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SAA7115 Datasheet(PDF) 71 Page - NXP Semiconductors

Part # SAA7115
Description  PAL/NTSC/SECAM Video Decoder with Adaptive PAL/NTSC Comb Filter, High Performance Scaler, I2C Sliced Data Readback and SQ PIXEL OUTPUT
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

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Filename:
SAA7115_Datasheet.fm
Last edited by H. Lambers
Philips Semiconductors
CVIP2
Date:
10/23/01
CS-PD Hamburg
Datasheet
SAA7115
Version:
0.67
8.5.1
SCALER OUTPUT FORMATTER (SUBADDRESSES 93H AND C3H)
The output formatter organizes the packing into the output FIFO. The following formats are available: Y-CB-CR 4:2:2,
Y-CB-CR 4:1:1, Y-CB-CR 4:2:0, Y-CB-CR 4:1:0, 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, 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 23.
Table 21 Byte stream for different output formats
Table 22 Explanation to Table 21
Table 23 Limiting range on I-port
8.5.2
VIDEO FIFO (SUBADDRESS 86H)
The video FIFO at the scaler output contains 32 Dwords. That corresponds to 64 pixels in 16-bit Y-CB-CR 4:2:2 format.
But as the entire scaler can act as a pipeline buffer, the actual available buffer capacity for the image port is much higher,
and can exceed beyond a video line.
The video FIFO provides 4 internal flags, reporting to what extent the FIFO is actually filled.
These are:
• The FIFO Almost Empty (FAE) flag
• The FIFO Combined Flag (FCF) or FIFO filled, which is set at almost full level and reset, with hysteresis, only after the
level crosses below the almost empty mark
• The FIFO Almost Full (FAF) flag
• The FIFO Overflow (FOVL) flag.
OUTPUT FORMAT
BYTE SEQUENCE FOR 8-BIT OUTPUT MODES
Y-CB-CR 4 : 2 : 2
CB0
Y0
CR0
Y1
CB2
Y2
CR2
Y3
CB4
Y4
CR4
Y5
CB6
Y6
Y-CB-CR 4 : 1 : 1
CB0
Y0
CR0
Y1
CB4
Y2
CR4
Y3
Y4
Y5
Y6
Y7
CB8
Y8
Y only
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Y8
Y9
Y10
Y11
Y12
Y13
NAME
EXPLANATION
CBn
CB (B
− Y) colour difference component, pixel number n = 0, 2, 4 to 718
Yn
Y (luminance) component, pixel number n = 0, 1, 2, 3 to 719
CRn
CR (R
− Y) colour difference component, pixel number n = 0, 2, 4 to 718
LIMIT STEP
ILLV[85H[5]]
VALID RANGE
SUPPRESSED CODES (HEXADECIMAL VALUE)
DECIMAL VALUE
HEXADECIMAL VALUE
LOWER RANGE
UPPER RANGE
0
1 to 254
01 to FE
00
FF
1
8 to 247
08 to F7
00 to 07
F8 to FF


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