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Draw the state transition diagram described by the VHDL of Figure Q4

Draw the state transition diagram described by the VHDL of Figure Q4

Database System Concepts
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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(a) Draw the state transition diagram described by the VHDL of Figure Q4 The VHDL of Figure Q4 is part of a digital system used to confirm the validity of a personal identification number. cach keypress rasing the KEYPRESS signal and placing the value of the key pressed on DATA. State the properties of a legal personal identification number. (b) architecture behavior of confinrm is type state is (COUNT, RELAX, REPORT) signal PRESENT STATE: state; sgnal ISUM: UNSIGNED (3 downto 0) 0000 variable ICOUNT: UNSIGNED (3 cownto O 00:0:% begin process (CLK, RESET) begin it RESET-0 then PRESENT STATE <= COUNT, CONFIRM <=0 eisit (CLK'event and CLK='1n then CONFIRM c0" case state is when COUNT > I KEYPRESS=1then ICOUNT ICOUNT +1: ISUM c ISUM DATA PRESENT STATE e RELAX. elsif VERIFY-1 then PRESsENT STATEc= REPORT: else end if, when RELAX=> if KEYPRESS-1then PRESENT STATE RELAX: PRESENT STATE COUNT PRESENT STATE COUNT else end it when REPORT => if (ISUM-1 and ICOUNT-4) then CONFIRM c1 end if VERIFY=1' then PRESENT STATE REPORT else PRESENT STATE <s COUNT, ISUM c C000 ICOUNT "o0007 end if, when others => PRESENT STATE <= COUNT CONFIRM c 0 end case: end it end process; end behavior, Figure Q4
Transcribed Image Text:(a) Draw the state transition diagram described by the VHDL of Figure Q4 The VHDL of Figure Q4 is part of a digital system used to confirm the validity of a personal identification number. cach keypress rasing the KEYPRESS signal and placing the value of the key pressed on DATA. State the properties of a legal personal identification number. (b) architecture behavior of confinrm is type state is (COUNT, RELAX, REPORT) signal PRESENT STATE: state; sgnal ISUM: UNSIGNED (3 downto 0) 0000 variable ICOUNT: UNSIGNED (3 cownto O 00:0:% begin process (CLK, RESET) begin it RESET-0 then PRESENT STATE <= COUNT, CONFIRM <=0 eisit (CLK'event and CLK='1n then CONFIRM c0" case state is when COUNT > I KEYPRESS=1then ICOUNT ICOUNT +1: ISUM c ISUM DATA PRESENT STATE e RELAX. elsif VERIFY-1 then PRESsENT STATEc= REPORT: else end if, when RELAX=> if KEYPRESS-1then PRESENT STATE RELAX: PRESENT STATE COUNT PRESENT STATE COUNT else end it when REPORT => if (ISUM-1 and ICOUNT-4) then CONFIRM c1 end if VERIFY=1' then PRESENT STATE REPORT else PRESENT STATE <s COUNT, ISUM c C000 ICOUNT "o0007 end if, when others => PRESENT STATE <= COUNT CONFIRM c 0 end case: end it end process; end behavior, Figure Q4
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