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SN75LVCP412CDRTJR Datasheet(PDF) 6 Page - Texas Instruments

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Part # SN75LVCP412CDRTJR
Description  Two Channel SATA 3 Gbps Redriver With Cable Detect
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

SN75LVCP412CDRTJR Datasheet(HTML) 6 Page - Texas Instruments

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PC MB
COMRESET
PCH Interlock Pin
eSATA Host
PC MB
COMRESET
CD
Interlock Pin
Without CD feature, eSATA host sends
COMRESETs at frequent intervals (ms) looking for
attached HDD thereby burning power even when
there is no external HDD attached
With 412CD, eSATA host is automatically turned OFF
when no HDD is connected. Power savings of
~100mW - 200mW is possible on host side
eSATA
eSATA Host
eSATA Redriver
W.O. CD feature
412CD
1
2
1
2
SN75LVCP412CD
SLLSE62 – DECEMBER 2010
www.ti.com
Cable Detect Feature (see Figure 4 and Figure 5)
Cable detect mode (for this mode to be active PS and EN must be tied H via a 4.7k
Ω or both pins left as NC.
Device must be placed < 2" (or <5cm) from eSATA connector).
To use this feature CH 1 input must be connected to SATA host while CH 2 input to eSATA connector. After
power up device sets CD = 0, which makes the SATA Host monitoring this pin go into normal SATA OOB state
where host will send out COMRESETs (refer to SATA spec ver. 2.6 Gold) to look for a connected device. The
LVCP412CD has a detector circuit that monitors voltage level at its CH1 outputs which changes based on a
closed or open termination. CD pin polarity at power up is at L and remains L if connection is found. It will
transition to H if connection is not found.
In the event that an eSATA host connected to CH1 of LVCP412CD goes to Partial or Slumber mode and the ext
HDD is removed, then CD pin of device will continue to remain L until Host wakes up from Partial or Slumber
mode and restarts the link by sending out COMWAKE. After the transmission of first valid OOB signal from host
the LVCP412CD will detect that no device is attached to esata socket and thereby pull CD pin H indicating to the
host that device is removed.
eSATA host can utilize the polarity of CD pin to shutdown (CD = 1) or turn ON (CD = 0). When host is in
shutdown mode then no COMRESETs are transmitted thereby saving power. After having established no
connection the LVCP412CD switches to listen mode whereby it listens to COMINTS (refer to SATA spec ver. 2.6
Gold) on CH2. Per SATA spec any SATA compliant peripheral PHY, after power-up, will transmit COMINT in the
event that it does not receive a valid COMRESET from the host. If COMINT is detected by the LVCP412CD on
CH2 it will switch CD status to L indicating a connection has been found. The SATA host that is monitoring the
status of CD pin can now turn-ON as a device is connected and the link training is subsequently established.
Figure 4. Cable Detect
6
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Copyright © 2010, Texas Instruments Incorporated
Product Folder Link(s) :SN75LVCP412CD


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