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Department of Microelectronic Systems, Faculty of Electronics,
Telecommunications and Informatics, Gdansk University of Technology
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Real Time Clock
Exercise: Design and implement real time clock,
displaying time in format: HH.MM. Dot should pulse with 1 Hz frequency.
- Button BTN1 - setting hours.
- Button BTN0 - setting minutes.
- Button BTN2 - test button for fast running of clock (i.e. 1000 times faster)
to test the design in the lab.
- Button BTN3 - asynchronous reset.
Attention: Design has to be protected from switch bouncing (only for BTN0)!
It can be assumed, that after pressing the button, contacts may bounce
for up to 50ms.
The design has to contain frequency divider and display driver from previous
exercises, embedded as components.
Write a testbench.
Before implementing the design, a simulation must be run using the testbench.
UCF file, Digilent Spartan-3, Spartan-3 3S200 FT256-4:
#########################################################################################
# Clock:
NET "clk_i" LOC = "T9" ; # 50 MHz clock
#########################################################################################
#########################################################################################
NET "led7_an_o<3>" LOC = "E13" ; # leftmost digit, active low
NET "led7_an_o<2>" LOC = "F14" ; # active low
NET "led7_an_o<1>" LOC = "G14" ; # active low
NET "led7_an_o<0>" LOC = "d14" ; # rightmost digit, active low
#
NET "led7_seg_o<7>" LOC = "E14" ; # segment 'a', active low
NET "led7_seg_o<6>" LOC = "G13" ; # segment 'b', active low
NET "led7_seg_o<5>" LOC = "N15" ; # segment 'c', active low
NET "led7_seg_o<4>" LOC = "P15" ; # segment 'd', active low
NET "led7_seg_o<3>" LOC = "R16" ; # segment 'e', active low
NET "led7_seg_o<2>" LOC = "F13" ; # segment 'f', active low
NET "led7_seg_o<1>" LOC = "N16" ; # segment 'g', active low
NET "led7_seg_o<0>" LOC = "P16" ; # segment 'dp', active low
#########################################################################################
#########################################################################################
# Push-buttons:
# @ @ @ @
# btn3 btn2 btn1 btn0
NET "btn_i<0>" LOC = "M13" ; # active high
NET "btn_i<1>" LOC = "M14" ; # active high
NET "btn_i<2>" LOC = "L13" ; # active high
NET "btn_i<3>" LOC = "L14" ; # active high
#########################################################################################
Fig.1 Description of LED display connectors.
Example of displaying digit '2'
