FS450 ETC2 [List of Unclassifed Manufacturers], FS450 Datasheet - Page 5

• Manufacturer Part Number: FS450
• Description: i-Net TV Interface Video Processor
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

FS450, FS451
2. Architectural Overview
The FS450 i-Net TV Video Interface Processor provides NTSC or PAL TV out for Intel's 82810 Video Co-
processor and many other 3D graphic controller ("GCC") chips. It accepts digital RGB in, converts it to
CCIR 656 digital video, provides interfaces to external 656 digital DVD systems, windowing hardware, alpha
blenders, et al and outputs very high quality RGB, YUV, S-Video, or Composite Video. The chip consists of
the following major sections:
2.1 Oscillators and PLLs
The FS450 synthesizes a 27 to 85 MHz clock off of the 27 MHz Television clock and supplies this clock
(VGA_CKOUT) to the GCC. This clock is buffered and returned to the FS450 (VGA_CKIN) synchronous to
the RGB data and Sync information. This clock has a 1½ Hz resolution and must be adjusted so the GCC
scaled input data rate exactly matches the CCIR 656 data output rate.
The VG_CKOUT Phase Lock Loop (PLL) synthesizer uses Numerically Controlled Oscillator (NCO) to fine
adjust the 27MHz oscillator to a clock precisely matched to the digital RGB data coming from the GCC.
Additionally, the PLL itself can be controlled by programming the numerator (M) and denominator (N) of the
PLL itself. The combination of the PLL synthesizer and NCO are used to precisely match the input to the
output.
JUNE, 2000, VERSION 1.2
VSync
HSync
EGRN
Blank
ERED
EBLU
GRN
RED
BLU
Oscillators and PLLs
Serial Control Port
Sync Control
Input and Output Frame Formats
/12
/6
/3
HBlank In
VBlank In
Field In
CCIR
656
In
/24
Generator
/8
Timing
VGA
Decoder
H
27 MHz
Clock
Figure 2: FS450 Functional Block Diagram
/3
/24
/16
Cache
H
NCO
/24
RGB
YUV
to
5
Encoder
/16
Divider
RGB
YUV
to
V
COPYRIGHT
/30
/30
/16
o w
Color Space Converter & Scaler
Flicker Filter
Encoder
YUV to RGB Converter
Flicker
Filter
/10
/10
/10
Divider
1999,2000 FOCUS ENHANCEMENTS, INC.
PRELIMINARY PRODUCT DESCRIPTION
VCO
/32
DAC
DAC
DAC
FIFO
PRELIMINARY INFORM ATION
/32
BLU/CHRMA
RED/LUMA
GRN/CVBS
Generator
CCIR 656
Timing
Clock
H
VGA
CPU
/16
/2
/3
/8
HBlank Out
VBlank Out
Auxiliary
Field Out
HREF
VREF
CCIR
656
Out