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XRS10L240 Datasheet(PDF) 10 Page - Exar Corporation |
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XRS10L240 Datasheet(HTML) 10 Page - Exar Corporation |
10 / 38 page EXSTOR - 1 XRS10L240 10 SERIAL ATA II: PORT MULTIPLIER / PORT SELECTOR REV. 1.05 3.1 Out Of Band Feature Each Serial ATA link provides full support for the three Out Of Band (OOB) signals supported by Serial ATA: COMRESET, COMINIT and COMWAKE. These sequences must be separated by idle periods as shown in Figure 5. The sequences are comprised of 106.7ns bursts of activity that are interleaved with varying length stretches of electrical idle. This alternating sequence must be repeated four times to be recognized. An example OOB sequence and the resulting burst and idle widths are shown in Figure 6. If the sequence of burstWidth and idleWidth counts falls within the range specified in the MDIO registers for four consecutive burst/idle sequences, then the link will assert COMINIT or COMWAKE. This OOB signal will remain asserted for as long as the corresponding sequence on the input pins continues. FIGURE 5. COMWAKE AND COMRESET/COMINIT SEQUENCES FIGURE 6. EXAMPLE OOB SEQUENCE COMWAKE COMRESET COMINIT 106.7ns 106.7ns 320ns rxdP, rxdN squelchClock 15 15 15 COMINT = (MaxBurstWidth ≥burstWidth≥MinBurstWidth) && (MaxInitWidth≥idleWidth≥MinInitWidth) COMWAKE = (MaxBurstWidth ≥burstWidth≥MinBurstWidth) && (MaxWakeWidth≥idleWidth³MinWakeWidth) 17 17 17 idleWidth burstWidth |
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