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SN75LVCP412CDRTJR Datasheet(PDF) 6 Page - Texas Instruments |
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SN75LVCP412CDRTJR Datasheet(HTML) 6 Page - Texas Instruments |
6 / 21 page 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 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s) :SN75LVCP412CD |
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