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CX25870 Datasheet(PDF) 93 Page - Synaptics Incorporated. |
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CX25870 Datasheet(HTML) 93 Page - Synaptics Incorporated. |
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93 / 291 page  CX25870/871 1.0 Functional Description Flicker-Free Video Encoder with Ultrascale Technology 1.3 Device Description 100381B Conexant 1-77 NOTE: No change to the incoming or outgoing HSYNC* and VSYNC* signal frequencies are necessary for SCART generation. The sync rates should continue to match those found with PAL-BDGHI transmission. While the CX25870/871 is in SCART outmode, the composite video output (Video[3]) contains a standard bilevel analog sync along with all other components that comprise a standard PAL-BDGHI video signal. The sync pulse has an amplitude of 0 mV to 300 mV peak-to-peak and a duration of 4.70 µs by default. The amplitude can only be adjusted through the use of external passives, but its width can be adjusted through serial writing of the CX25870 HSYNC_WIDTH register. The CX25870’s Composite should be used by the subsystem to provide the positive-going Video output/sync output expected by SCART-compliant display devices. In other words, the PAL Composite output should be fed into the Video Input (Contact #20-CEI IEC 933-1) on the SCART connector. CVBS will possess the same bandwidth and time delays as the CX25870 RGB primary color signals. The inclusion of a full composite video signal as the 4th output exceeds the SCART capabilities of some non-Conexant Flicker Filter encoders which choose to output only Composite Sync as the 4th output. This implementation benefits the customer because some European Set-Top Boxes connect to TVs solely through the SCART connector. If the TV only receives Composite video via the SCART connector, and the Set Top Box is set to RGB output with sync for blanking (not CVBS) on pin 20, a picture will not be present at all on the TV. However, with the CX25870, if the TV only receives CVBS (not RGB) and the Set Top Box is set to RGB output with CVBS on pin 20 the customer will get a colorful picture on his TV. Table 1-24. Serial Writes Required to Switch CX25870/871 into SCART Output Operation Bit Name Location Value Comment EN_SCART Bit 3–Register 0x6C 1 Enables SCART Output mode. DACs will transmit Video[0-3] as SCART compatible RGB/CVBS outputs. By default, in SCART Output mode, the CX25870 will transmit: DAC_A = Video[0] = Red DAC_B = Video[1] = Green DAC_C = Video[2] = Blue DAC_D = Video[3] = PAL Composite (CVBS) OUT_MUXD[1:0] OUT_MUXC[1:0] OUT_MUXB[1:0] OUT_MUXA[1:0] Bits 7:0–Register CE E4 By configuring the DAC routing register, the CX25870 will now transmit: DAC_A = Video[0] = 00 = Red DAC_B = Video[1] = 01 = Green DAC_C = Video[2] = 10 = Blue DAC_D = Video[3] = 11 = PAL Composite (CVBS) OUT_MODE[1:0] Bits 3:2–Register D6 11 Forces CX25870 to generate SCART output mode. |
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