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CAST C6845 Megafunction Datasheet
• Medical instrumentation
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Test & Measurement Instrumentation
Industrial Equipment
Avionics
Gaming & Amusement Machines
Block Diagram
RWN
Address Register
And Decoder
CSN
RS
E
PDBTRI
DIN[7:0]
Horizontal
Total Reg
R0
Horizontal
Displayed Reg
R1
Horizontal Sync
Width Reg
R3
Vertical
Total Reg
R4
Vertical Total
Adjust Reg
R5
Vertical
Displayed Reg
R6
Vertical Sync
Position Reg
R7
Interlace Mode
Reg
R8
Max Scan Line
Address Reg
R9
Cursor Start
Reg
R10
Cursor End
Reg
R11
Start Address
Reg
R12
R13
Cursor Address
Reg
R14
R15
Sync Position
Reg
R2
Light Pen Reg
R16
R17
Linear
Address
Generator
Cursor
Control
CO
MA(13:0)
Light Pen Sync
LPSTB
CLK
Vertical
Control
RA(4:0)
CO
CO
CO
Scan
Line
Counter
Character
Row
Counter
CO
VS
CO
Horizontal
Sync Width
Counter
CO
CO
CO
Horizontal
Counter
Cursor
Set Reset
Register
HS
CO
Set Reset
Register
CLK
CLK
DE
RESETN
RESETN
DOUT[7:0]
PU_RESETn
Functional Description
This section describes the Block Diagram above. A description of each of the blocks in the diagram is given
here.
CAST, Inc.
Page 3
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