Intel Pentium III Processor/840, Руководство пользователя, Страница: 77 / 151

Intel
®
Pentium
®
III Processor/840 Development Kit Manual C-1
PLD Code Listing C
--************************************************
-- Altera design file
--***********************************************
TITLE "port80";
SUBDESIGN port80
(
LFRAME_N, PCI_RST_N,HEX_CLK : input;
AGP_CLK,SERR_N : input;
LAD[3..0] : bidir;
LO_OUT[6..0] : output;
HI_OUT[6..0] : output;
LSERR_N : bidir;
LED_RESET : output;
)
variable
LED_SEL[1..0] : wire;
PRE_LED[1..0] : wire;
pre_LSERR_N : wire;
PRE_LO_OUT[6..0] : wire;
PRE_HI_OUT[6..0] : wire;
dlad : dff;
control : dff;
dout : dff;
data_low[3..0]: dff;
data_high[3..0] : dff;
hex : machine with states
(my_reset,IDLE,ADDR3,ADDR2,ADDR1,ADDR0,DIN_LOW,DIN_HIGH,
TARIN1,TARIN2,TAROUT1,TAROUT2,SYNC_RDY
);
ss: MACHINE WITH STATES ( s1,s2,s3,s4);
begin
ss.clk = AGP_clk;
CASE ss IS
WHEN s1 =>
if SERR_N == GND
THEN ss = s2;
else ss = s1;
end if;
pre_LSERR_N = VCC;
WHEN s2 =>
ss = s3;
pre_LSERR_N = GND;
WHEN s3 =>
ss = s4;
pre_LSERR_N = GND;
WHEN s4 =>
ss = s1;
pre_LSERR_N = GND;