University of Toronto ECE532 Digital Hardware Module m04 Adding the XPS EMAC Peripheral Version for EDK 10 1 03 as of January 7 2009 Acknowledgement This lab is derived from a Xilinx lab given at the University of Toronto EDK workshop in November 2003 Many thanks to Xilinx for allowing us to use and modify their material Goals Understand the procedure for adding more complex peripherals to an XPS project Use XPS to manually add the XPS 10 100 EMAC Lite peripheral to the MicroBlaze system Search through more documentation to see where to find various bits of information and examples Prerequisites Module m03 Adding IP and Device Drivers Timers and Interrupts Preparation Read through this module first to get an idea of what you are about to do Find the data sheet for the XPS Ethernet Lite Media Access Controller EMACLite and review it In this lab you will be modifying an example program that can be found in the Processor IP drivers library for the device On the Microprocessor lab machines look in XILINX EDK sw XilinxProcessorIPLib drivers emaclite v1 13 a examples On the ECF Linux machines look in XILINX ED XILINX EDK sw XilinxProcessorIPLib drivers emaclite v1 13 a examples The first step is to copy the previous lab into a directory called lab4 If you like you can delete the lab3 c source file from your lab4 code directory You should of course check to see if you have enough space first You may need to clean up some files You can do this using the XPS interface i e via Project Clean all generated files using the facilities provided by the system make makefile e g start by trying make f system make you might need to first use dos2unix on system make if you re running make on an UGSPARC or an ECF Linux machine or by simply deleting the implementation directory in your project since it is automatically generated and since it consumes the bulk of your project s disk space In this module you will be working with the example called xemaclite intr tapp example c Copy the file from the driver example directory You will be asked to modify it so that it will work with your system You might want to try to understand what it does so that you will not have to spend time during a lab period doing this You can also make some modifications or add some xil printf statements Put the copied and possibly modified xemaclite intr tapp example c in lab4 code 1 University of Toronto ECE532 Digital Hardware Module m04 Adding the XPS EMAC Peripheral Background As peripherals become more complex there are more signals to be brought out of the FPGA and possibly more timing issues including the need for timing constraints and Digital Clock Managers DCMs The DCM is a block in the FPGA that contains functions like Delay Locked Loops DLLs that can be used to help synchronize internal logic and clocks with external logic and their clocks You will not have to deal with them in this lab In this lab you will be connecting the FPGA to an external Ethernet chip Ethernet is a widely used peripheral so it is beneficial to learn how to properly include the XPS EMAC into an XPS project Outside of the FPGA is the physical layer interface PHY chip that actually connects to the Ethernet cable on one side and the FPGA pins on the other side The EMAC is the peripheral that is inside the FPGA that connects from the FPGA pins to the PLB bus of the MicroBlaze allowing the processor to talk to the Ethernet chip This module is built on top of Module m03 It expects a MicroBlaze system with an interrupt controller and serial Uart device for standard I O If you didn t successfully add the DIP switch in m03 you can build onto the simpler design Note that the clock frequency must be greather than or equal to 65MHz for the Ethernet core to be able to operate at 100MBps as such the design implemented in this lab can only be expected to operate at 10MBps which requires a clock frequency of only 6 5MHz Using XPS Base System Builder 1 Copy the XPS project directory of the previous lab and rename the copy to lab4 if you have not done so already This will be the working project directory for this lab You may need to clean the project or delete the implementation directory of the previous module to free up disk space 2 Open the lab4 project using XPS 3 Add an xps ethernetlite peripheral to the system use version 2 00 a Define the base address of the device to be aligned at a 8K boundary following the address of the last peripheral in the list Attach the EMAC as a slave to the PLB bus 4 Make the PHY ports of the xps ethernetlite 0 peripheral instance external except for PHY rx en PHY rst n which should only be made external if you are using the XUPV2P board Be careful not to make both the bidirectional signal and the individual unidirectional components of that signal external For instance make PHY Mii data external and leave PHY Mii data I PHY Mii data O and PHY Mii data T as No Connection Later you will use the board user s guide or schematic for information on pin assignments for each signal 5 There are two pins on the PHY that are connected to the FPGA but that do not have corresponding ports in the EMAC device These signals are inputs to the PHY and should be tied high i e tied to net vcc in the design Click Add External Port in the Ports tab to create a system port Name the port xps ethernetlite 0 PHY slew0 pin make it an output and connect it to net vcc Do the same for xps ethernetlite 0 PHY slew1 pin 6 Connect the IP2INTC Irpt signal of the xps ethernetlite 0 peripheral instance to a new net called xps ethernetlite 0 IP2INTc Irpt Recall that the interrupt controller can handle a number of interrupt input request lines The interrupt input of the controller is really a vector of signals not a single wire Since there may be other interrupt signals already connected to the interrupt input of the interrupt controller the EMAC interrupt output may need to be concatenated to those signals 2 University of Toronto ECE532 Digital Hardware Module m04 Adding the XPS EMAC Peripheral To add a new signal to the interrupt input of the controller click on the entry in the Net column beside the Intr input of the xps intc 0 peripheral instance In the dialog that opens select the interrupt signal you wish to add Click on the plus symbol to add signals the scissors symbol to remove signals and the arrows to change the order of signals in the list on the right Note that the order of the list reflects the priority of the interrupt sources 7 Add the following