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TVB1440 Datasheet(PDF) 16 Page - Texas Instruments |
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TVB1440 Datasheet(HTML) 16 Page - Texas Instruments |
16 / 30 page Frequency (GHz) 0 1 2 3 4 5 6 7 8 9 10 -35 -30 -25 -20 -15 -10 -5 0 m1 m2 I2C_BUS1 I2C Switch (TCA9546A) TVB1440 I2C Address 0x58/59 SOC TVB1440 I2C Address 0x5C/5D TVB1440 I2C Address 0x58/59 TVB1440 I2C Address 0x5C/5D TVB1440 I2C Address 0x58/59 TVB1440 I2C Address 0x5C/5D I2C_BUS2 I2C_BUS3 SCL SDA TCA9546A I2C address options: 7'b1110XYZ where X = A2, Y= A1, Z = A0 TVB1440 I2C Address 0x58/59 TVB1440 I2C Address 0x5C/5D I2C_BUS4 ECCN: 3E991 TVB1440 SLASE51A – NOVEMBER 2014 – REVISED NOVEMBER 2014 www.ti.com 9.1.1.2.4 TVB1440 Configuration The TVB1440 must be configured by the SOC using I2C. Because of the limited number of I2C address available on the TVB1440, an I2C switch needs to be incorporated in order to configure each of the TVB1440. Figure 11 shows an example implement using the Texas Instruments TCA9546A 4-channel I2C switch. Figure 11. Example I2C Switch Implementation 9.1.1.2.5 Receiver Equalization Setting The TVB1440 has a receiver equalizer that is adjustable from 0dB to 15 dB at 5 Gbps. The common approach to determine the proper equalizer setting is to measure the insertion loss of the channel at the input of the TVB1440 at the Nyquist frequency of the data rate (1.875 GHz for 3.75 Gbps and 2.5 GHz for 5 Gbps). For example, if the input channel is 20 inches of trace with 4 mil width over FR4, the insertion loss at 3.75 Gbps would be -7.3 dB and at 5 Gbps would be -9.1 dB. The register EQ_LEVEL_LANEx, where X = 0, 1, 2, or 3 should be programmed to 3’b100 for a 3.75 Gbps data rate and should be programmed to 3’b101. The actual setting may need to be adjusted based on the additional channel parasitics from package, vias, and connectors. m1 frequency = 1.876 GHz IL = –7.346 m2 frequency = 2.500 GHz IL = –9.185 Figure 12. Insertion Loss of 20 Inch FR4 Trace With 4-mil Width 16 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Product Folder Links: TVB1440 |
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