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XRS10L240IV-F Datasheet(PDF) 10 Page - Exar Corporation

Part # XRS10L240IV-F
Description  SERIAL ATA II: PORT MULTIPLIER / PORT SELECTOR
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRS10L240IV-F Datasheet(HTML) 10 Page - Exar Corporation

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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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