SD Specifications Part 1 UHS-II Simplified Addendum - SD Association

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UHS-II Simplified Addendum Version 1.01©Copyright 2010-2013 SD Card AssociationConnection Topologies3.1.1 Point to Point ConnectionMinimum topology is consisting one Host and one Device is called "Point to Point" connection. Figure3-2 shows the connection of a Host and a Device.CPU S/WLegacySD I/FHostTxUHS-II I/FControllerTx RxD0 Lane (Downstream)includingD0.Tx, D0.Rx Port and D0 LineHost PHYincludingRCLK.Tx, D0.Tx and D1.Rx PortRCLK LineD0 LineLegacySD I/FRCLK LaneincludingRCLK.Tx, RCLK.RxPort and RCLK LineRxDeviceRxControllerUHS-II I/FTxD1 LineLinkincludingRCLK, D0 and D1 LaneDevice PHYincludingRCLK.Rx, D0.Rx and D1.Tx PortD1 Lane (Upstream)includingD1.Tx, D1.Rx Port and D1 LineFigure 3-2 : Point to Point Topology (FD mode)In UHS-II interface, both Host and Device have a PHY and a Controller which are responsible forperforming Physical and Link / Transaction layer functions respectively. And UHS-II interface areconnected by the following three Lanes. RCLK: transmits reference clock to Device from Host. D0: is a data Lane. It transmits commands, data, or other packets from Host to Device(downstream). D1: is another data Lane. It transmits responses, data, or other packets from Device to Host(upstream).In general, each Lane consists of a Tx (Transmitter) Port and an Rx (Receiver) Port and a transmissionLine between them. The notations used in this specification are used to specify each Tx or Rx Portclearly. For instance, Tx Port of RCLK Lane is described as RCLK.Tx and Rx Port of RCLK Lane isdescribed as RCLK.Rx. The same rule is applied for other Lanes. And all Lanes are collectively calledLink. Host PHY (PHY of Host) includes RCLK.Tx, D0.Tx and D1.Rx. Similarly, Device PHY (PHY ofDevice) includes RCLK.Rx, D0.Rx and D1.Tx.All following descriptions relate to interface with two data Lanes. The optional case of 3 or 4 Lanes isdescribed in Chapter 9.Figure 3-3 shows the connection of Host and Device supporting 2L-HD mode.4
UHS-II Simplified Addendum Version 1.01©Copyright 2010-2013 SD Card AssociationCPU S/WLegacySD I/FHostTxUHS-II I/FControllerTx/Rx Rx/TxD0 Lane (default Downstream)includingD0.Tx, D0.Rx Port and D0 Line(D0.Tx / D0.Rx Port also have Rx / Tx respectively)Host PHYincludingRCLK.Tx, D0.Tx and D1.Rx PortRCLK LineD0 LineRCLK LaneincludingRCLK.Tx, RCLK.RxPort and RCLK LineD1 LineLinkincludingRCLK, D0 and D1 LaneLegacySD I/FRxDeviceRx/TxControllerUHS-II I/FTx/RxDevice PHYincludingRCLK.Rx, D0.Rx and D1.Tx PortD1 Lane (default Upstream)includingD1.Tx, D1.Rx Port and D1 Line(D1.Tx / D1.Rx Port also have Rx / Tx respectively)Figure 3-3 : Point to Point Topology (Supporting 2L-HD Mode)The default direction of D0 Lane is downstream, and D1 is upstream. If Host decides to send data toDevice in 2L-HD mode, D1 Lane changes downstream temporarily (Figure 3-4 (a)). Similarly if Hostdecides to get data from Device in 2L-HD mode, D0 changes upstream (Figure 3-4 (b)). As a result, allPorts for data Lanes are necessary to have both functions of Tx and Rx.(a)(b)CPU S/WCPU S/WLegacySD I/FHostTxUHS-II I/FControllerTx/Rx Rx/TxD0 Lane(Downstream)Host PHY(D1.Rx Port is temporarily switched to Tx)LegacySD I/FHostTxUHS-II I/FControllerTx/Rx Rx/TxD0 Lane(temporary Upstream)Host PHY(D0.Tx Port is temporarily switched to Rx)LegacySD I/FRxDeviceRx/TxControllerUHS-II I/FTx/RxDevice PHY(D1.Tx Port is temporarily switched to Rx)D1 Lane(temporarily Downstream)LegacySD I/FDeviceControllerUHS-II I/FFigure 3-4 : Direction Changing in 2L-HD ModeRxRx/TxTx/RxDevice PHY(D0.Rx Port is temporarily switched to Tx)D1 Lane(Upstream)3.1.2 Multi-device ConnectionIn order that Host can control or communicate with multiple Devices, UHS-II provides Multi-deviceconnection. There are two types of topologies to realize Multi-device connection, one is Ring connectionand the other is Hub connection. Ring connection is introduced to realize a cost effective topology thatminimizes the total number of PHY in the embedded system. And Hub connection is introduced torealize more flexible topology compared to Ring, in terms of capability of hot insertion and removal.Note that RCLK shall be distributed individually to removable Devices, and not only UHS-II interface butalso Legacy SD interface shall be connected to removable Devices.5
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SD Specifications Part 1 UHS-II Simplified Addendum - SD Association

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