FS401LF datasheet(84/104 Pages) ETC2

84 / 104 page

FS401, FS403

PRODUCT SPECIFICATION

REV. NO. 1.7

JANUARY 24, 2007

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Multiplexing alternatives on OSC2 must be done with an external multiplexer (perhaps controlled

by a GPO bit)

5.3.2 Horizontal Scaler

The Frame Store Controller passes pixels extracted from the external frame store memory to the

Horizontal Scaler.

Programming the HSC register sets horizontal scale factor. HSC is the Horizontal Scaling Coefficient, m

that determines the horizontal scaling factor:

HSF = (1 + m/128)

With a range: 0

≤ m ≤ 384; 1 ≤ HSF ≤ 1 + 384/128

5.3.3 Digital Video Encoder

For Composite Video and Y/C outputs, pixels from the Horizontal Scaler are routed to the Video Encoder.

NTSC (SMPTE 170M) and PAL (CCIR 624) standards are preprogrammed into the Video Encoder to

preset horizontal and vertical timing, subcarrier frequency, and chrominance phase.

Setting the Command Register OFMT1-0 bits to 00 selects Composite Video and Y/C outputs, setting it to

01 selects RGB and bypasses the encoder, and setting it to 10 or 11 selects component YUV directly.

Setting the Command Register TV_CLK1-0 selects the output clock mode per the table in the Command

Setting the Command Register PROG_INT bit switches the output mode from interlaced (0) to

progressive (1).

Setting the Command Register PAL_NTSC bit switches the output mode from NTSC (0) to PAL (1).

Command Register bit, CBP inserts a 18% (0.64 MHz for NTSC; 0.8 MHz for PAL) fSC bandpass filter

centered at fSC following the chroma modulator.

Command Register bit, LNTCH insert a luminance notch filter in the Y channel prior to the Composite

Video summer and the Y output.

The Brightness Coefficient (BRT) provides an offset adjustment in the Luma Encoder. BRT is a signed 8-

bit number.

The Contrast Coefficient (CON) provides a luma gain adjustment in the Luma Encoder. Contrast has an

implicit denominator of 32.

The Color Saturation Coefficient (CSC) provides a gain adjustment in the Chroma Encoder. Saturation

has an implicit denominator of 32.

5.3.4 YUV/RGB Matrix

For RGB outputs, pixels from the Horizontal Scaler are routed to the YUV/RGB matrix. Matrix coefficients

are programmed by setting the OFMT1-0 bits in the Command Register. For a YUV output, the OFMT1-0

bits can be set to bypass the YUV/RGB matrix.

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