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TUSB213: are the USB redriver parts bidirectional or unidirectional

Jeff Sylvester55
Prodigy 70 points
Part Number: TUSB213
Other Parts Discussed in Thread: , TUSB214, TUSB214EVM

Is the TUSB213 part a bidirectional or unidirectional part?  meaning,  Can the host be on either side of the chip, or does it have to be on a specific side?   this is unclear to me.  on the data sheet it says that Host should be on the D1M and D1P side and peripheral should be on the D2M/P side.   does the signal actually flow through the chip?  meaning the usb differential lines from the input type A/B connectors is not a single trace,  (D1M is not tied to a physical trace on D2M, likewise D1P is not tied to a physical trace on D2P).    From the Datasheet documentation: TUSB213EVM:  shows two separate differential pairs, one input pair on D1m/p and one output pair on D2m/p

This statement is from the datasheet on TUSB213 section 8.2 Typical Application.

Typical Application
A typical application is shown in Figure 6. In this setup, D2P and D2M face the USB connector while D1P and
D1M face the USB host or hub. If desired, the orientation may be reversed [that is, D2 faces transceiver and D1
faces connector].

I ask this because there is a similar device, the TUSB214 that appears to have the D1M/P tied to the same net on D2M/P where as the TUSB213 does not?   I am wondering why the difference?  (I am taking this from schematics on TUSB213EVM and TUSB214EVM.  

 

  • 0
    TI__Mastermind 19720 points
    The TUSB213 is a bidirectional part meaning that it does not matter which side, Host or Device, the D1 or D2 pins are connected to. The signal flows through the chip rather than being connected by the trace under the device like the TUSB214. The TUSB213 was designed for a package that did not allow the data lines to be shorted under the device so this is why it is different from the TUSB214.