![]() ![]() The D’s are the parallel inputs and the Q’s are the parallel outputs. The following circuit is a four-bit parallel in parallel out shift register constructed by D flip-flops. Also Baud rate can be changed by modifying the parameter clockoutspeed. The Clock frequency can be easily modified using the parameter systemspeed. ![]() The VHDL Code for UART simply transmits data stored in the FPGA to PC. library ieee use ieee.std_logic_1164.all entity shift is port(C, SI : in std_logic SO : out std_logic) end shift architecture archi of shift is signal tmp: std_logic_vector(7 downto 0) begin process (C) begin if (C'event and C='1') then for i in 0 to 6 loop tmp(i+1) = tmp(i) end loop tmp(0) = SI end if end process SO = tmp(7) end archi Following is the VHDL code for an 8-bit shift-left register with a negative-edge clock, clock enable, serial in, and serial out. For parallel in parallel out shift registers, all data bits appear on the parallel outputs immediately following the simultaneous entry of the data bits. This Code consists of Clock input and Transmitter output from Spartan3 FPGA Image Processing Board Clock running at 50MHz. Following is the VHDL code for an 8-bit shift-left register with a positive-edge clock, serial in, and serial out. ![]()
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December 2022
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