How did they get eg pollx and grant-x from REQX? library ieee;use ieee.std_logic_1164.all;entity switch isport ( CLK, RESET, REQX, REQY, REQZ : in STD LOGIC;GNTX, GNTY, GNTZ: out STD LOGIC);end switch;architecture behavior of switch istype state is (poll_x, poll_y, poll_z, grant_x, grant_y, grant_z);signal PRESENT_STATE, NEXT_STATE : state;beginprocess(CLK, RESET)beginif RESET='1' then --asynchronous active HIGH resetPRESENT_STATE <= poll_x;elsif CLK='1' and CLK'event thenPRESENT STATE <= NEXT_STATE;end if;end process;process(PRESENT_STATE, REQX, REQY, REQZ)beginGNTX <= '0'; GNTY <= '0'; GNTZ <= '0';case (PRESENT_STATE) iswhen poll_x=> if REQX = '1' thenNEXT STATE <= grant_x;elseNEXT STATE <= poll_y;end if;when poll_y=> if REQY = '1 thenNEXT_STATE <= grant_y;elseNEXT STATE <= poll_z;end if;when poll_z=> if REQZ = '1' thenNEXT STATE <= grant_z;elseNEXT_STATE <= poll_x;end if;when grant_x=> GNTX <= '1';if REQX = '1' thenNEXT_STATE <= grant_x;elseNEXT_STATE <= poll_y;end if;when grant_y=> GNTY <= '1';if REQY = '1' thenNEXT_STATE <= grant_y;elseNEXT STATE <= poll_z;end if;when grant_z=> GNTZ <= '1';if REQZ = '1' thenNEXT_STATE <= grant_z;elseNEXT STATE <= poll_x;end if;when others=> NEXT_STATE <= poll_x;end case;

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How did they get eg pollx and grant-x from REQX?

Computer Networking: A Top-Down Approach (7th Edition)

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Author:James Kurose, Keith Ross

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Question

How did they get eg pollx and grant-x from REQX?

library ieee;
use ieee.std_logic_1164.all;
entity switch is
port ( CLK, RESET, REQX, REQY, REQZ : in STD LOGIC;
GNTX, GNTY, GNTZ: out STD LOGIC);
end switch;
architecture behavior of switch is
type state is (poll_x, poll_y, poll_z, grant_x, grant_y, grant_z);
signal PRESENT_STATE, NEXT_STATE : state;
begin
process(CLK, RESET)
begin
if RESET='1' then --asynchronous active HIGH reset
PRESENT_STATE <= poll_x;
elsif CLK='1' and CLK'event then
PRESENT STATE <= NEXT_STATE;
end if;
end process;
process(PRESENT_STATE, REQX, REQY, REQZ)
begin
GNTX <= '0'; GNTY <= '0'; GNTZ <= '0';
case (PRESENT_STATE) is
when poll_x=> if REQX = '1' then
NEXT STATE <= grant_x;
else
NEXT STATE <= poll_y;
end if;
when poll_y=> if REQY = '1 then
NEXT_STATE <= grant_y;
else
NEXT STATE <= poll_z;
end if;
when poll_z=> if REQZ = '1' then
NEXT STATE <= grant_z;
else
NEXT_STATE <= poll_x;
end if;
when grant_x=> GNTX <= '1';
if REQX = '1' then
NEXT_STATE <= grant_x;
else
NEXT_STATE <= poll_y;
end if;
when grant_y=> GNTY <= '1';
if REQY = '1' then
NEXT_STATE <= grant_y;
else
NEXT STATE <= poll_z;
end if;
when grant_z=> GNTZ <= '1';
if REQZ = '1' then
NEXT_STATE <= grant_z;
else
NEXT STATE <= poll_x;
end if;
when others=> NEXT_STATE <= poll_x;
end case;

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