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SAA7115 Datasheet(PDF) 71 Page - NXP Semiconductors |
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SAA7115 Datasheet(HTML) 71 Page - NXP Semiconductors |
71 / 214 page Confidential - NDA required page 71 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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