DIPLOMARBEIT - FG Mikroelektronik, TU Berlin

Technische Universität Berlin
Institut für Mikroelektronik
Lukas Bauer
Diagram Variables:
-- Variables of Diagram RELOAD
-- MSC control
Diplomarbeit
Hochleistungs-Grafikprozessor in Speedchart-VHDL
DISINC: logic:=’1’; -- ’1’ = disable TAPCNT increment
DISCLK: logic:=’1’; -- ’1’ = disable MSC output
MSCNT: int12:=0x0FFF; -- XZoom: counter for MSC/LD divider
MSCNTV(12): logic; -- MSCNT as a logic vector
TAPCNT: int11:=0; -- TAP position counter
TAPCNTV(11): logic; -- TAPCNT as a logic vector
ROWCNT: int12:=0; -- current row in SR
-- determine number of VClk cycles per memory word of video data
LD_XZ: int4; -- ld of XZOOM factor
LD_MBW: int4; -- ld of memory bus width
LD_PSIZE: int4; -- ld of bits per pixel
MSC_SFT: int4:=0; -- ld of (VClk cycles per mem word)
-- determine the number of reloads necessary in the next line
Anhang C.2
Seite 92
CALC_RLL: int16; -- (Register Line Length) -1
CALC_ELL: int16:=0; -- (Effective Line Length in VClk cycles)-1
CALC_NRL: int8 :=0; -- # of low half SR reloads in next line
CALC_NRH: int8 :=0; -- # of high half SR reloads in next line
SUM_TAP_ELL: int12:=0; -- sum of TAP and ELL
SUM_TE_V(12): logic; -- SUM_TAP_ELL as a logic vector
SUM_TE_A: logic; -- sum of TAP and ELL, carry out bit
SUM_TE_B: logic; -- sum of TAP and ELL, highest bit
CALC_ELL_SFT: int8; -- ELL divided by Shift Reg Length
-- reload control
SMR_high: logic:=’0’; -- ’1’ = next split rel. of high half SR
HC_MLR: int16:=0; -- HCOUNT value at point of midline reload
HC_MLR5: int16:=0; -- HCOUNT value at start of early ml reload
HC_MEN5: logic:=’0’; -- ’1’=enable HC_MLR5
-- refresh control
REFCNT: int11:=0x7FF; -- refresh rate counter
-- arbitration control
SMR_request: logic:=’0’; -- ’1’ = request split reload
SMR_ack: logic:=’0’; -- ’1’=acknowledge, perform split midl. rel.
REF_RQNR: int4:=0; -- number of refresh cycles desired
REF_PFNR: int4:=0; -- number of refresh cycles performed
-- n. of r.c. lagging: (REF_RQNR-REF_PFNR)
REF_ack: logic:=’0’; -- ’1’=acknowledge, perform refresh cycle
ARB_busy: logic; -- ’1’=reload or refresh unit busy
Abbildung 59: Variablen im Diagramm VIDEO/RELOAD