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Revision: August 11, 2005 246 East Main | Pullman, WA 99163

(509) 334 6306 Voice and Fax

Overview

The Ceres board provides a ready-made

development platform for Digilent C-Mod

boards. It contains a 40-pin DIP socket to hold

C-Mods, and a collection of useful I/O devices

connected to the socket pins. The Ceres/C-

Mod board combination makes an ideal

platform for students or engineers who want to

experiment with modern design technologies

and/or Xilinx CPLD devices. The Ceres board

can operate from a wall-plug power supply

(included), or up to 40 hours on two AA

batteries. Ceres features include:

• An user-settable oscillator (0.5Hz - 4KHz);

• 4-digit, high-bright seven-segment display;

• 4 debounced buttons and 8 slide switches;

• 8 LEDs in three different colors (red, green,

and yellow);

• 40-pin Dip format receptacle for use with

the C-Mod line of boards;

• 40-pin expansion connector capability.

• Attached C-Mod boards can be

programmed with JTAG3 cable.

The Ceres/C-Mod board makes an excellent

platform for introducing programmable

technologies in instructional lab settings. The

C-mod boards can host a wide range of

designs, from simple logic circuits to complex

state machines. The CPLDs use non-volatile

configuration memory, so designs can be

completed outside the lab and brought in for

evaluation. The Ceres/C-mod combination is

fully compatible with all versions of the Xilinx

CAD tools, including the free WebPack tools

available at the Xilinx website. When

purchased in combination, the Ceres/C-Mod

ships with a programming cable and a power

source, so designs can be implemented

immediately without the need for any additional

hardware.

Functional description

The Ceres board provides a power supply and

collections of I/O devices that can be used by

C-Mod boards. Ceres boards can host different

C-Mod boards, so designs can easily be

retargeted to different CPLD devices for

experimentation. Current C-Mod boards

include the C-Mod 95 (XC9572XL), the C-Mod

C2 (XC2C64), and the C-Mod XCR

(XCR3064XL).

The Ceres board can be powered from a wall-

plug power supply or from a 2AA battery pack.

A 40-pin expansion connector makes all DIP

connector signals available to external circuits.

Ceres/C-Mod JTAG Configuration

C-Mod boards contain a JTAG port for

programming, but the Ceres board does not.

The C-Mod JTAG port consists of a pattern of

six offset holes that are not normally loaded

with header pins. A row of 6 unattached

header pins can be inserted into the end of a

JTAG3 cable, and the other side of the header

can be inserted into the offset hole patterns.

Expansion

Connector

C-Mod Board Socket

40-pin 600-mil DIP

Adjustable clock

(0.5Hz to 4KHz)

8 switches

8 LEDs

Four 7-seg.

displays

4 buttons

Debounce

Power/Battery

Jack

Figure 1. Ceres Block Diagram

1 2 3 4

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Seite 1 - (509) 334 6306 Voice and Fax

DDiiggiilleenntt CCeerreess RReeffeerreennccee MMaannuuaall TM www.digilentinc.com Revision: August 11, 2005 246 East Main | Pullman, WA 99163 (5

Seite 2 - 240 ohms

Ceres Reference Manual Digilent, Inc. www.digilentinc.com ® Digilent, Inc. Page 2 Once the C-Mod board is connected to the PC via the JTA

Seite 3 - Digit period = Refresh / 4

Ceres Reference Manual Digilent, Inc. www.digilentinc.com ® Digilent, Inc. Page 3 Seven Segment LED display The Ceres board contains a

Seite 4

Ceres Reference Manual Digilent, Inc. www.digilentinc.com ® Digilent, Inc. Page 4 Digit Cathode SignalsShowna b c d e f g 00

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Digilent Ceres Bedienungsanleitung

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