VGA Module Design

VGA$B%b%8%e!<%k$N:n@.(B

KITE$B%W%m%;%C%5$N$K@\B3$9$k(BVGA$B%b%8%e!<%k$r:n@.$7$^$9!#(B

VGA$B%b%8%e!<%k$N;EMM(B

$B%-%c%i%/%?$rI=<($9$k$b$N$H$7!"I=<(J8;z?t$O(B80x24$BJ8;z$H$9$k!#(B
$B%-%c%i%/%?$N9=@.$O(B8dot x 20line$B$H$7!"J8;z9=@.$O(B8dot x 16line$B$9$k!#(B
$B;D$j$N(B4$B%i%$%s$O%V%i%s%/%i%$%s(B($BL5I=<((B)$B$H$9$k!#(B
$B$7$?$,$C$F!"2hLLA4BN$N(B dot $B9=@.$O(B 640dot x 480line $B$H$J$k!#(B

$B2hLL9=@.!"J8;z9=@.!"(BKITE$B$K$*$1$k%a%b%j%^%C%W$NBP1~$r0J2<$K<($9!#(B

VGA$B%b%8%e!<%k$N%V%m%C%/?^(B

VGA$B%b%8%e!<%k$O!"

Video RAM$B!'2hLL$KI=<($9$kJ8;z$N(BJIS8$B%S%C%H%3!<%I$rJ];}$7$F$*$/%a%b%j!#(B $BI=<(J8;z?t$O(B80x24$BJ8;z$G$"$k$N$G!"(B8$B%S%C%H$G(B1,920$B%o!<%I$r5-21$G$-$kI,(B $BMW$,$"$k!#(B
$B:#2s$O(B8$B%S%C%H$N%-%c%i%/%?%3!<%I$rMQ$$$k$3$H$K$9$k$N$G!"(B8$B%S%C%H$G(B1,920$B%o!<%I$r5-21$G$-$l$P$h$$!#(B

Charactor ROM$B!'%-%c%i%/%?$NJ8;z>pJs$r5-21$7$F$*$/%a%b%j!#(BJIS8$B%S%C%H(B $B%3!<%I$N>l9g(B256$BJ8;z$G$"$k$N$G!"(B1$BJ8;z$N9=@.$,(B8x16line$B$N>l9g!"(B8$B%S%C(B $B%H(B4,096$B%o!<%II,MW$H$J$k!#(B
$B;D$j$N(B4$B%i%$%s$N%V%i%s%/%i%$%s(B($BL5I=<((B)$B$O Shift Register$B!'(BChar.ROM $B$+$iFI$_=P$7$?J8;z$N%I%C%H%G!<%?$r%I%C%H(B $B%/%m%C%/$K1~$8$F%7%U%H$7!"%7%j%"%k$K=PNO$9$k!#(B

VGA Controller$B!'(BVideo Memory, Char. ROM, Shift Register $B$N@)8f$*$h$SF14|(B $B?.9f$N@8@.$r9T$&%b%8%e!<%k$G$"$k!#FbIt9=@.$H$7$F$O!"$[$H$s$I$,%?%$(B $B%_%s%0D4@0MQ$N%+%&%s%?$G$"$k!#(B

VGA$B2hA|I=<($N9M$(J}(B

VGA$B%b%K%?$X$N2hA|I=<($O!"DL>o$N%F%l%S$HF1MM$K%i%9%?%9%-%c%s$GI=<($r9T$C(B $B$F$$$k!#(B

$B2hLL$NI=<($OBh(B1$B%i%$%s(B($B%i%9%?$H$$$&(B)$B$r:8$+$i1&$K8~$+$C$FC` $BF1MM$K!"?bD>J}8~$K$D$$$F$b!"I=<($5$l$F$$$J$$4|4V$K$*$$$F?bD>F14|?.9f$,=P(B $BNO$5$l$k!#(B
$B?^$K<($9$h$&$K!"?eJ?J}8~$*$h$S?bD>J}8~$N%?%$%_%s%0$r
CNT : $B?eJ?J8;z%I%C%H%+%&%s%?!'(B0$B!A(B7$B$^$G$r%+%&%s%H$9$k!#(B
HCNT : $B?eJ?J8;z%+%&%s%?!'(B0$B!A(B99$B$^$G$r%+%&%s%H$9$k!#(B
RCNT : $B%i%9%?%+%&%s%?!'J8;zKh$N%i%9%?$r(B0$B!A(B19$B$^$G%+%&%s%H$9$k(B
VCNT : $B?bD>J8;z%+%&%s%?!'(B0$B!A(B27$B$^$G$r%+%&%s%H$9$k!#(B

