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C6845

Cast
Part Number C6845
Manufacturer Cast
Description CRT Controller Megafunction
Published Nov 7, 2008
Detailed Description C6845 CRT Controller Megafunction General Description The C6845 Cathode Ray Tube Controller (CRTC) interfaces a micropro...
Datasheet PDF File C6845 PDF File

C6845
C6845

Overview
C6845 CRT Controller Megafunction General Description The C6845 Cathode Ray Tube Controller (CRTC) interfaces a microprocessor to a raster-scan CRT display.
The C6845 is a synchronous, synthesizable VHDL megafunction, functionally equivalent to the Motorola www.
DataSheet4U.
com MC6845 CRT Controller.
The microprocessor access 19 registers (1 Address and 18 Data Registers) within the C6845 in order to provide video timing, refresh memory addresses, cursor, and light pen strobe signals.
CRT video timing signals include Vertical Sync (VS), Horizontal Sync (HS), and Display Enable (DE) output signals.
Refresh memory addressing includes Memory Address (MA[13:0]) and Row Address (RA[4:0]) output buses.
The C6845 microprocessor interface consist of unidirectional data input (DIN[7:0]) and data output (DOUT[7:0]) buses and control signals RS, RWn, CSn, and E.
Optionally, an available bus wrapper converts the unidirectional data buses into an 8-bit bi-directional data bus (D[7:0]).
This is the pin equivalent to the MC6845.
Features • • • • • • • • • • • • • Fully-synchronous, synthesizable VHDL Megafunction, functionally equivalent to Motorola MC6845 Capable of driving alphanumeric, semi-graphic, or bit-mapped graphics displays Wide range of programmable alphanumeric screen formats Programmable registers controlling output signals Vertical Sync (VS), Horizontal Sync (HS), and Display Enable (DE) signals Programmable horizontal line rate and sync pulse width Programmable vertical frame rate Programmable registers controlling Memory Address (MA[13:0]) start address Programmable Start Address Register for Hardware Scrolling Programmable registers controlling Row Address (RA[4:0]) size, yielding a character row Programmable register controlling Normal Sync (Non-Interlace), Interlace Sync, or Interlace Sync & Video Mode Programmable registers for control and format of Cursor Light Pen Register Microprocessor 8-bit Data Bus and Control Interface CAST, Inc.
March 2004 Page 1 CA...


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