Switchless USB C-connector hub
A USB hub integrated circuit device, comprising USB hub logic comprising a plurality USB ports, wherein at least one port comprises a pair of bi-directional transmission channels, wherein for the at least one port two physical layers are provided in parallel, each physical layer being associated with one bidirectional transmission channel, wherein the USB hub logic is further configured to select one of said physical layers for each port depending on a logic condition.
1. A USB hub integrated circuit device, comprising
USB hub logic comprising a plurality USB ports, wherein:
at least one port comprises a pair of bi-directional transmission channel;
two physical layers are directly connected to the at least one port, wherein each physical layer being associated with one bidirectional transmission channel;
the USB hub logic is further configured to select one and only one of said physical layers for each port depending on a logic condition; and
the at least one port is a USB3 compliant port.
2. The USB hub integrated circuit device according to claim 1 , wherein the logic condition is determined through another connection provided by the at least one port.
3. The USB hub integrated circuit device according to claim 2 , wherein the at least one port further comprises a further transmission channel compliant with USB2.
4. The USB hub integrated circuit device according to claim 1 , further comprising another port comprising a pair of bi-directional transmission channels, wherein for the another port two further physical layers are provided in parallel, each physical layer being associated with one bidirectional transmission channel of the another port, wherein the at least one port is a down-stream port and the another port is an up-stream port.
5. The USB hub integrated circuit device according to claim 4 , further comprising at least one USB 2 legacy port.
6. The USB hub integrated circuit device according to claim 1 , further comprising an embedded controller configured to control a selection of respective physical layers of each port.
7. The USB hub integrated circuit device according to claim 1 , further comprising a multiplexer associated with the at least one port and configured to either select signals provided by the first or second physical layer.
8. The USB hub integrated circuit device according to claim 7 , wherein the physical layer provides a plurality of transmission and reception digital lines for each bidirectional channel.
9. The USB hub integrated circuit device according to claim 8 , wherein the plurality of transmission and reception digital lines comprise 32 transmission lines and 32 reception lines.
10. The USB hub integrated circuit device according to claim 9 , wherein the plurality of transmission and reception digital lines are configured to transmit signals at a clock rate of 125 MHz.
11. A USB hub comprising:
a USB hub integrated circuit device including USB hub logic including a plurality of USB ports, wherein:
at least one port comprises a pair of bi-directional transmission channels;
two physical layers are directly connected to the at least one port, each physical layer being associated with one bidirectional transmission channel; and
the USB hub logic is further configured to select one and only one of said physical layers for each port depending on a logic condition; and
an external connector having connection pins that are arranged symmetrical such that first bi-directional lines of an associated plug inserted into the external connector are either connected with first bi-directional lines of the connector or second bi-directional lines of the connector depending on an insertion direction of the plug;
wherein the at least one port is a USB3 compliant port.
12. The USB hub according to claim 11 , wherein the connector comprises a row of upper connection pins and a row of lower connection pins, wherein the upper row comprises in sequence the following USB signals: Gnd, TX 1 +, TX 1 −, VBUS, configuration channel 1 (CC 1 ), D+, D−, TBD, VBUS, RX 2 −, RX 2 +, Gnd, and
the lower row comprises in sequence the following USB signals: Gnd, RX 1 +, RX 1 −, VBUS, TBD, D−, D+, configuration channel 2 (CC 2 ), VBUS, TX 2 −, TX 2 +, Gnd, wherein TBD designates a connection which may not be used.
13. The USB hub according to claim 12 , wherein the logic condition is determined through the CC 1 or CC 2 signal of each port.
14. The USB hub according to claim 11 , further comprising at least one USB 2 legacy port.
15. The USB hub according to claim 11 , wherein the USB hub integrated circuit device further comprises an embedded controller configured to control a selection of respective physical layers of each port.
16. A method for operating a USB hub, the USB hub comprising:
a USB integrated circuit device including USB hub logic including a plurality of USB ports, wherein:
at least one port comprises a pair of bi-directional transmission channels;
two physical layers are directly connected to the at least one port, wherein each physical layer being associated with one bidirectional transmission channel; and
the USB hub logic is further configured to select one and only one of said physical layers for each port depending on a logic condition; and
an external USB Type-C connector having connection pins that are arranged symmetrical that first bi-directional lines of an associated plug inserted into the external connector are either connected with first bi-directional lines of the connector or second bi-directional lines of the connector depending on an insertion direction of the plug;
the method comprising:
plugging in USB3 Type-C plug into the USB3 Type-C connector in a first configuration;
decoding configuration lines coupled to respective configuration contacts of the USB3 Type-C connector by the USB hub; and
selecting a first one of the physical layers associated with the USB3 Type-C connector.
17. The method according to claim 16 , wherein when said USB3 Type-C plug is plugged into the USB3 Type-C connector in a second configuration which is upside down with respect to the first configuration, the method comprises:
decoding the configuration lines of the USB3 Type-C connector by the USB hub; and
selecting a second one of the physical layers associated with the USB3 Type-C connector.