$B$3$N(B4$B8D$N%+%&%s%?$O0J2<$NMM$KF0:n$9$k!#(B

1$B%I%C%H$O(B25MHz$B$N(B1$B<~4|$N;~4V$G$"$k!#?eJ?J8;z%I%C%H%+%&%s%?(B(CNT)$B$O(B 25MHz$BKh$K%+%&%s%H%"%C%W$9$k!#(B
$B?eJ?J8;z%+%&%s%?(B(HCNT)$B$O(B8$B%I%C%HKh$K%+%&%s%H%"%C%W$9$k!#$D$^$j!"?eJ?(B $BJ8;z%I%C%H%+%&%s%?$,(B3'b111$B$+$i(B3'b000$B$K$J$k$H$-$K%+%&%s%H%"%C%W$9$k!#(B
$B$^$?!"(B99$B$^$G%+%&%s%H$9$k$N$G!"(B99$B$N $B%i%9%?%+%&%s%?(B(RCNT)$B$O?eJ?J8;z%+%&%s%?(B(HCNT)$B$,(B99$B$+$i(B0$B$K$J$k:]$K%+%&(B $B%s%H%"%C%W$9$k!#(B19$B$^$G%+%&%s%H$9$k$N$G(B19$B$N $B?bD>J8;z%+%&%s%?(B(VCNT)$B$O%i%9%?%+%&%s%?(B(RCNT)$B$,(B18$B$+$i(B0$B$K$J$k:]$K%+%&(B $B%s%H%"%C%W$9$k!#(B27$B$^$G$r%+%&%s%H$9$k$N$G(B27$B$N
$B?eJ?F14|?.9f$O!"(B84$BJ8;zL\$+$i(B95$BJ8;zL\$N4V$G=PNO$5$l$k!#(B
$B?bD>F14|?.9f$O!"(B26$BJ8;zL\$N4V$G=PNO$5$l$k!#(B

$B$3$l$i$N%+%&%s%?Ey$r `define HMAX 100 // H total Char. `define HSIZ 80 // H Size `define HSP 84 // H Sync. Pos. `define HSL 12 // H Sync. Len. `define HCR 8 // H dots per Char. `define VMAX 26 // V total Char. `define VSIZ 24 // V Size `define VSP 25 // V Sync. Pos. `define VSL 1 // V Sync. Len. `define VCR 20 // V lines per Char. module vram ( CLK, DCLK, RST, ADDR, DATAI, DATAO, MREQ, RW, ACK, R, G, B, HS, VS, DE ); input ...; output ...; ... endmodule $B$^$?!"%+%&%s%?$N@k8@$O0J2<$N$H$*$j$H$J$k!#(B

reg    [2:0] CNT;
reg    [6:0] HCNT;  // H Counter 0-99
reg    [4:0] VCNT;  // V Counter 0-27
reg    [4:0] RCNT;  // R Counter 0-19

VideoRAM$B$H(BChar.ROM$B$N%"%/%;%9J}K!(B

VGA$B%b%K%?$X$N2hA|I=<($O!"DL>o$N%F%l%S$HF1MM$K%i%9%?%9%-%c%s$GI=<($r9T$C(B $B$F$$$k!#(B

$B%/%m%C%/$O(B75MHz$B$H(B25MHz$B$,6!5k$5$l$F$$$k!#(B
KITE$B%W%m%;%C%5$+$i$N(BVRAM$B%"%/%;%9$O(B75MHz$B$KF14|$9$k!#(B
VGA$B%3%s%H%m!<%kIt$O$9$Y$F(B1dot$B$N%/%m%C%/$G$"$k(B25MHz$B$r4pK\$H$7$FF0:n$7$F$$$k!#(B
$B?^$K<($9$h$&$K(B1$BJ8;z$N2#$O(B3.125MHz$B$H$J$k!#(B
25MHz$B$r%7%U%H%/%m%C%/(B(1$B%I%C%HJ,$NI=<(%/%m%C%/(B)$B!"(B
25MHz$B$r(B8$BJ,<~$7$?(B3.125MHz$B$G%G%e!<%F%#Hf(B1/8$B$N%/%m%C%/$r%Q%$%W%i%$%s%l%8%9%?MQ$N%?%$(B $B%_%s%0%/%m%C%/$H$9$k!#(B

$B=PNO?.9f(B

DVI$B%S%G%*$N(BR, G, B$B$N3F=PNO$O(B8$B%S%C%H$G(B256$B3,D4$G$"$k!#(B
$B$7$+$7!":#2s$N@_7W$OC1?'$G$"$k$N$G!"8w$i$;$k>l9g$O(BR,G,B$B$H$b$K(B(FF)$B!"(B
$B8w$i$;$J$$>l9g$O(B(00)$B$r=PNO$9$k!#(B

HS, VS$B$NF14|?.9f$OIiO@M}$G$"$k$N$GCm0U$9$k!#(B

DE$B$OJ8;z$rI=<($5$;$k4|4V$K#1$H$9$k!#(B
$B$J$*!"%Q%$%W%i%$%sF0:n$7$F$$$k$?$a!"(B
HCNT$B$NCM$,(B0$A!+(B79$B$N$H$-$K(BDE$B$r#1$K$9$k$N$G$O$J$$$3$H$KCm0U$9$k!#(B

$B:G8e$K!"(Bkite_top$B3,AX$+$i$O0J2<$NMM$K8F$S=P$9$3$H$K$J$k!#(B
RST$B$H$7$F(BLOCKED$B?.9f$rMQ$$$F$$$k$N$O!"(BPLL$B$K$h$k%/%m%C%/$,0BDj$7$F$+$i(B
$B%3%s%H%m!<%k2sO)$rF0:n$5$;$k$?$a$G$"$k!#(B

  //
  // Memory & Video RAM
  //
  vram   mem1 ( .CLK (CLK75),
                .DCLK(CLK25),
                .RST(!LOCKED),
                .ADDR(ADR),
                .DATAI(DATAO[7:0]),
                .DATAO(VRAM_DATAO),
                .MREQ(MREQ),
                .RW(RW),
                .ACK(VRAM_ACK),
                .R(R),
                .G(G),
                .B(B),
                .HS(HS),
                .VS(VS),
                .DE(DE)
              );

| Back |

VGA$B%b%8%e!<%k$N:n@.(B

VGA$B%b%8%e!<%k$N;EMM(B

VGA$B%b%8%e!<%k$N%V%m%C%/?^(B

VGA$B2hA|I=<($N9M$(J}(B