Z:\Home\cse465\Projects\Project 2b - DSP in Verilog.doc Page 1 of 3 Project 2b: DSP in Verilog Design and build a co-processor that interfaces to the Leon that implements an FIR filter. Use memory mapped registers on the AMBA APB bus device 12 to communicate with the co-processor. Your C program (and Modelsim Testbench) will transmit the 16 bit filter coefficients and the 16 bit filter inputs to the co-processor, and receive the 16 bit results computed by the co-processor. Assume that the maximum length of the filter is 163. Verify that your co-processor is working correctly in simulation and in hardware. Measure the MAC/s rate that this system can sustain. Compare this to software DSP in part 2a. Report required that covers both parts a) and b) of this project. Hints: 1) Create a memory mapped register in the PSel12 space with the following format:: a. [2:0] – Op Code i. InitRAM ii. Convolve iii. Load Coefficient iv. Load Number of Taps b. [18:3] – 16 bit data to be passed to FSM – InitRAM value, coefficients, filter inputs c. [31] – Ready bit asserted by FSM indicating status – ready or busy.Z:\Home\cse465\Projects\Project 2b - DSP in Verilog.doc Page 2 of 3 2) Use the bubble diagram below as a starting point. 3) Make sure you check to make sure that your peripheral synthesizes cleanly in ISE before attempting to synthesize top. Init Parse Op Code Load Coeff Length Convolve Load Coeff CtrlReg[2:0]== 3 CtrlReg[2:0]== 2 CtrlReg[2:0]== 4 CtrlReg writeZ:\Home\cse465\Projects\Project 2b - DSP in Verilog.doc Page 3 of 3 Graphing Waveforms in Modelsim To view a signal as an analog wave highlight the signal and right click and select Properties… and then select the Format tab. The “Height” field is the total height in pixels, set this to something like 256. Then select Format -> Analog… and choose either interpolated for a smooth graph or step for the discreet steps. Then, set the offset to half of the range of values, in the case of a 16 bit number, 32768. Then set the scale to the height / number of steps in the signal, in this case 256 / 65536 or .0039. To view two waves overlaid on each other leave the second wave’s height as 17 and add that divided by the scale to the