DIPLOMARBEIT - FG Mikroelektronik, TU Berlin

Technische Universität Berlin
Institut für Mikroelektronik
Lukas Bauer
RL_CALC
Diplomarbeit
Hochleistungs-Grafikprozessor in Speedchart-VHDL
T5
entry S1
Subdiag Actions of
A: -- determine number of VClk cycles
-- per memory word of video data
LD_XZ:=0 when XZ="000"
else 1 when XZ="001"
else 2 when XZ="010"
else 3 when XZ="011"
else 4 when XZ="100"
else 5 when XZ="101"
else 6 when XZ="110"
else 7;
LD_MBW:=5 when MBW(1)=’1’
else 4 when MBW="01"
else 3;
LD_PSIZE:=5 when R_PSIZE(5)=’1’
else 4 when R_PSIZE(5 downto 4)="01"
else 3 when R_PSIZE(5 downto 3)="001"
else 2 when R_PSIZE(5 downto 2)="0001"
else 1 when R_PSIZE(5 downto 1)="00001"
else 0;
CALC_RLL:=((HSBLNK-HEBLNK) + 65535) mod 65536;
-- (Register Line Length) -1
SUM_TE_V:=SUM_TAP_ELL mod 4096;
case SRL is
when "00" => -- SRL: 256 bits
SUM_TE_A:=SUM_TE_V(8);
SUM_TE_B:=SUM_TE_V(7);
CALC_ELL_SFT:=(CALC_ELL shr 8) mod 256;
when "01" => -- SRL: 512 bits
SUM_TE_A:=SUM_TE_V(9);
SUM_TE_B:=SUM_TE_V(8);
CALC_ELL_SFT:=(CALC_ELL shr 9) mod 256;
when "10" => -- SRL: 1024 bits
SUM_TE_A:=SUM_TE_V(10);
SUM_TE_B:=SUM_TE_V(9);
CALC_ELL_SFT:=(CALC_ELL shr 10) mod 256;
when "11" => -- SRL: 2048 bits
SUM_TE_A:=SUM_TE_V(11);
SUM_TE_B:=SUM_TE_V(10);
CALC_ELL_SFT:=(CALC_ELL shr 11) mod 256;
end case;
-- test output
MSCSFT_ot :=MSC_SFT mod 16;
Abbildung 66: Speedchart-Diagramm VIDEO/RELOAD/RL CALC
T1
A: -- determine number of VClk cycles
-- per memory word of video data
MSC_SFT:=(LD_XZ + LD_MBW) - LD_PSIZE;
Anhang C.2
Seite 99
case MSC_SFT is
when 0 => CALC_ELL:=CALC_RLL;
when 1 => CALC_ELL:=CALC_RLL shr 1;
when 2 => CALC_ELL:=CALC_RLL shr 2;
when 3 => CALC_ELL:=CALC_RLL shr 3;
when 4 => CALC_ELL:=CALC_RLL shr 4;
when 5 => CALC_ELL:=CALC_RLL shr 5;
when 6 => CALC_ELL:=CALC_RLL shr 6;
when 7 => CALC_ELL:=CALC_RLL shr 7;
when 8 => CALC_ELL:=CALC_RLL shr 8;
when 9 => CALC_ELL:=CALC_RLL shr 9;
when 10 => CALC_ELL:=CALC_RLL shr 10;
when 11 => CALC_ELL:=CALC_RLL shr 11;
when others => CALC_ELL:=CALC_RLL shr 12;
-- (Effective Line Length in mem words) -1
end case;