architecture behavior of confirm is type atate is (COUNT, RELAX, REPORT); signal PRESENT STATE: atate; signal ISUM: signal ICOUNT: UNSIGNED (3 downto 0) t 0000, begin UNSIGNED (3 downto 0) : 0000: 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 end if; PRESENT STATE <= RELAX; PRESENT_STATE <= COUNT; 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 :=0000 end if; when others => PRESENT STATE <= WAIT; CONFIRM <= '0'; end case; end if; end process; end behavior;
architecture behavior of confirm is type atate is (COUNT, RELAX, REPORT); signal PRESENT STATE: atate; signal ISUM: signal ICOUNT: UNSIGNED (3 downto 0) t 0000, begin UNSIGNED (3 downto 0) : 0000: 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 end if; PRESENT STATE <= RELAX; PRESENT_STATE <= COUNT; 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 :=0000 end if; when others => PRESENT STATE <= WAIT; CONFIRM <= '0'; end case; end if; end process; end behavior;
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Transcribed Image Text:architecture behavior of confirm is
type atate is (COUNT, RELAX, REPORT);
signal PRESENT STATE: state;
signal ISUM:
Bignal ICOUNT: UNSIGNED (3 downto 0) t 0000,
begin
I 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;
PRESENT STATE <= COUNT;
else
end if;
when RELAX =>
PRESENT STATE <= RELAX;
PRESENT_STATE <= COUNT;
if KEYPRESS='1' then
else
end if;
when REPORT =>
if (ISUM-2 and ICOUNT-D4) then CONFIRM <='1';
if VERIFY='1' then PRESENT_STATE <= REPORT;
else
PRESENT STATE <= COUNT;
ISUM <=0000'; ICOUNT :='0000';
end if;
when others >
PRESENT STATE <= WAIT; CONFIRM <= '0';
end case;
end if;
end process;
end behavior;
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