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IPC8255/8254

DECISION COMPUTER INTERNATIONAL CO., LTD.

IPC8255/8254

Card Type

Data acquisition

Chipset

8254/8255

I/O Options

Digital I/O lines (24)

Data Bus

IPCCPU expansion bus

CONNECTIONS

Function

Label

Function

Label

IPCCPU expansion bus

P1

8254 clock signals (see pinout below)

P3

8255 digital I/O lines 1-24 (see pinout below)

P2

Unidentified

P4

P2 PINOUT

Function

Pin

Function

Pin

Channel 0 bit 0

1

Channel 1 bit 5

14

Channel 0 bit 1

2

Channel 1 bit 6

15

Channel 0 bit 2

3

Channel 1 bit 7

16

Channel 0 bit 3

4

Channel 2 bit 0

17

Channel 0 bit 4

5

Channel 2 bit 1

18

Channel 0 bit 5

6

Channel 2 bit 2

19

Channel 0 bit 6

7

Channel 2 bit 3

20

Channel 0 bit 7

8

Channel 2 bit 4

21

Channel 1 bit 0

9

Channel 2 bit 5

22

Channel 1 bit 1

10

Channel 2 bit 6

23

Channel 1 bit 2

11

Channel 2 bit 7

24

Channel 1 bit 3

12

Ground

25

Channel 1 bit 4

13

+5V DC power

26

P3 PINOUT

Function

Pin

Function

Pin

Channel 1 bit 0

1

Clock signal 1 in

8

Clock signal 0 in

2

Channel 1 bit 4

9

Channel 1 bit 1

3

Gate signal 1 out

10

Gate signal 0 out

4

Channel 1 bit 5

11

Channel 1 bit 2

5

Clock signal 1 out

12

Clock signal 0 out

6

Channel 1 bit 6

13

Channel 1 bit 3

7

Clock signal 2 in

14

P3 PINOUT (CONT)

Function

Pin

Function

Pin

Channel 1 bit 7

15

4.9152MHz clock signal

21

Gate signal 2 out

16

Inverse of clock signal 1 out

22

TO1 signal

17

2.4576MHz clock signal

23

Clock signal 2 out

18

Inverse of clock signal 2 out

24

9.8304MHz clock signal

19

Ground

25

Inverse of clock signal 0 out

20

+5V DC power

26

USER CONFIGURABLE SETTINGS

Setting

Label

Position

Card is first card

JP2

Pins 3 & 4 closed

 

Card is second card

JP2

Pins 1 & 2 closed

BASE I/O ADDRESS SELECTION

Setting

JP1/A

JP1/B

JP1/C

JP1/D

JP1/E

 

90h

Closed

Open

Open

Open

Open

 

A0h

Open

Closed

Open

Open

Open

B0h

Open

Open

Closed

Open

Open

 

C0h

Open

Open

Open

Closed

Open

 

E0h

Open

Open

Open

Open

Closed

CLOCK 0 RATE SELECTION

Setting

JP3/A

JP3/B

JP3/C

2.4576MHz

Open

Open

Closed

 

4.9152MHz

Open

Closed

Open

 

9.8304MHz

Closed

Open

Open

CLOCK 1 RATE SELECTION

Setting

JP4/A

JP4/B

JP4/C

2.4576MHz

Open

Open

Closed

 

4.9152MHz

Open

Closed

Open

 

9.8304MHz

Closed

Open

Open

CLOCK 2 RATE SELECTION

Setting

JP5/A

JP5/B

JP5/C

2.4576MHz

Open

Open

Closed

 

4.9152MHz

Open

Closed

Open

 

9.8304MHz

Closed

Open

Open

MISCELLANEOUS TECHNICAL NOTES

This card is designed to be used with Decision Computer International Co., Ltd.s IPCCPU board. See this document for more information.