BD0	PROG_LED
9	BD1	ZIF40 Pin 39	VIL	27
10	BD2	ZIF40 Pin 27	SDOUT	15
11	BD3	ZIF40 Pin 29	VIL	17
12	BD4	ZIF40 Pin 30	VIL	18
13	BD5	ZIF40 Pin 14	STB-	14
14	BD6	ZIF40 Pin 31	VIL	19
15	BD7	ZIF40 Pin 13	SDIN	13
16	BD8	ZIF40 Pin 32	VIL	20
17	BD9	ZIF40 Pin 11	RA5	11
18	BD10	Plug Pin 4	RA4	10
19	BD11	ZIF40 Pin 9	RA3	9
20	BD12	Plug Pin 6	SCLK	12
21	BD13	ZIF40 Pin 8	VIL	8
22	BD14	ZIF40 Pin 6	RA2	6
23	BD15	ZIF40 Pin 5	RA1	5
24	BD16	ZIF40 Pin 36	VIL	24
25	BD17	ZIF40 Pin 4	RA0	4
26	BD18	ZIF40 Pin 38	VIL	26
27	BD19	ZIF40 Pin 37	VIL	25
28	BD20	ZIF40 Pin 3	P/V-	3
29	BD21	Plug Pin 13 (ID0)	Ground
30	BD22	Plug Pin 14 (ID1)	Float
31	BD23	Plug Pin 15 (ID2)	Ground
32	BD24	Plug Pin 16 (ID3)	Ground
33	BD25	Ground
34	BD26	Ground
35	BD27
36	VAR1	Plug Pin 12 (V1)	VCC	7
37	VAR2	ZIF40 Pin 2	EDIT	2
38
39
40

The table below shows were each of the pins goes:

Pin 26CV12V8 BDx

1 VIL PD0

2 EDIT VAR2

3 P/V- BD20

4 RA0 BD17

5 RA1 BD15

6 RA2 BD14

7 VCC VAR1

8 VIL BD13

9 RA3 BD11

10 RA4 BD10

11 RA5 BD9

12 SCLK BD12

13 SDIN BD7

14 STB- BD5

15 SDOUT BD2

16 VIL PD1

17 VIL BD3

18 VIL BD4

19 VIL BD6

20 VIL BD8

21 GND GND

22 VIL PD2

23 VIL PD3

24 VIL BD16

25 VIL BD19

26 VIL BD18

27 VIL BD1

28 VIL PD4

Pin	26CV12V8	BDx
1	VIL	PD0
2	EDIT	VAR2
3	P/V-	BD20
4	RA0	BD17
5	RA1	BD15
6	RA2	BD14
7	VCC	VAR1
8	VIL	BD13
9	RA3	BD11
10	RA4	BD10
11	RA5	BD9
12	SCLK	BD12
13	SDIN	BD7
14	STB-	BD5
15	SDOUT	BD2
16	VIL	PD1
17	VIL	BD3
18	VIL	BD4
19	VIL	BD6
20	VIL	BD8
21	GND	GND
22	VIL	PD2
23	VIL	PD3
24	VIL	BD16
25	VIL	BD19
26	VIL	BD18
27	VIL	BD1
28	VIL	PD4

Issues