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GS8000ACNE3 Scheda tecnica(PDF) 9 Page - Gennum Corporation |
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GS8000ACNE3 Scheda tecnica(HTML) 9 Page - Gennum Corporation |
9 / 16 page GS8000 Data Sheet Proprietary and Confidential 25544 - 3 May 2005 9 of 16 3. Detailed Description 3.1 Differential Inputs The GS8000 contains four current mode differential signal input buffers. These allow the device to be connected to a DVI 1.0 compliant data stream consisting of three transition minimized differential signals (TMDS) and a clock signal at one tenth the data rate. All input buffers have internal user programmable input termination pull-up resistors. A resistor value of 500 Ω should be connected between the EXT_RES pin and D_GND to set the input termination to 50 Ω. The input buffers use a separate power supply of +3.3V DC (VDD and GND) and have a wide common mode operating point. 3.2 LONG REACH™ DVI / HDMI 3.2.1 LONG REACH™ TMDS Gennum’s patented DVI technology restores the received signals to the input level defined in the DVI 1.0 and HDMI 1.1 specifications. Four gain stages are provided, three of which extend TMDS data at rates from 250Mb/s to 1.65Gb/s. The fourth gain stage is optimized to extend the clock signal at one tenth the received TMDS data rate. These stages operate under the assumption that the input signal was launched at an amplitude of between 800mV and 1200mV differential. 3.2.2 LONG REACH™ DDC The DDC Extend block manages DDC traffic in both directions by restoring incoming signals and boosting outgoing signals to meet the DDC specification. Connect the DDC_SDA and DDC_SCL pins to the DDC bus at the closest location to the GS8000. See Figure 3-2: LONG REACH™ DVI or HDMI Receive Solution. NOTE: If a level shifter is necessary, the GS8000 must be placed on the 5V side (connector side) as shown in Figure 3-2: LONG REACH™ DVI or HDMI Receive Solution. NOTE: The 5V present on the DVI and HDMI connectors can be significantly reduced over long ranges of cable. Therefore, it is recommended that this voltage not be used as the supply voltage for the LONG REACH™ DDC. |
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