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ISL34340_0806 Datasheet(PDF) 8 Page - Intersil Corporation |
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ISL34340_0806 Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 10 page 8 FN6255.1 June 23, 2008 Applications Overview A pair of ISL34340 SERDES transports 24-bit parallel video (16-bit parallel video for the ISL34320) along with auxiliary data over a single 100 Ω differential cable either to a display or from a camera. Auxiliary data is transferred in both directions and can be used for remote configuration and telemetry. The benefits include lower EMI, lower costs, greater reliability and space savings. The same device can be configured to be either a serializer or deserializer by setting one pin (VIDEO_TX), simplifying inventory. RGBA/B/C, VSYNC, HSYNC, and DATAEN pins are inputs in serializer mode and outputs in deserializer mode. The video data presented to the serializer on the parallel LVCMOS bus is serialized into a high-speed differential signal. This differential signal is converted back to parallel video at the remote end by the deserializer. The side-channel data is transferred between the SERDES pair during two lines of the vertical video blanking interval. When the side-channel is enabled, there will be a number of PCLK cycles uncertainty from frame-to-frame. This should not cause sync problems with most displays, as this occurs during the vertical front porch of the blanking period. When properly configured, the SERDES link supports end-to-end transport with fewer than one error in 1010 bits. Differential Signals and Termination The ISL34340 serializes the 24-bit parallel data at 30x the PCLK_IN frequency. The ISL34320 serializes the 16-bit parallel data at 20x the PCLK_IN frequency. The extra 2 bits per word come from the 8b/10b encoding scheme. The high bit rate of the differential serial data requires special care in the layout of traces on PCBs, in the choice and assembly of connectors, and in the cables themselves. PCB traces need to be adjacent and matched in length (so as to minimize the imbalanced coupling to other traces or elements), and of a geometry to match the impedance of the transmitter and receiver, to minimize reflections. Similar care needs to be applied to the choice of connectors and cables. SERIOP and SERION pins incorporate internal differential termination of the serial signal lines. External termination cannot be used unless the side-channel is disabled. SERIO Pin AC-Coupling AC-coupling minimizes the effects of DC common mode voltage difference and local power supply variations between two SERDES. The serializer outputs DC balanced 8b/10b line code, which allows AC-coupling. The AC-coupling capacitor on SERIO pins must be 27nF on the serializer board and 27nF on the deserializer board. The value of the AC-coupling capacitor is very critical since a value too small will attenuate the high speed signal at low clock rate. A value too big will slow down the turn around time for the side-channel. Receiver Reference Clock (REF_CLK) The reference clock (REF_CLK) for the PLL is fed into PCLK_IN pin. REF_CLK is used to recover the clock from the high speed serial stream. REF_CLK is very sensitive to any instability. The following conditions must be met at all times after power is applied to the deserializer, or else the deserializer may need a manual reset: • REF_CLK frequency must be within the limits specified • REF_CLK amplitude must be stable. A simple 3.3V CMOS crystal oscillator can be used for REF_CLK. Power Supply Sequencing The 3.3V supply must be higher than the 1.8V supply at all times, including during power-up and power-down. To meet FIGURE 3. PARALLEL VIDEO OUTPUT TIMING [HSYNCPOL = 0, VSYNCPOL = 0, PCLKPOL (reg) = 0] HSYNC VSYNC DATAEN PCLK_OUT RGB[A:C][7:0] 1/fOUT TODC TOR TDV TOF VALID DATA VALID DATA DATA HELD AT PREVIOUS VALUE VALID DATA TDV VIDEO_TX = 0 ISL34340 |
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Descripción similar - ISL34340_0806 |
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