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ADC12J1600 Datasheet(PDF) 53 Page - Texas Instruments |
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ADC12J1600 Datasheet(HTML) 53 Page - Texas Instruments |
53 / 98 page ![]() ADC12J1600, ADC12J2700 www.ti.com SLAS969C – JANUARY 2014 – REVISED JULY 2015 7.4.5.3 PRBS Test Modes The PRBS test modes bypass the 8B10B encoder. These test modes produce pseudo-random bit streams that comply with the ITU-T O.150 specification. These bit streams are used with lab test equipment that can self- synchronize to the bit pattern and therefore the initial phase of the pattern is not defined. The sequences are defined by a recursive equation. For example, the PRBS7 sequence is defined as shown in Equation 9. y[n] = y[n – 6] y[n – 7] where • Bit n is the XOR of bit [n – 6] and bit [n – 7] which are previously transmitted bits (9) Table 35. PBRS Mode Equations PRBS TEST MODE SEQUENCE SEQUENCE LENGTH (bits) PRBS7 y[n] = y[n – 6]y[n – 7] 127 PRBS15 y[n] = y[n – 14]y[n – 15] 32767 PRBS23 y[n] = y[n – 18]y[n – 23] 8388607 The initial phase of the pattern is unique for each lane. 7.4.5.4 Ramp Test Mode In the ramp test mode, the JESD204B link layer operates normally, but the transport layer is disabled and the input from the formatter is ignored. After the ILA sequence, each lane transmits an identical octet stream that increments from 0x00 to 0xFF and repeats. 7.4.5.5 Short and Long-Transport Test Mode The short-transport test mode is available when the device is operated in DDC bypass mode (decimation = 1). The short transport pattern has a length of one frame. Table 36 lists the formula followed by each sample of the pattern. Table 36. Short Transport Test Pattern Definition BIT 11 10 9 8 7 6 5 4 3 2 1 0 ~LID LID SID+1 LID is the lane ID (0 to 7) and SID is the sample number within the frame (0 to 4). The entire pattern has a length of one frame and is listed in Table 37. Table 37. Short Transport Test Pattern LANE (CONVERTER ID) SAMPLE NUMBER (SID) 0 1 2 3 4 0 0xF01 0xF02 0xF03 0xF04 0xF05 1 0xE11 0xE12 0xE13 0xE14 0xE15 2 0xD21 0xD22 0xD23 0xD24 0xD25 3 0xC31 0xC32 0xC33 0xC34 0xC35 4 0xB41 0xB42 0xB43 0xB44 0xB45 5 0xA51 0xA52 0xA53 0xA54 0xA55 6 0x961 0x962 0x963 0x964 0x965 7 0x871 0x872 0x873 0x874 0x875 Copyright © 2014–2015, Texas Instruments Incorporated Submit Documentation Feedback 53 Product Folder Links: ADC12J1600 ADC12J2700 |
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