Other Parts Discussed in Thread: TUSB1002
Hi All,
There are another two questions about TUSB544 need your help:
1. What frequency can be considered as EQ? 5GHz or other frequency? We can't find in the spec
2. We need detail guide to set the VID and VOD, like what we can find in TUSB1002's spec:
The TUSB1002 compensates for channel loss in both the upstream (D to C) and downstream direction (A to B).
This is done by configuring the CH1_EQ[2:1] and CH2_EQ[2:1] pins to the equalization setting that matches as
close possible to the channel insertion loss. In this particular example, CH1_EQ[2:1] is for path A to B which is
the channel between USB3.1 host and the TUSB1002, and CH2_EQ[2:1] is for path C to D which is the channel
between TUSB1002 and the USB3.1 receptacle.
The TUSB1002 supports 5 levels of DC gain that are selected by the CFG[2:1] pins. Typically, the DC gain
should be set to 0 dB but may need to be adjusted to correct any one of the following conditions:
1. Input VID too high resulting in VOD being greater than USB 3.1 defined swing. For this case, a negative DC
gain should be used.
2. Input VID too low resulting in VOD being less than USB 3.1 defined swing. For this case, a positive DC gain
should be used.
3. Low frequency discontinuities in the channel resulting in DC component of the signal clipping the vertical eye
mask. For this case, a positive DC gain should be used.
There are another two questions about TUSB544 need your help:
1. What frequency can be considered as EQ? 5GHz or other frequency? We can't find in the spec
2. We need detail guide to set the VID and VOD, like what we can find in TUSB1002's spec:
The TUSB1002 compensates for channel loss in both the upstream (D to C) and downstream direction (A to B).
This is done by configuring the CH1_EQ[2:1] and CH2_EQ[2:1] pins to the equalization setting that matches as
close possible to the channel insertion loss. In this particular example, CH1_EQ[2:1] is for path A to B which is
the channel between USB3.1 host and the TUSB1002, and CH2_EQ[2:1] is for path C to D which is the channel
between TUSB1002 and the USB3.1 receptacle.
The TUSB1002 supports 5 levels of DC gain that are selected by the CFG[2:1] pins. Typically, the DC gain
should be set to 0 dB but may need to be adjusted to correct any one of the following conditions:
1. Input VID too high resulting in VOD being greater than USB 3.1 defined swing. For this case, a negative DC
gain should be used.
2. Input VID too low resulting in VOD being less than USB 3.1 defined swing. For this case, a positive DC gain
should be used.
3. Low frequency discontinuities in the channel resulting in DC component of the signal clipping the vertical eye
mask. For this case, a positive DC gain should be used.
