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USB hosts hubs transceivers

NoAr_1540581
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Hello

I am understanding  that unused pins can be left unconnected.But , please let me know if there is any problem in the following cases.

Q1)  If PORT4  is not used, is it okay to set the Fixed port (FIXED_PORT4: Pull up)?
Q2)  If PORT4 is not used, should SET_PORT_NUM1 / 2 also be [NUM2: NUM1] = [0 (PD): 1 (PU)]?

 

Best Regards

Arai

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1 Solution
MallikaK_22
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Hi,

1) If PORT 4 is not used, you can leave FIXED_PORT4 NC.

2) Yes, when PORT_4 is not being used, configuring SET_PORT_NUM2 / 1 to 0:1 is fine.

Regards,

Mallika

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4 Replies
MallikaK_22
Moderator
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Hi,

1) If PORT 4 is not used, you can leave FIXED_PORT4 NC.

2) Yes, when PORT_4 is not being used, configuring SET_PORT_NUM2 / 1 to 0:1 is fine.

Regards,

Mallika

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NoAr_1540581
Level 5
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Hello

Thank you for your reply.

>1) If PORT 4 is not used, you can leave FIXED_PORT4 NC.

>

I understand that if PORT4 is unused, it is okay to leaveFIXED_PORT4 unconnected.
However, when PORT4 is not used, I would like to know whether there is no problem even if the setting of FIXED_PORT4 is "pull up"?or not

 

Best Regards

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NoAr_1540581
Level 5
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Hello

From the contents of the answer, I understand that there is no problem with the following configuration when PORT4 is not used.
--leave FIXED_PORT4 NC.
--configuring SET_PORT_NUM2 / 1 to 0: 1

Q1) Is it okay to consider the above answer as a recommended setting?

Also, if the customer does not use PORT4, there is a question as to whether there is a problem with the following setting cases,too.

Q2) FIXED_PORT4: Pull up -- Is it okay to pull up? (When PORT4 is not used)

Q3 Is it okay to set SET_PORT_NUM2 / 1 to 0: 0? (When PORT4 is not used)

Best regards

Arai

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MallikaK_22
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Hello Arai-san,

1) Yes it is the recommended setting.

2) It is not fine to pull-up FIXED_PORT4 if PORT 4 is not used. Leave it floating.

3) Kindly refer to Table 3, Page 17 in the HX2VL datasheet for configuring SET_PORT_NUM2/1.

Regards,

Mallika

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