1440p
NTSC and related formats (480p) can be scaled to all the
output resolutions listed. All 1080p modes use CEA standard
timings for maximum compatibility.
Three scaling options are o
ff
ered:
(1) FILL uses a polyphase scaler to produce sharp, artifact
free interpolation to use all of the vertical height.
(2) OVER scales 240p content by a factor of 5 vertically,
cutting o
ff
the top and bottom of the image, much like a
CRT.
(3) UNDER uses a scaling factor of 4 vertically to produce a
sharp, integer scaled image with black bars on the top and
bottom.
If you do not see an image or receive an error on your display,
press the ‘Option Button’ to keep cycling until you arrive at an
acceptable mode.
The 240p output can only be enabled by the downscale mode
(see section below).
720p
768p
480p
240p
H. Sampling
Generic 4:3
The RT5X uses a combination of its flexible video ADC plus
polyphase scaler to produce various horizontal sampling
options.
The Generic 4:3 and 16:9 modes interpolate the horizontal
directions to produce the correct aspect ratio at the select
output resolution.
The optimal modes, listed for the various consoles, sample the
horizontal direction at the same rate as the original console.
The FPGA is capable of automatically interpolating and
selecting the best phase for sharp, pixel-perfect output under
most circumstances.
Note: some modes only support 4:3 and 16:9 sampling due to
horizontal resolution limitations.
Generic 16:9
SNES/PCE/PS1
256
Gen/PS1/Sat 320
N64 320
NEOGEO 320
Saturn 352
PS1 384
Interpolation
Sharp
The RT5X also utilizes an advanced polyphase scaler for the
vertical direction.
Sharp utilizes a Bilinear Sharp kernel, which is best suited for
2D graphics and can produce high quality results even for
non-integer scaling factors.
Soft utilizes a standard Bilinear kernel and may look better for
3D games where Sharp results in too much aliasing.
Soft
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