Digilent PmodUSB2 User Manual

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Revision: 3/11/05 215 E Main Suite D | Pullman, WA 99163

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Overview

The Digilent PmodUSB2 Module Board (the
USB2) is used to create a USB 2.0 connection
on any Digilent system board.

The USB2 is based on the Cypress
CY7C68013 USB controller and can be used
to configure system boards or exchange data
with a PC.

Digilent firmware in the Cypress USB controller
works with Digilent’s PC-based Adept software
to coordinate JTAG programming and user
data transfers. The data port uses a protocol
similar to the 14-signal “Enhanced Parallel
Port” (EPP) protocol.

The USB2 is compatible with all newer Digilent
system boards including the Spartan-3,
Pegasus, D2SB™, and D2FT™ boards. It can
also be used with the older D2 and D2E
boards for user data transfers, but not for
programming. For more information, see the
reference manuals at www.digilentinc.com

Features include:

• USB 2.0 connector

• status indicator LED

• Cypress CY7C68013 USB controller

• small form factor (3.00” x 2.20”).

.

Type B USB

Connector

Microchip
EEPROM

24AA128

Crystal

(24Mhz)

Expansion Connector

Module Bus

Cypress CY7C68013

JTAG

Regulator

3.3V

2.5VDC

Functional Description

The USB2’s Cypress USB controller is a
convenient USB 2.0 connection solution that
includes the USB interface and an 8051-based
processor.

Digilent firmware in the Cypress USB controller
uses a packet-transfer protocol for JTAG
programming and user data transfers.
Digilent’s Adept Suite software includes two
application programs, Export (for JTAG

4 User

LEDs

2 Status

LEDs

USB2 Circuit Diagram

2 Pushbuttons

1 Jumper

(Config Reset)

®

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Digilent USB2 Reference Manual Digilent, Inc.

programming) and Transport (for user data
transfers).

For JTAG programming, the Adept software
can transfer .bit or .svf files directly to the
Cypress USB controller where firmware then
drives the JTAG scan chain. For more
information see the Digilent Adept Reference

Manual at www.digilentinc.com

For data transfer between a system board and
an attached PC, Digilent’s Adept Software
Developers Kit contains the necessary DLLs,
APIs, and Windows drivers to allow users to
create their own USB2 transport applications.
Digilent also provides a VHDL reference
design. The VHDL source file “dpimref.vhd” is
available as a separate download. See the

Digilent Software Development Kit, the Digilent
Port Communications Reference Manual, and
the Digilent Parallel Interface Model Reference
Manual. They can all be downloaded from

www.digilentinc.com

The firmware in the Cypress USB controller
can be modified using the Cypress EZ-USB
Development kit available from Cypress. For
more information, see www.cypress.com
Digilent does not offer user support for
modifying the firmware.

USB2 Communications

The Adept software manages communications
with the USB2. It can identify a particular USB2
module using either a serial number or an ID
string. A unique serial number and the default
ID string “DModUsb” are programmed into the
USB2 and the serial number is printed on a
label affixed to the module. Digilent provides a
“USB Administrator” tool as part of the Adept
software that can be used to modify the 16­character ID string. See the Digilent Adept
Reference Manual for more information.

.

.

.

Communications Module dialog box in the
Adept Suite. See the Digilent Adept Reference
Manual for more information.

The USB2 should be connected to a system
board’s A1, B1, or C1 expansion connectors
for proper operation. It can be connected to
other expansion connectors, but JTAG
programming will not be available. It is
recommended that the system board be turned
off prior to connecting the module.

User I/O Devices

The USB2 contains several I/O devices,
including six status LEDs, two debounce
pushbuttons, and one 2-pin jumper.

Pushbuttons and Jumper

The pushbuttons and jumper are not used by
the Digilent firmware on the Cypress USB
controller, but they can be configured as inputs
with the Cypress EZ-USB Development Kit.

Status LEDs

LED1: Indicates that the Digilent firmware is
loaded and ready.

LED2: Indicates data activity on the USB2
Module.

LED3-6: Not currently used. They can be
configured as user outputs with the Cypress
EZ-USB Development Kit.

The USB2 can be used for JTAG programming
or user data transfers only after it has been
identified within the Adept software. The USB2
is identified by adding its serial number or ID
string to a Device Table accessed through the

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