TUSB216: About RX_SEN and BOOST features

Hello,

shirakawa-keigo said:

Can you tell me what I can configure?

RX_SEN Levels are High, Medium, and Low. For example, High is how the signal is set?

RX_SEN is used to compensate for channel loss by adding gain to the system, helping it to overcome long distances and accommodate high attenuation.

RX_SEN can be set using Low, Medium, and High, with each level adding more gain to the system, allowing the vertical eye opening to increase. The setting that should be used should be determined by looking at the eye diagram of your signal, and determining if RX_SENS is set high enough, or needs to go higher.

shirakawa-keigo said:

Can you tell me what I can configure?

BOOST Level is 0~3. For example, how does Level 3 set the signal?

The BOOST pin affects the levels of AC and DC boost that are being added to the device.

AC Boost helps to improve the rising and falling edges of the eye, ensuring they maintain their rigidity. DC Boost affects the levels of VHigh and VLow, increasing the vertical opening of the eye to ensure the mask/standard spec is not violated due to a lack of voltage in the signal.

Boost level 3 is the highest strap setting, while Boost level 0 is the lowest setting. These should also be configured by looking at your eye diagram, determining that areas need to be improved, and increasing the level of BOOST as needed.

Please let me know if you have any other questions.

Thanks,

Ryan

Hi, Ryan san

Thank you for your reply.

I would like to ask you something additional.

◆RX_SEN

・Is the order of highest gain as follows?

High　＞　Medium＞　Low

・What is the value of gain (dB) that increases with each setting?

High

Medium

Low

◆BOOST

・If I want the edge to be the sharpest angle, should I set it to 0?

Thanks,

Shirakawa

Hi Shirakawa-san,

shirakawa-keigo said:

Is the order of highest gain as follows?

High　＞　Medium＞　Low

・What is the value of gain (dB) that increases with each setting?

Yes, that order is correct. However, we do not spec the amount of gain that is added with these settings, as it is dependent on the system. Generally, we recommend using the high settings for high-loss systems, and the low setting for low-loss systems.

shirakawa-keigo said:

◆BOOST

・If I want the edge to be the sharpest angle, should I set it to 0?

If you want to give your signal a sharper edge, then the BOOST setting should be set to 3 to enable AC Boost 3. Keep in mind, however, that this will also set DC Boost to 3, which, in cases where there is not a large distance between the device and the host, may lead to disconnects due to the voltage thresholds being passed. Additionally, you can use I2C to individually set these boost settings.

Please let me know if you have any other questions.

Thanks,

Ryan