(a)Draw the state transition diagram described by the VHDL of Figure Q4The VHDL of Figure Q4 is part of a digital system used to confirm thevalidity of a personal identification number. cach keypress rasing theKEYPRESS signal and placing the value of the key pressed on DATA. State theproperties of a legal personal identification number.(b)architecture behavior of confinrm istype state is (COUNT, RELAX, REPORT)signal PRESENT STATE: state;sgnal ISUM: UNSIGNED (3 downto 0) 0000variable ICOUNT: UNSIGNED (3 cownto O 00:0:%beginprocess (CLK, RESET)beginit RESET-0 thenPRESENT STATE <= COUNT, CONFIRM <=0eisit (CLK'event and CLK='1n thenCONFIRM c0"case state iswhen COUNT >I KEYPRESS=1then ICOUNT ICOUNT +1:ISUM c ISUM DATAPRESENT STATE e RELAX.elsif VERIFY-1 then PRESsENT STATEc= REPORT:elseend if,when RELAX=>if KEYPRESS-1then PRESENT STATE RELAX:PRESENT STATE COUNTPRESENT STATE COUNTelseend itwhen REPORT =>if (ISUM-1 and ICOUNT-4) then CONFIRM c1end ifVERIFY=1' then PRESENT STATE REPORTelsePRESENT STATE PRESENT STATE <= COUNT CONFIRM c 0end case:end itend process;end behavior,Figure Q4

Draw the ate transition diagram described by the VHDIL

Answered: Draw the state transition diagram…

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

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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Question

(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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