Digilent Ceres Manual do Utilizador descarregar pdf (Página 4)

Ceres Reference Manual Digilent, Inc.

www.digilentinc.com ® Digilent, Inc. Page 4

Digit Cathode Signals

Shown

a b c d e f g

0

0 0 0 0 0 0 1

1 1 0 0 1 1 1 1

2

0 0 1 0 0 1 0

3

0 0 0 0 1 1 0

4

1 0 0 1 1 0 0

5

0 1 0 0 1 0 0

6

0 1 0 0 0 0 0

7

0 0 0 1 1 1 1

8

0 0 0 0 0 0 0

9

0 0 0 1 1 0 0

Figure 9. Sseg cathode signals for digits

Expansion connector

An expansion connector labeled J1 is included

on the edge of the Ceres board to allow

designs to be expanded beyond the board. No

connector is loaded during manufacturing to

allow greater flexibility (so that wire-wrap pins

can be loaded, or a male or female connector).

All available CPLD signals are routed to the

connector, including signals that drive on-

board devices. Where feasible, on-board

devices are decoupled from the CPLD with

series resistors so that all pins may be used as

inputs or outputs by the expansion connector.

VCC and GND are also routed to the

connector so that attached devices can draw

power from the Ceres board. Table 1 shows

the signals routed to the expansion connector.

40 Pin DIP Socket

The Ceres Board is designed to accept any

one of several C-Mod boards. C-Mods can

easily be inserted into or removed from the 40

pin DIP socket. To add or change a C-Mod

board, power off the Ceres (disconnect the

power supply), remove an existing C-Mod

board if needed, and press the new C-Mod into

the DIP socket, ensuring that Pin 1 on the C-

Mod is aligned with Pin 1 on the socket. Table

2 shows the signals routed to the 40-pin DIP

socket.

Table 1. Ceres expansion connector pinout

Pin

Signal

Pin

Signal

Pin

Signal

Pin

Signal

1 GND 11

SW4 21

NC 31

LED4

2 VU 12

BTN2 22

AN1 32

CE

3 VCC 13

SW3 23

NC 33

LED3

4 NC 14

BTN1 24

AN2 34

CD

5 SW7 15

SW2 25

LED7 35

LED2

6 NC 16

BTN0 26

AN3 36

CC

7 SW6 17

SW1 27

LED6 37

LED1

8 NC 18

DP 28

CG 38

CB

9 SW5 19

SW0 29

LED5 39

LED0

10

BTN3 20

AN0 30

CF 40

CA

Table 2. Ceres board 40-DIP pinout

Pin

Signal

Pin

Signal

Pin

Signal

Pin

Signal

1 CA 11

CG 21

GND 31

LED6

2 CB 12

AN3 22

SW6 32

LED5

3 CC 13

AN2 23

SW5 33

BTN0

4 CD 14

AN1 24

SW4 34

BTN1

5 NC 15

AN0 25

SW3 35

MCLK

6 NC 16

SW7 26

SW2 36

LED4

7 NC 17

DP 27

SW1 37

LED3

8 NC 18

BTN3 28

BTN2 38

LED2

9 CE 19

NC 29

SW0 39

LED1

10

CF 20

VCC 30

LED7 40

LED0

1 2 3 4

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