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Diffstat (limited to 'Documentation/networking/phy.rst')
| -rw-r--r-- | Documentation/networking/phy.rst | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/Documentation/networking/phy.rst b/Documentation/networking/phy.rst index 704f31da5167..1283240d7620 100644 --- a/Documentation/networking/phy.rst +++ b/Documentation/networking/phy.rst @@ -120,7 +120,7 @@ required delays, as defined per the RGMII standard, several options may be available: * Some SoCs may offer a pin pad/mux/controller capable of configuring a given - set of pins'strength, delays, and voltage; and it may be a suitable + set of pins' strength, delays, and voltage; and it may be a suitable option to insert the expected 2ns RGMII delay. * Modifying the PCB design to include a fixed delay (e.g: using a specifically @@ -308,6 +308,25 @@ Some of the interface modes are described below: rate of 125Mpbs using a 4B/5B encoding scheme, resulting in an underlying data rate of 100Mpbs. +``PHY_INTERFACE_MODE_QUSGMII`` + This defines the Cisco the Quad USGMII mode, which is the Quad variant of + the USGMII (Universal SGMII) link. It's very similar to QSGMII, but uses + a Packet Control Header (PCH) instead of the 7 bytes preamble to carry not + only the port id, but also so-called "extensions". The only documented + extension so-far in the specification is the inclusion of timestamps, for + PTP-enabled PHYs. This mode isn't compatible with QSGMII, but offers the + same capabilities in terms of link speed and negotiation. + +``PHY_INTERFACE_MODE_1000BASEKX`` + This is 1000BASE-X as defined by IEEE 802.3 Clause 36 with Clause 73 + autonegotiation. Generally, it will be used with a Clause 70 PMD. To + contrast with the 1000BASE-X phy mode used for Clause 38 and 39 PMDs, this + interface mode has different autonegotiation and only supports full duplex. + +``PHY_INTERFACE_MODE_PSGMII`` + This is the Penta SGMII mode, it is similar to QSGMII but it combines 5 + SGMII lines into a single link compared to 4 on QSGMII. + Pause frames / flow control =========================== |