Datasheet

dc890bf

DEMO MANUAL DC890B

OPTIONAL CONNECTIONS TO THE DC890B

USEFUL SOFTWARE TOOLS

The PScope software includes tools for automatic software

updates and for quickly retrieving documentation from

the world wide web.

NOTE: Adobe Acrobat Reader is required to view the docu-

ments and is available at

http://www.adobe.com.

To update the PScope software (requires an internet

connection):

• Choose Update Program from the tools menu.

This automatically updates the main program and drivers

for individual demo circuits.

• In CMOS mode the DC890B can operate from the USB

power, however in LVDS mode, the Spartan-III FPGA IO

ring drivers draw considerable supply current to bias

the active LVDS terminations. The DC890B has provi-

sions for a 5mm power plug for an external 6V ±0.5V

supply. The DC890B automatically detects the presence

of external power and disables the USB power input.

• X1: The DC890B has provisions for an external trigger

input, edge selectable by software. This permits initiat-

ing data block capture by an external event.

• J2: A JTAG connector is provided for downloading

custom FPGA software to the board. Grounding pin 3

of J2 automatically puts the FPGA into JTAG program-

ming mode. User developed code can be loaded into the

FPGA without compromising the factory installed code.

Jumper pins 4 and 6 of PIC programming connector

J1 to disable the microcontroller when using custom

FPGA code. Refer to the schematic for further details.

This feature is provided due to customer requests.

Development of custom code will not be supported

by the factory.

• J7 and J8 locations (not installed) provide access to

six additional FPGA pins for test purposes. These pins

also drive LED indicators useful for debug purposes.

Xilinx provides logic analysis and data collection features

through JTAG via ChipScope.