Part Number: TUSB2077A
Hi all,
I have a new design with the TUSB2077A as a hub for several USB devices on my PCB. When I connect the TUSB2077A to the Host PC, and run a USB debug software like "USB Device Tree Viewer", the TUSB2077A is only displayed as a USB1.1 hub. Also when I copy files from the PCs SSD to a USB stick, I get only about 1MByte/s. Which correlates good with the USB1.1 enumeration.
I tested the USB stick also directly on the PC and it writes with more than 30MByte/s, so thats not the problem.
Initially I forgot the pullup on the DP0/DM0 and put it on the PCB afterwards between DP0 and DP0PUR. But the hub is still enumerated as USB1.1. Changing the Pullup to DM0, the USB hub is still a USB1.1 (as intended).
Any ideas, why the USB hub is only recognized as a USB1.1 hub and not a full-speed device?
This is the output of USB Device Tree Viewer:
========================== USB Hub =========================
------------------- USB Hub Descriptor -----------------
bDescriptorLength : 0x09 (9 bytes)
bDescriptorType : 0x29 (Hub Descriptor)
bNumberOfPorts : 0x07 (7 Ports)
wHubCharacteristics : 0x0009
Power switching : Individual
Compound device : No
Over-current protection : Individual
TT Think Time : At most 8 FS bit times
Port Indicators : Not supported
bPowerOnToPowerGood : 0x32 (100 ms)
bHubControlCurrent : 0x64 (100 mA)
DeviceRemovable : 0x00
Bit 0 : 0 (reserved, any value)
Bit 1 : 0 (Device at Port 1 is removable)
Bit 2 : 0 (Device at Port 2 is removable)
Bit 3 : 0 (Device at Port 3 is removable)
Bit 4 : 0 (Device at Port 4 is removable)
Bit 5 : 0 (Device at Port 5 is removable)
Bit 6 : 0 (Device at Port 6 is removable)
Bit 7 : 0 (Device at Port 7 is removable)
PowerControlMask : 0xFE
Data (HexDump) : 09 29 07 09 00 32 64 00 FE .)...2d..
HubIsBusPowered : 0x00 (Self Powered)
-------------- Extended USB Hub Descriptor -------------
HubType : USB 2.0 Hub
HighestPortNumber : 7
------------------- USB Hub Descriptor -----------------
bDescriptorLength : 0x09 (9 bytes)
bDescriptorType : 0x29 (Hub Descriptor)
bNumberOfPorts : 0x07 (7 Ports)
wHubCharacteristics : 0x0009
Power switching : Individual
Compound device : No
Over-current protection : Individual
TT Think Time : At most 8 FS bit times
Port Indicators : Not supported
bPowerOnToPowerGood : 0x32 (100 ms)
bHubControlCurrent : 0x64 (100 mA)
DeviceRemovable : 0x00
Bit 0 : 0 (reserved, any value)
Bit 1 : 0 (Device at Port 1 is removable)
Bit 2 : 0 (Device at Port 2 is removable)
Bit 3 : 0 (Device at Port 3 is removable)
Bit 4 : 0 (Device at Port 4 is removable)
Bit 5 : 0 (Device at Port 5 is removable)
Bit 6 : 0 (Device at Port 6 is removable)
Bit 7 : 0 (Device at Port 7 is removable)
PowerControlMask : 0xFE
Data (HexDump) : 09 29 07 09 00 32 64 00 FE .)...2d..
----------------- USB Hub Capabilities ----------------
HighSpeedCapable : No
HighSpeed : No
MultiTtCapable : No
HubIsMultiTt : No
ArmedWakeOnConnect : No
IsBusPowered : No
IsRoot : No
Data (HexDump) : 00 00 00 00 ....
