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diff --git a/part_4/ex16/ex16_top.v b/part_4/ex16/ex16_top.v
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+//------------------------------
+// Module name: ex16_top
+// Function: top level module - pass audio input to output directly
+// Creator:  Peter Cheung
+// Version:  2.0
+// Date:     10 Nov 2016
+//------------------------------
+
+module ex16_top (CLOCK_50, SW, HEX0, HEX1, HEX2, 
+					DAC_SDI, DAC_SCK, DAC_CS, DAC_LD,
+					ADC_SDI, ADC_SCK, ADC_CS, ADC_SDO, PWM_OUT);
+
+	input			CLOCK_50;		// DE0 50MHz system clock
+	input [9:0]	SW;				// 10 slide switches to specify address to ROM
+	output [6:0] HEX0, HEX1, HEX2;
+	output 		DAC_SDI;			//Serial data out to SDI of the DAC
+	output 		DAC_SCK;				//Serial clock signal to both DAC and ADC
+	output		DAC_CS;			//Chip select to the DAC, low active
+	output 		DAC_LD;			//Load new data to DAC, low active	
+	output 		ADC_SDI;			//Serial data out to SDI of the ADC
+	output 		ADC_SCK;		// ADC Clock signal
+	output		ADC_CS;			//Chip select to the ADC, low active
+	input 		ADC_SDO;			//Converted serial data from ADC	
+	output		PWM_OUT;			// PWM output to R channel
+		
+	wire			tick_10k;		// internal clock at 10kHz
+	wire [9:0] 	data_in;		// converted data from ADC
+	wire [9:0] 	data_out;	// processed data to DAC
+	wire			data_valid;
+	wire			DAC_SCK, ADC_SCK;
+	
+	clktick_16  GEN_10K (CLOCK_50, 1'b1, 16'd4999, tick_10k);  	// generate 10KHz sampling clock ticks
+	spi2dac SPI_DAC (CLOCK_50, data_out, tick_10k, 		// send processed sample to DAC
+					DAC_SDI, DAC_CS, DAC_SCK, DAC_LD);		// order of signals matter
+	pwm PWM_DC(CLOCK_50, data_out, tick_10k, PWM_OUT);		// output via PWM - R-channel
+					
+	spi2adc SPI_ADC (												// perform a A-to-D conversion
+		.sysclk (CLOCK_50), 										// order of parameters do not matter
+		.channel (1'b1), 											// use only CH1
+		.start (tick_10k),
+		.data_from_adc (data_in),
+		.data_valid (data_valid),
+		.sdata_to_adc (ADC_SDI),
+		.adc_cs (ADC_CS),
+		.adc_sck (ADC_SCK),
+		.sdata_from_adc (ADC_SDO));		
+					
+	processor	ALLPASS (CLOCK_50, data_in, data_out);	// do some processing on the data
+	
+	hex_to_7seg		SEG0 (HEX0, data_in[3:0]);			
+	hex_to_7seg		SEG1 (HEX1, data_in[7:4]);			
+	hex_to_7seg		SEG2 (HEX2, {2'b0,data_in[9:8]});			
+		
+endmodule
+
+