Digital Blocks, Inc. 
Part Number : DB6845
Overview :
The Digital Blocks DB6845 CRT Controller core is a full function equivalent to the Motorola MC6845 device. The DB6845 interfaces a microprocessor to a raster-scan CRT display. The microprocessor access 19 registers (1 Address and 18 Data Registers) within the DB6845 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.
Features : - Synchronous, synthesizable VHDL Core, functionally equivalent to Motorola
- MC6845.
- Capable of driving alphanumeric, semi-graphic, or bit-mapped graphics displays.
- Wide range of programmable 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.
Categories :
Portability :
Type : Soft
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