C6845 Datasheet, PDF (3/6 Pages) List of Unclassifed Manufacturers – CRT Controller Megafunction

CAST C6845 Megafunction Datasheet
• ^{Medical instrumentation}
• ^{Test & Measurement Instrumentation}
• ^{Industrial Equipment}
• ^Avionics
• ^{Gaming & Amusement Machines}
Block Diagram
CLK
RESETN
DE
HS
Horizontal
Counter
Set Reset
Register
Horizontal
Sync Width
Counter
CLK
Character
RESETN Row
Counter
Vertical
VS
Control
Set Reset
Register
PU_RESETn
CO
CO
CO
CO
CO
CO
CO
CO
Cursor
Scan
Line
Counter
Linear
Address
Generator
CO
Cursor
Control
Light Pen Sync
CO
RA(4:0)
MA(13:0)
LPSTB CLK
Address Register
And Decoder
R0 ^Horizontal
Total Reg
R1 ^Horizontal
Displayed Reg
R2 ^{Sync Position}
Reg
R3 ^{Horizontal Sync}
Width Reg
Vertical
R4
Total Reg
R5 ^{Vertical Total}
Adjust Reg
Vertical
R6
Displayed Reg
R7 ^{Vertical Sync}
Position Reg
R8 ^{Interlace Mode}
Reg
R9 ^{Max Scan Line}
Address Reg
R10 ^{Cursor Start}
Reg
R11 ^{Cursor End}
Reg
R12 Start Address
R13 _Reg
R14 Cursor Address
R15 _Reg
R16 _{Light Pen Reg}
R17
RWN
CSN
RS
E
PDBTRI
DIN[7:0]
DOUT[7:0]
Functional Description
This section describes the Block Diagram above. A description of each of the blocks in the diagram is given
here.
CAST, Inc.
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