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HMP8112EVAL2 Datasheet(PDF) 9 Page - Harris Corporation |
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HMP8112EVAL2 Datasheet(HTML) 9 Page - Harris Corporation |
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9 / 40 page  4-9 exceed 285. Greater than 285 lines in a field is interpreted as a PAL video source. An ideal NTSC source should have 262.5 lines per field and a PAL source should have 312.5 lines per field. The HMP8112A can detect a STANDARD ERROR that sig- nals when the video received does not match the standard that was programmed into the Video Input Control Register. This flag, when asserted, tells the user that the video stan- dard that was expected was not found and a different stan- dard should be selected in the Video Input Control register. The error flag is cleared after a RESET or after the Chroma PLL Clock Ratio register has been loaded via the I2C bus. After the flag is cleared the standard error logic verifies the video standard. The error flag is set after 2 vertical sync peri- ods have passed and the line count did not match the expected line count. Video Adjustments The HMP8112A allows the user to vary such video parame- ters as Contrast, Brightness, Sharpness, Hue and Color Sat- uration. These adjustments can be made via the I2C interface. Contrast, brightness and sharpness are luminance controls. The full dynamic range of the luminance channel can be used by selecting the IRE setup cancellation mode. This mode will remove the IRE setup and blanking level off- set to take advantage of the full dynamic range of the lumi- nance processing path. The sharpening filters allow the enhancement of low, mid and high frequency components of the luminance signal to compensate for low amplitude video. Vertical sharpness is also controlled via the I2C interface. Hue and Color saturation controls enhance the CbCr compo- nents of the incoming video, all under user control. Luminance Adjustments The Luminance data can be adjusted in the HMP8112A. The user can adjust brightness and contrast of the Y or lumi- nance data. The user can also set the IRE or setup subtrac- tion value to eliminate the black pedestal offset from NTSC signals. The Contrast adjustment range can exceed a value of one so as to take full advantage of the 8-bit dynamic range for Y. The user control settings executes the equation YOUT = (Y - IRE Setup + BRIGHTNESS) x CONTRAST Brightness The user can control the brightness of the incoming video by programming the Brightness register. The brightness adjust- ment will offset the Y component. The brightness register is an 8-bit register where the bottom 7 bits are brightness con- trol and the top bit enables NTSC 7.5 IRE black setup can- cellation. When the IRE bit is set (1) for NTSC, then 73 is subtracted from the Y data. If the IRE bit is cleared (0) for PAL, then 64 is subtracted. The brightness control bits BR[6-0] will brighten the picture as the value is increased. BR = -64 is the darkest and BR = +63 is the brightest. The default value of the register after a RESET is 0 (80H). Contrast The contrast adjustment will allow the user to increase and decrease the gain of the Y data. The contrast factor is an 8- bit number (as shown below) that ranges from 0 to 1.992. X.XXXXXXX The default register value of 1.4766 (0xBD) is calculated as follows: Register = Factor * 128 = 1.4766 * 128 = 189 = 0xBD TABLE 1. COMPATIBLE VIDEO INPUT STANDARDS STANDARD COLOR SUBCARRIER fSC 27MHz PLL Ratio 24.54MHz PLL Ratio FIELDS/ SECOND VERTICAL LINES LINE FREQUENCY NOMINAL BANDWIDTH BLACK SETUP TO BLANK NTSC (M) 3.579545MHz 0x87C1 0x955D 60Hz 525 15,734 ( ± 0.0003%) 4.2MHz 7.5 IRE PAL (B, D, G, H, I) 4.43361875MHz 0xA826 0xB901 50Hz 625 15,625 ( ± 0.02%) 5.0MHz 0 IRE PAL (M) 3.57561149MHz 0x879B 0x9533 60Hz 525 15,750 ( ± 0.0003%) 4.2MHz 7.5 IRE PAL (N) 4.43361875MHz 0xA826 0xB901 50Hz 625 15,625 ( ± 0.15%) 4.2MHz 7.5 IRE PAL Special Combination N 3.58205625MHz 0x97DA 0x9578 50Hz 625 15,750 ( ± 0.15%) 4.2MHz 7.5 IRE IRE BLACK SETUP + + - X BRIGHTNESS CONTRAST Y DATA FROM DECODER Y’ 8 FIGURE 10. LUMINANCE CONTROL SETTINGS PATH (0 TO 1.999) (NTSC = 73, PAL = 64) (-64 TO +63) HMP8112A |
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