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71M6534 Datasheet(PDF) 56 Page - Maxim Integrated Products |
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71M6534 Datasheet(HTML) 56 Page - Maxim Integrated Products |
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56 / 132 page  71M6533/G/H and 71M6534/H Data Sheet FDS_6533_6534_004 56 Rev 2 2.2 System Timing Summary Figure 19 summarizes the timing relationships between the input MUX states, the CE_BUSY signal and the two serial output streams. In this example, MUX_DIV[3:0] = 6 and FIR_LEN[1:0] = 1. The duration of each MUX frame is (M40MHZ/M26MHZ = 00, 10, or 11 assumed): • 1 + MUX_DIV[3:0] * 1, if FIR_LEN[1:0] = 0 (138 CE cycles), complete MUX frame = 7 CK32 cycles • 1 + MUX_DIV[3:0] * 2, if FIR_LEN[1:0] = 1 (288 CE cycles) , complete MUX frame = 13 CK32 cycles • 1 + MUX_DIV[3:0] * 3, if FIR_LEN[1:0] = 2 (384 CE cycles) , complete MUX frame = 19 CK32 cycles An ADC conversion will always consume an integer number of CK32 clocks. Following this is a single CK32 cycle where the bandgap voltage is allowed to recover from the change in CROSS. Figure 19: Timing Relationship between ADC MUX and Compute Engine Each CE program pass begins when the ADC0 conversion (slot 0, as defined by SLOT0_SEL) begins. Depending on the length of the CE program, it may continue running until the end of the last conversion. CE opcodes are constructed to ensure that all CE code passes consume exactly the same number of cycles. The result of each ADC conversion is inserted into the XRAM when the conversion is complete. The CE code is written to tolerate sudden changes in ADC data. The exact clock count when each ADC value is loaded into RAM is shown in Figure 19. Figure 20 shows that the serial data stream, RTM, begins transmitting at the beginning of state S. RTM, consisting of 140 CK cycles, will always finish before the next code pass starts. FLAG RTM DATA 0 (32 bits) 0 1 0 1 0 1 0 1 FLAG FLAG FLAG CK32 MUX_SYNC CKTEST TMUXOUT/RTM 30 31 30 31 30 31 30 31 RTM DATA 1 (32 bits) RTM DATA 2 (32 bits) RTM DATA 3 (32 bits) Figure 20: RTM Output Format CK32 MUX_DIV Conversions (MUX_DIV=6 is shown) Settle ADC MUX Frame ADC EXECUTION MUX_SYNC CE_EXECUTION RTM 140 MAX CK COUNT 0 300 150 600 900 1200 1500 1800 ADC0 ADC1 ADC2 ADC3 ADC4 ADC5 CK COUNT = CE_CYCLES + floor((CE_CYCLES + 2) / 4) NOTES: 1. ALL DIMENSIONS ARE 4.9152 MHz CK COUNTS. 2. XFER_BUSY OCCURS ONCE EVERY (PRESAMPS * SUM_CYCLES) CODE PASSES. CE_BUSY XFER_BUSY INITIATED BY A CE OPCODE AT END OF SUM INTERVAL ADC TIMING CE TIMING RTM TIMING |
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