Mac pro usb ports not working because of ram

#Mac pro usb ports not working because of ram driver

PEX x8 shared PCIe slot 2 (MPX bay 1, upper slot) PEX x8 shared MPX slot 2 (MPX bay 2, proprietary slot)Д¬PU x16 PCIe slot 3 (MPX bay 2, lower slot) PEX x8 shared + x8 PCIe slot 4 (MPX bay 2, upper slot) PEX x4 PCIe slot 8 / Apple I/O card dual-port Thunderbolt 3 (Intel JHL7540) PEX x4 dual-port Thunderbolt 3 (Intel JHL7540) HereвЂ™s my best guess as to the PCIe lane distribution: That leaves 32 lanes from the CPU, 64 lanes from the PEX8796, and 20 from the C621 PCH for downstream devices. Xeon W=32xx CPUs have 64 PCIe lanes, 32 of which are connected to the 96-lane PEX8796. There is probably only a single stepping of Titan Ridge silicon, but for obvious reasons, that mux would have to be either fused off or fixed in firmware for host implementations. In 2-port device configurations, USB 2.0 is routed directly from the upstream port controller to the downstream port controller, unless the design requires USB 2.0 for some reason, in which case itвЂ™s routed to the upstream facing port of a hub instead.ДЄs for JHL7440 support for USB3 hosts, the simplest way to achieve this logically is for the downstream Thunderbolt and dedicated USB ports to be connected to the downstream facing ports of a hub, with the upstream facing port of the hub connected to a 2:1 mux which can switch between the upstream Thunderbolt port and the integrated xHCI depending on the capabilities of the attached host. In a host setup, the signals are routed from the PCH to each Thunderbolt port controller. Upon further consideration, IвЂ™m pretty sure USB 2.0 never touches the Thunderbolt controllers. And so there donвЂ™t appear to be any shenanigans required for USB on Titan Ridge in peripheral mode.ДЄs far as I know, You can only use both USB ports of Alpine Ridge when it is in host mode which has both Thunderbolt ports as downstream. So what makes the JHL7440 special is that it can accept USB-C with DisplayPort alt mode as input through a Thunderbolt port.

The Blackmagic eGPU is similar to my dock but it uses a JHL7540 so maybe all Titan Ridge chips have the separate USB output. I have tested a USB 2.0 mouse and a USB 3.x flash drive. The USB output of the Titan Ridge is just for USB (port 2 for USB 2.0 and port 4 for USB 3.x). The downstream Thunderbolt port can be used for USB (port 1 for USB 2.0, port 3 for USB 3.x), DisplayPort, or Thunderbolt. The Titan Ridge is different than Alpine Ridge because it has a USB output that is separate from the two Thunderbolt outputs.

#Mac pro usb ports not working because of ram driver

Yes, the driver for the USB 2.0 port on my Titan Ridge dock is AppleUSBXHCITR. The audio codec probably needs a couple S2I connections to the T2 chip. ThereвЂ™s also the JHL7540, a pair of TI CD3217B or similar USB PD/Type-C port controllers, and possibly a Cirrus Logic CS42L83 audio codec on the card, but you canвЂ™t make out any of the part numbers. I did spy a pair of TI TUSB1002A USB 3.2 10 Gbit/s dual-channel linear redrivers on the I/O card, which would be for the USB 3.0 signals routed from the PCH to the USB Type-A ports via the proprietary portion of the I/O card connector.

Which is one too many for the PCH, so there must be a hub or additional USB 2.0 EHCI somewhere to make that work. So now you have me thinking, the C621 PCH only provides 14 USB 2.0 ports, and by my count:Дў for the Thunderbolt 3 ports on the top of the caseДў for the Thunderbolt 3 ports on the Apple I/O cardДў for the USB 3.0 Type-A ports on the Apple I/O cardД¤ for MPX slot 1 (up to 4 Thunderbolt 3 ports)Д¤ for MPX slot 2 (up to 4 Thunderbolt 3 ports)