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4LS10K 数据表(PDF) 34 Page - OSRAM GmbH |
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4LS10K 数据表(HTML) 34 Page - OSRAM GmbH |
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34 / 115 page ![]() Document Feedback 4LS Functional Description Datasheet • PUBLIC DS000542 • v3-01 • 2022-Nov-17 114 │ 33 7.9 Training Sequence / Pattern The use of a Training Sequence/Pattern is implemented on the sensor so that the FPGA can synchronize the receiver for the optimal centered clock edge. The period of each bit is given by the PLL Clock Period, as shown in Figure 42, for the respective MCLK values. The Training Sequence (TS) is defined by the use of three registers. The tables below gives a representation of the three registers combined together to form the training sequence. Figure 44: Transmission of Training Sequence with 8-Bit Resolution Word TSA TSB Bit 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 Register Training Sequence 1 Training Sequence 3 Training Sequence 2 Training Sequence 3 Register Bits 5 4 3 2 1 0 7 6 5 4 3 2 1 0 3 2 Figure 45: Transmission of Training Sequence with 12-Bit Resolution Word TSA TSB Bit 11 10 … 5 4 3 2 1 0 11 10 … 5 4 3 2 1 0 Register Training Sequence 1 Training Sequence 3 Training Sequence 2 Training Sequence 3 Register Bits 7 6 … 1 0 7 6 5 4 7 6 … 1 0 3 2 1 0 Figure 46 presents the transmission for the training pattern over the time, in relation to the LVAL signal. As soon as the sensor is powered (respecting power-on-sequence), starts transmitting the Training Sequence. The TS is always transmitted before the Valid Training Sequence (VTS) and when the FPGA no longer requests for readout. The VTS has the same value as TS but is comprehended between the falling edge of START_READOUT and following LVAL rising edge signals, as represented on Figure 52 and Figure 53. Figure 46: Training Pattern Transmission Pending on the transmission mode (12-bit or 8-bit at 4-To-1, 2-To-1 or 1-To-1), the VTS number of words or clocks (each clock is equal to TMCLK) varies, as shown below. Please note that Word B is always the first word after the START_READOUT falling edge. Start_Readout LVAL Data VTS TS Line Data VTS TS Line Data TS VTS Line Data TS |
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