ZR36057 ZORAN [Zoran Corporation], ZR36057 Datasheet - Page 26

• Manufacturer Part Number: ZR36057
• Description: ENHANCED PCI BUS MULTIMEDIA CONTROLLER
• Manufacturer: ZORAN [Zoran Corporation]

Enhanced PCI Bus Multimedia Controller
12.3 Video Front End, Scaler and Pixel Format
Register
This register contains the video front end configuration (byte 3),
video scaler (bytes 2-1) and pixel formatter (byte 0) parameters
Address Offset: 0x008
31:27
23:21
Bit
26
25
24
Type
RW
RW
RW
RW
R
Mod
vid
vid
vid
vid
Reserved. Returns zero.
ExtFI - External Field Indication.
‘1’ - the video source provides an FI signal.
‘0’ - field indication is derived from HSYNC
and VSYNC (default value).
TopField - Top Field Interpretation.
If field indication is derived from the FI input
signal (see ExtFI), then this parameter
defines which level of FI indicates the top
field:
‘1’ - FI high indicates the top field (default
value).
‘0’ - FI low indicates the top field.
If field indication is derived internally from
HSYNC and VSYNC, then this parameter
defines which level of HSYNC indicates the
top field on the active edge of VSYNC:
‘1’ - HSYNC high indicates the top field
(default value).
‘0’ - HSYNC low indicates the top field.
VCLKPol - Video Clock Polarity. When set to
‘0’ (default value), the video interface inputs
are sampled by the positive edge of VCLKx2
that is qualified by VCLK = ‘0’. The video
interface outputs (other than PXEN) are
driven at the negative edge of VCLKx2 which
is qualified by VCLK = ‘1’.
When set to ‘1’, the video interface inputs are
sampled by the positive edge of VCLKx2 that
is qualified by VCLK = ‘1’. The video interface
outputs (other than PXEN) are driven at the
negative edge of VCLKx2 which is qualified
by VCLK = ‘0’.
HFilter - Horizontal Filter Selection.
The following horizontal filters can be
selected:
000b - Filter 1 = no luminance, 3-tap
chrominance
001b - Filter 2 = 3-tap luminance, 3-tap
chrominance
010b - Filter 3 = 4-tap luminance, 4-tap
chrominance
011b - Filter 4 = 5-tap luminance, 4-tap
chrominance
100b - Filter 5 = 4-tap luminance, 4-tap
chrominance
101b - 111b will result in the default filter.
Default value 000b.
Description
26
Address Offset: 0x008 (Continued)
19:14
13:8
Bit
4:3
20
7
6
5
2
1
0
Type
RW
RW
RW
RW
RW
RW
RW
RW
R
R
Mod
vid
vid
vid
vid
vid
vid
vid
vid
DupFld - Duplicate Field.
This parameter has an effect on the vertical
decimation of a frame in respect to the video
source. The result is less loss of information
and less distortion.
‘1’ - indicates top and bottom fields are equal.
‘0’ - indicates an interlaced video source, top
and bottom fields are different (default value).
HorDcm - Horizontal Decimation Ratio.
This parameter defines the number of pixels
to be dropped out of every 64 consecutive
pixels.
000000b - no horizontal decimation (default
value).
VerDcm - Vertical Decimation Ratio.
This parameter defines the number of lines to
be dropped out of every 64 consecutive lines.
000000b - no vertical decimation (default
value).
Reserved. Returns zero.
DispMod - Display Mode.
‘1’ - single field.
‘0’ - emulated interlaced video (default value).
Reserved. Returns zero.
YUV2RGB - YUV to RGB Conversion. This
parameter defines the pixel output format:
00b - YUV 4:2:2,
01b - RGB 8,8,8,
10b - RGB 5,6,5 (default value),
11b - RGB 5,5,5.
ErrDif - Error Diffusion. This parameter has
an effect only on RGB 5,6,5 and 5,5,5 output
formats.
‘1’ - error diffusion is active
‘0’ - simple truncation of RGB 8,8,8 is
executed (default value).
Pack24 - 24 Bit Packed Format. This bit is
applicable only if YUV2RGB = 01b.
‘1’ - RGB 8,8,8 is packed such that it takes 3
PCI cycles to transfer 4 pixels.
‘0’ - one pixel per PCI cycle is transferred
(default value).
LittleEndian - Little Endian Format flag.
‘1’ - pixel layout on PCI is little endian (default
value).
‘0’ - pixel layout on PCI is gib endian.
Description