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ADC12DJ2700 Datasheet(PDF) 70 Page - Texas Instruments |
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ADC12DJ2700 Datasheet(HTML) 70 Page - Texas Instruments |
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70 / 146 page  ADC JESD204B TRANSPORT LAYER SCRAMBLER (Optional) JESD204B LINK LAYER JESD204B TX 8b/10b ENCODER ADC JESD204B Block Long/Short Transport Octet Ramp Test Mode Enable Repeated ILA Modified RPAT Test Mode Enable PRBS D21.5 K28.5 Serial Outputs High/Low Test Mode Enable Active Lanes and Serial Rates Set by JMODE 70 ADC12DJ2700 SLVSEH9 – JANUARY 2018 www.ti.com Product Folder Links: ADC12DJ2700 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated Figure 84. Test Mode Insertion Points 7.4.5.2 PRBS Test Modes The PRBS test modes bypass the 8b, 10b 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, Equation 10 defines the PRBS7 sequence. 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 (10) Table 39 lists equations and sequence lengths for the available PRBS test modes. The initial phase of the pattern is unique for each lane. Table 39. 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 7.4.5.3 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. 7.4.5.4 Short and Long Transport Test Mode JESD204B defines both short and long transport test modes to verify that the transport layers in the transmitter and receiver are operating correctly. The ADC12DJ2700 has three different transport layer test patterns depending on the N' value of the specified JMODE (see Table 19). |
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