P0071 Terasic Technologies Inc, P0071 Datasheet - Page 113
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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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Nios II Processor
Software Device Drivers
HAL API
MicroC/OS-II
NicheStack TCP/IP Software Component
Application Specific System Initialization
Web Server Application
Figure 6-33 Nios II Program Software Architecture
Finally, the detail descriptions for Software flow chart of the Web Server program are listed in
below:
Firstly, the Web Server program initiates the MAC and net device then calls the get_mac_addr()
function to set the MAC addresses for the PHY. Secondly, it initiates the auto-negotiation process to
check the link between PHY and gateway device. If the link exists, the PHY and gateway devices
will broadcast their transmission parameters, speed, and duplex mode. After the auto-negotiation
process has finished, it will establish the link. Thirdly, the Web Server program will prepare the
transmitting and receiving path for the link. If the path is created successfully, it will call the
get_ip_addr() function to set up the IP address for the network interface. After the IP address is
successfully distributed, the NicheStack™ TCP/IP Stack will start to run for Web Server application.
Figure 6-34
describes this demo setup and connections on DE2-115. The Nios II processor is
running NicheStack™ on the MicroC/OS-II RTOS.
Note: your gateway should support DHCP because it uses DHCP protocol to request a valid
IP from the Gateway, or else you would need to reconfigure the system library to use static IP
assignment. Furthermore, the web server demonstration uses the RGMII or MII interface to
access the TCP/IP. You can switch the MAC Interface via JP1 and JP2 for Ethernet 0 and
112
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