P0071 Terasic Technologies Inc, P0071 Datasheet - Page 83
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P0071
Manufacturer Part Number
P0071
Description
TPAD MULTIMEDIADEVELOPMENT KIT
Manufacturer
Terasic Technologies Inc
Series
tPAD, Cyclone®IVr
Specifications of P0071
Main Purpose
Reference Design, Tablet
Embedded
Yes, FPGA / CPLD
Utilized Ic / Part
EP4CE115
Primary Attributes
8-Inch TFT LCD, LED Backlight
Secondary Attributes
5-Megapixel Digital Image Sensor
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Figure 6-4
illustrates the setup for this demonstration.
Figure 6-4 The setup for the USB paintbrush demonstration
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Most USB applications and products operate as USB devices, rather than USB hosts. In this
demonstration, we show how the DE2-115 board can operate as a USB device that can be connected
to a host computer. As indicated in the block diagram in
Figure
6-5, the Nios II processor is used to
communicate with the host computer via host port on the DE2-115 board‟s Philips ISP1362 device.
After connecting the DE2-115 board to a USB port on the host computer, a software program has to
be executed on the Nios II processor to initialize the Philips ISP1362 chip. Once the software
program is successfully executed, the host computer will identify the new device in its USB device
list and asks for the associated driver; the device will be identified as a Philips PDIUSBD12
SMART Evaluation Board. After completion of the driver installation on the host computer, the next
step is to run a software program on the host computer called ISP1362DcUsb.exe; this program
communicates with the DE2-115 board.
In the ISP1362DcUsb program, clicking on the Add button in the window panel of the software
causes the host computer to send a particular USB packet to the DE2-115 board; the packet will be
received by the Nios II processor and will increment the value of a hardware counter. The value of
the counter is displayed on one of the board‟s 7-segment displays, and also on the green LEDs. If
the user clicks on the Clear button in the window panel of the software driver, the host computer
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