FS450 ETC2 [List of Unclassifed Manufacturers], FS450 Datasheet - Page 6

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

FS450, FS451
2.2 Serial Control Port
FS450 setup is programmed by registers that are accessible via the I
Status and Revision ID can also be read from the registers.
‡
to Philips I
2.3 Sync Control
The FS450 operates in a slave mode, pseudo-master mode or full master mode. In pseudo-master mode,
the GCC graphic controller derives the VGA pixel clock, horizontal sync, and vertical sync from
VGA_CLKOUT supplied by the FS450. The syncs are used inside the FS450 to capture the computer video
and are regenerated to supply to external devices such as genlocked video from a DVD player or tuner. In
full master mode, the FS450 supplies to the GCC horizontal and vertical sync in addition to the VGA pixel
clock.
2.4 Input and Output Frame Formats
The FS450 does not contain a frame memory. Therefore, the FS450 output frame rate must be
synchronous to the input frame rate. To accomplish this, the active video portion in the output stream must
overlay the corresponding active video time in the input stream. Several registers on the FS450 control this
timing as illustrated in the following figures:
VGA_VSYNC
IVO
C
D
IVO + IVW
The output frame timing is determined by the CCIR601 and 656 specifications. Input parameters IHO, IVO,
and IHW must be set correctly so that when the image is scaled to the 656 output frame, the timing
requirements are met. Parameters A, B, C, and D are determined by the amount of underscan the user
wants on the target television screen.
JUNE, 2000, VERSION 1.2
Note: I
IHO = OHO / Hscale
IHW = OHW / Hscale
2
C is a registered trademark of Philips Corporation. The FS450 SIO bus is similar but not identical
2
C bus.
VGA_HSYNC
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IHO
Figure 3: GCC Frame Format
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A
Active Video
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IVO = OVO / Vscale
IVW = OVW / Vscale
COPYRIGHT
2
C
‡
B
1999, 2000 FOCUS ENHANCEMENTS, INC.
compatible serial port (SIO).
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PRELIMINARY PRODUCT DESCRIPTION
PRELIMINARY INFORM ATION
IHO + IHW
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