Part Number: TUSB8042A
We are Using TUSB8042A Hub IC and We want to use 3 Downstream Ports (port1:- USB3, Port2:- USB3, Port3:- USB2) out of 4 Downstream Ports provided in Hub, but only Port2 is working and other 2 ports are not detecting, attaching a schematic for reference.
We are not using any communication interface (I2C or SMBUS) and Hub ic is in default configuration mode.
Do we need to configure the Hub IC to be able to work in multi-port mode?
By default, it should work As the default configuration of USED[3:0] = 1111
Please confirm that
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In reply to JMMN:
We are using a 24MHz Crystal and we have a good thermal pad connection.
Yes, 0.1uf capacitors are mounted on SSTX lines, both upstream and downstream side
We are giving a 5V supply from the external source and there is a 4A Efuse to protect the downstream ports
Regarding GRSTz: We have tested both the ways, but the performance is the same
1. removed the resistor and capacitor on GRSTz
2. By driving the external signal on GRSTz
In reply to b manohar:
What operating system is being used? Can you confirm that both USB 2.0 and USB 3.0 speed devices can be seen on Port 2? How many units are you seeing this issue on?
We are using Linux Ubuntu
We have connected both USB2 & USB3 device to Port2 at a time using an external USB Hub and we are able to see both the devices
We have assembled this IC in two boards and both have this issue.
Please check your connector layout and confirm that VBUS is available on all the downstream ports.
We have found the issue, Hbub IC is working fine.
The issue is that we have used a custom cable and connector for Port 1 and Port 3 where TX is going to TX instead of RX.
Thanks for your support.
Glad you found the issue!
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