GMZAN3 Datasheet, PDF (19/53 Pages) List of Unclassifed Manufacturers – XGA ALALOG INTERFACE LCD MONITOR CONTROLLER

gmZAN3 Preliminary Data Sheet
4 Functional Description
A functional block diagram is illustrated below. Each of the functional units shown is described in the
following sections.
Host I/F
GPIO
Crystal
Reference
Analog
RGB
HS, VS
Reset
Circuit
Host
Interface
Clock
Generation
OSD
Controller
OSD
RAMs
Energy
Spectrum
Manager
Triple
ADC
& PLL
Test
Pattern
Generator
Image
Capture /
Measure-
ment
Zoom /
Shrink /
Filter
Gamma
Control
Output
Data
Path
LVDS
Transmitter
24/36/48-bit
TTL Output
gmZAN3L
Single Channel
LVDS Panel Data
and Control
gmZAN3T
TTL output to LCD
Panel
Figure 4.
gmZAN3 Functional Block Diagram
4.1 Clock Generation
The gmZAN3 features two clock inputs. All additional clocks are internal clocks derived from one or
more of these:
1. Crystal Input Clock (TCLK and XTAL). This is the input pair to an internal crystal oscillator and
corresponding logic. A 14.318 MHz crystal is recommended. Other crystal frequencies may be used,
but require custom programming. This is illustrated in Figure 5 below. This option is selected by
connecting a 10KΩ pull-up to HDATA2/AD2/OSC_SEL. Alternatively a single-ended TTL/CMOS
clock oscillator can be driven into the TCLK pin (leave XTAL and HDATA2/AD2/OSC_SEL as N/C
in this case). This is illustrated in Figure 8 below. See also Table 14.
2. Host Interface Transfer Clock (HCLK). For 2 or 6-wire Host Interface Port only. Not for muxed A/D.
The gmZAN3 TCLK oscillator circuitry is a custom designed circuit to support the use of an external
oscillator or a crystal resonator to generate a reference frequency source for the gmZAN3 device.
4.1.1 Using the Internal Oscillator with External Crystal
The first option for providing a clock reference is to use the internal oscillator with an external crystal.
The oscillator circuit is designed to provide a very low jitter and very low harmonic clock to the internal
circuitry of the gmZAN3. An Automatic Gain Control (AGC) is used to insure startup and operation over
C0523-DAT-01G
19
Genesis Microchip Confidential
http://www.genesis-microchip.com
July 2003