GM5020 Datasheet, PDF (72/86 Pages) List of Unclassifed Manufacturers – Graphics Processing IC providing high-quality images for LCD monitors and other pixelated displays

Genesis Microchip
gm5020 / gm5020-H Data Sheet
4.18 Host Interface
The purpose of the host interface is to connect to the external system microcontroller (MCU).
The gm5020’s host microcontroller interface has two modes of operation: 2-Wire compatible
mode, and a 6-wire (nibble wide) interface mode, which are selected by bootstrapping options.
Analog
RGB
Triple
ADC
Clock
Recovery
Digital
DVI
DVI
Rx
Digital YUV
Video
ITU656
(8-bits) Decoder
HDCP
Serial
Interface
SDRAM
Interface
Image
Capture
Host
Interface
Micro-
processor
(MCU)
Frame
Store
Interface
YUV
RealColor
Controls
RGB
Color
Controls
Input
Color
LUT
Frame Rate
Conversion
Image
Measurement
OSD
Zoom/
Shrink
Scaling
Gamma
Correction
LUT
Panel
Display Timing Interface
& Control
(24/48-bits)
Display
Clock
Generation
.
Figure 52. Host Interface Block
4.18.1 2-wire Configuration
The 2-wire compatible connection consists of a serial clock (SCL) and bi-directional serial data
line (SDA). The bus master drives the SCL clock and either the master or slave may drive the
SDA line (open drain). The gm5020 operates as a slave on the interface and the external MCU as
the master. The SDA and SCL lines are shared with the 6-wire communication lines HFSn and
HCLK respectively, as illustrated below.
gm5020
Host Interface
2-Wire
Interface
SDA SCL
Figure 53. 2-Wire External Interface
6-Wire
Interface
HCLK
HFSn
February 2002
63
C5020-DAT-01Q