saa7118 NXP Semiconductors, saa7118 Datasheet - Page 63

• Manufacturer Part Number: saa7118
• Description: Multistandard Video Decoder With Adaptive Comb Filter And Component Video Input
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 15219
Product data sheet
8.6.1 Scaler output formatter (subaddresses 93h and C3h)
8.6.2 Video FIFO (subaddress 86h)
The output formatter organizes the packing into the output FIFO. The following formats
are available: Y-C
Y only (e.g. for raw samples). The formatting is controlled by FSI[2:0] 93h[2:0], FOI[1:0]
93h[4:3] and FYSK[93h[5]].
The data formats are defined on Dwords, or multiples, and are similar to the video formats
as recommended for PCI multimedia applications (compares to SAA7146A), but planar
formats are not supported.
FSI[2:0] defines the horizontal packing of the data, FOI[1:0] defines how many Y only lines
are expected, before a Y/C line will be formatted. If FYSK is set to logic 0 preceding Y only
lines will be skipped, and the output will always start with a Y/C line.
Additionally the output formatter limits the amplitude range of the video data (controlled by
ILLV[85h[5]]); see
Table 16:
Table 17:
Table 18:
The video FIFO at the scaler output contains 32 Dwords. That corresponds to 64 pixels in
16-bit Y-C
actual available buffer capacity for the image port is much higher, and can exceed beyond
a video line.
The image port, and the video FIFO, can operate with the video source clock
(synchronous mode) or with an externally provided clock (asynchronous and burst mode),
as appropriate for the VGA controller or attached frame buffer.
The video FIFO provides 4 internal flags, reporting to what extent the FIFO is actually
filled.
Output format
Y-C
Y-C
Y only
Name
C
Yn
C
Limit step
ILLV[85h[5]]
0
1
B
R
n
n
B
B
-C
-C
R
R
4 : 2 : 2 C
4 : 1 : 1 C
B
Byte stream for different output formats
Explanation to
Limiting range on I port
-C
R
Valid range
Decimal value
1 to 254
8 to 247
4 : 2 : 2 format. But as the entire scaler can act as a pipeline buffer, the
Byte sequence for 8-bit output modes
Y0
Explanation
C
Y (luminance) component, pixel number n = 0, 1, 2, 3 to 719
C
B
Table
-C
B
B
B
R
0 Y0
0 Y0
(B
(R
Rev. 06 — 22 December 2005
R
Y1
4 : 2 : 2, Y-C
18.
Y) color difference component, pixel number n = 0, 2, 4 to 718
Y) color difference component, pixel number n = 0, 2, 4 to 718
Table 16
C
C
Y2
R
R
Hexadecimal value
01 to FE
08 to F7
0 Y1
0 Y1
Multistandard video decoder with adaptive comb filter
Y3
B
-C
C
C
Y4
R
B
B
4 : 1 : 1, Y-C
2 Y2
4 Y2
Y5
C
C
Y6
R
R
Suppressed codes (hexadecimal value)
Lower range
00
00 to 07
2 Y3
4 Y3
B
Y7
-C
R
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
4 : 2 : 0, Y-C
C
Y4
Y8
B
4 Y4
Y5
Y9
C
Y6
Y10 Y11 Y12 Y13
SAA7118
R
Upper range
FF
F8 to FF
B
4 Y5
-C
R
Y7
4 : 1 : 0 and
C
C
B
B
63 of 170
6 Y6
8 Y8