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UPD72020GC-8-3B6(1/3)
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C-MOS GRAPHIC DISPLAY CONTROLLER
-TOP VIEW39 38 37 36 35 34 33 32 31 30 29 28 27
IL08
NC
NC NC
V DD (+5V) V DD (+5V)
40 41 42 43 44 45 46 47 48 49 50 51 52
NC
GND GND
NC NC
NC NC
26 25 24 23 22 21 20 19 18 17 16 15 14
1 2 3 4 5 6 7 8 9 10 11 12 13
(V DD =+5V) PIN No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 I/O I/O O O I O O I/O O O O I/O I SIGNAL NC AD15/(LC2) A16/(LC3)/ AT.BLINK-CLC A17/(CSR-LC4)/ CSR-IMAGE V DD V DD IC 2xCCLK DBIN HSYNC-REF VSYNC/EX.SYNC BLANK NC NC RAS DRQ/A18/(A13)/ A16 DACK/A19/(A14)/ A17 RD PIN No. 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 I/O I I I/O I/O I/O I/O I/O I/O I/O I/O I I/O I/O SIGNAL WR A0 DB0 DB1 DB2 DB3 DB4 NC NC DB5 DB6 DB7 GND GND IC LPEN/WAIT/DT AD0 AD1 PIN No. 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O SIGNAL AD2 AD3 NC NC AD4 AD5 AD6 AD7 AD8 AD9 AD10 AD11 AD12 AD13(LC0) AD14(LC1) NC
IC;Internally Connected, (
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;When Character/Graphic mix mode
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UPD72020GC-8-3B6(2/3)
( 21 22 23 24 25 28 29 30 35 36 37 38 41 42 43 44 45 46 47 48 49 50 51 2 16 17 3 4
);When Character mode, ;When Character/Graphic mix mode
DB0 DB1 DB2 DB3 DB4 DB5 DB6 DB7
20 A0 18 RD 19 WR 34 LPEN/WAIT/DT
AD0 AD1 AD2 AD3 AD4 AD5 AD6 AD7 AD8 AD9 AD10 AD11 AD12 AD13(LC0) AD14(LC1) AD15(LC2)
INPUT 2xCCLK A0 LPEN/WAIT/DT RD WR OUTPUT AT.BLINK-CLC BLANK CSR-IMAGE (CSR-LC4) DBIN DRQ HSYNC-REF (LC0 to LC3) RAS INPUT/OUTPUT (A13),(A14), A16 , A17 , A18,A19 AD0 to AD15 DACK DB0 to DB7 VSYNC/EX-SYNC
;2xCARACTER CLOCK ;CPU ADDRESS BUS 0 ;LIGHT-PEN STROBE/DRAWING-WAIT/ DATA TRASFER ;CPU READ STROBE ;CPU WRITE STROBE
;ATTRIBUTE BLINK-CLEAR LINE COUNTER ;BLANKING SIGNAL ;CURSOR-IMAGE ;CURSOR-LINE COUNT 4 ;DATA BUS IN ;DMA REQUEST ;HORIZONTAL SYNC-REFRESH TIMING ;LINE COUNT 0 to 3 ;ROW ADDRESS STROBE
DRQ/A18/(A13)/ A16 DACK/A19/(A14)/ A17 A16/(LC3)/ AT.BLINK-CLC A17/(CSR-LC4)/ CSR-IMAGE
9 DBIN 10 HSYNC-REF 11 VSYNC/EX.SYNC 8 2xCCLK
;DISPLAY MEMORY ADDRESS ;DISPLAY MEMORY ADDRESS/ DATA BUS 0 to 15 ;DMA ACKNOWLEDGE ;CPU DATA BUS 0 to 7 ;VERTICAL SYNC(OUTPUT)/ EXTERNAL SYNC(INPUT)
UPD72020GC-8-3B6(3/3)
BLANK 12
VSYNC/ EX.SYNC 11
HSYNCREF 10
LPEN/ WAIT/ DT 34
A17/CSR-LC4/ CSR-IMAGE 4
A16/LC3/ AT.BLINK - CLC 3
AD15/ LC2 2
AD14/ LC1 51
AD13/ AD0LC0 AD12 50 35-38 41-49
RAS 15
DBIN 9
GDC-VIDEO MEMORY CONTROL
SYNC SIGNAL GENERATION BLOCK
DISPLAY ADDRESS CONTROL BLOCK
DRAWING ADDRESS CONTROL BLOCK
DUAL PORT MEMORY CONTROL C/R(7) 8 2xCCLK HBP(6) HS(5) HFP(6) VBP(6) VS(5) VFP(6) FC(6) BLINK(5) L/R(5) CFI(5) CST(5) ZR(4) SL(10) DAD(20) ZW(4) D2(14) DI(14) EAD(20) DM(14) DC(14) P(9) DIR(3) L/F(10) REF(8) D(14)
8 8 8 PIN EXTENSION CONTROL BI-DIRECTIONAL BUFFER
8 20 A0 18 RD 19 WR 16 DRQ/A18/A13/A16 17 DACK /A19/A14/A17 21-25 28-30 DB0-DB7 CPU INTERFACE DMA CONTROL BLOCK 9 9 INPUT/OUTPUT FIF0 16x9 COMMAND CONTROL ROM DATA RAM
VIDEO MEMORY DATA CONTROL BLOCK
dAD(16) PTN(16) WMK(16)
PS(16)
MOD(2)

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