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XRS10L140IV Datasheet(PDF) 9 Page - Exar Corporation |
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XRS10L140IV Datasheet(HTML) 9 Page - Exar Corporation |
9 / 36 page EXSTOR XRS10L140 9 REV. 1.05 SERIAL ATA II: PORT MULTIPLIER 3.2 Power Down Modes The XRS10L240 features independent support for the 3 power modes, as follows: • Active: All parts of the link are active. All power-down signals are de-asserted. • Partial: In partial mode, the input and output pipelines are shut down, but the PLL and the OOB generation circuits are active. • Slumber: In slumber mode, the PLL is also shut down, saving additional power but adding latency on exit. The XRS10L240 transceiver components (transmitter, receive CDR, PLL, etc.) can be powered down through MDIO register settings. Please refer to Table 12, “Powerdown Registers (MDIO Devices 1, 2 & 3),” on page 26 Please refer to “XRS10L240/140 Errata Sheet” for details regarding Link Power Management. 3.3 Speed Negotiation The XRS10L140 will automatically perform speed negotiation with the host and devices in order to verify whether the second generation Serial ATA 3.0 Gbps data rate is available or whether the system will need to fall back upon the first generation Serial ATA 1.5 Gbps data rate. Speed negotiation is performed on an independent basis by each of the dual-channel macros. Speed negotiation is done independently on all host and device ports by default. MDIO configuration can request a common negotiated speed on the host and device ports if such a speed exists. To perform speed negotiation with a downstream device, the XRS10L140 will first perform a COMRESET/COMINIT handshake with the device and then performs a calibrate/ COMWAKE handshake. Following receipt of the device COMWAKE signal, the XRS10L140 will continually send out a D10.2 signal while awaiting receipt of the device ALIGN primitive. Depending on the speed of the ALIGN primitive, the XRS10L140 will be able to determine the PHY generation of the device, and provide the appropriate 1.5 Gbps or 3.0 Gbps ALIGN primitive in return to the device, thus completing speed negotiation. This process is outlined in Figure 7. For speed negotiation with an upstream host, after the COMRESET/COMINIT and COMWAKE handshake is complete, the XRS10L140 will initially send out an ALIGN primitive at the 2nd generation 3.0 Gbps data rate. If no confirming 3.0 Gbps ALIGN primitive is received from the host, the XRS10L140 will then step down and attempt negotiation at the lower 1.5 Gbps data rate. 3.4 Port Multiplier Implementation The XRS10L140 provides full support for the functionality outlined in the Serial ATA II Port Multiplier specification. A Serial ATA II Port Multiplier is a mechanism for one active host connection to communicate FIGURE 7. SERIAL ATA SPEED NEGOTIATION |
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