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architecture behavior of confirm is type state is (COUNT, RELAX, REPORT); signal PRESENT_STATE: state; signal ISUM: signal ICOUNT: UNSIGNED (3 downto 0) begin :- "0000'; -"0000; UNSIGNED (3 downto 0) process (CLK, RESET) begin if RESET -0' then PRESENT STATE <- COUNT; CONFIRM < '0'; elsif (CLK'event and CLK='1') then CONFIRM <= '0'; case state is when COUNT => if KEYPRESS='1' then ICOUNT <= ICOUNT + 1; ISUM <= ISUM + UNSIGNED (DATA); PRESENT STATE <= RELAX, elsif VERIFY='1' then PRESENT STATE <= REPORT; PRESENT STATE <= COUNT; else end if; when RELAX => if KEYPRESS='1' then else PRESENT STATE <= RELAX; PRESENT STATE <= COUNT; end if; when REPORT => if (ISUM-2 and ICOUNT=4) then CONFIRM <='1'; if VERIFY='1' then PRESENT_STATE <= REPORT; else PRESENT STATE <= COUNT; ISUM <='0000''; ICOUNT :=''000ơ' end if; when others => PRESENT STATE <= WAIT; CONFIRM <= '0'; end case; end if; end process; end behavior;

architecture behavior of confirm is type state is (COUNT, RELAX, REPORT); signal PRESENT_STATE: state; signal ISUM: signal ICOUNT: UNSIGNED (3 downto 0) begin :- "0000'; -"0000; UNSIGNED (3 downto 0) process (CLK, RESET) begin if RESET -0' then PRESENT STATE <- COUNT; CONFIRM < '0'; elsif (CLK'event and CLK='1') then CONFIRM <= '0'; case state is when COUNT => if KEYPRESS='1' then ICOUNT <= ICOUNT + 1; ISUM <= ISUM + UNSIGNED (DATA); PRESENT STATE <= RELAX, elsif VERIFY='1' then PRESENT STATE <= REPORT; PRESENT STATE <= COUNT; else end if; when RELAX => if KEYPRESS='1' then else PRESENT STATE <= RELAX; PRESENT STATE <= COUNT; end if; when REPORT => if (ISUM-2 and ICOUNT=4) then CONFIRM <='1'; if VERIFY='1' then PRESENT_STATE <= REPORT; else PRESENT STATE <= COUNT; ISUM <='0000''; ICOUNT :=''000ơ' end if; when others => PRESENT STATE <= WAIT; CONFIRM <= '0'; end case; end if; end process; end behavior;

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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architecture behavior of confirm is type state is (COUNT, RELAX, REPORT) ; signal PRESENT_STATE: state; signal ISUM: signal ICOUNT: UNSIGNED (3 downto 0) begin :- "0000' ; :-"0000' ; UNSIGNED (3 downto 0) process (CLK, RESET) begin if RESET - '0' then PRESENT STATE <= COUNT; CONFIRM < '0'; elsif (CLK'event and CLK='1') then CONFIRM <= '0'; case state is when COUNT => if KEYPRESS='1' then ICOUNT <= ICOUNT + 13; ISUM <= ISUM + UNSIGNED (DATA); PRESENT STATE <= RELAX; elsif VERIFY='1' then PRESENT STATE <= REPORT; else PRESENT STATE <= COUNT; end if; when RELAX => PRESENT STATE <= RELAX; PRESENT STATE if KEYPRESS='1' then else <= COUNT; end if; when REPORT => if (ISUM-2 and ICOUNT=4) then CONFIRM <='1'; if VERIFY='1' then PRESENT STATE <= REPORT; PRESENT STATE <= COUNT; else ISUM <='0000''; ICOUNT :=''0000'; end if; when others => PRESENT STATE <= WAIT; CONFIRM <= 'O'; end case; end if; end process; end behavior; Figure Q2
Transcribed Image Text:architecture behavior of confirm is type state is (COUNT, RELAX, REPORT) ; signal PRESENT_STATE: state; signal ISUM: signal ICOUNT: UNSIGNED (3 downto 0) begin :- "0000' ; :-"0000' ; UNSIGNED (3 downto 0) process (CLK, RESET) begin if RESET - '0' then PRESENT STATE <= COUNT; CONFIRM < '0'; elsif (CLK'event and CLK='1') then CONFIRM <= '0'; case state is when COUNT => if KEYPRESS='1' then ICOUNT <= ICOUNT + 13; ISUM <= ISUM + UNSIGNED (DATA); PRESENT STATE <= RELAX; elsif VERIFY='1' then PRESENT STATE <= REPORT; else PRESENT STATE <= COUNT; end if; when RELAX => PRESENT STATE <= RELAX; PRESENT STATE if KEYPRESS='1' then else <= COUNT; end if; when REPORT => if (ISUM-2 and ICOUNT=4) then CONFIRM <='1'; if VERIFY='1' then PRESENT STATE <= REPORT; PRESENT STATE <= COUNT; else ISUM <='0000''; ICOUNT :=''0000'; end if; when others => PRESENT STATE <= WAIT; CONFIRM <= 'O'; end case; end if; end process; end behavior; Figure Q2
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