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USB Superspeed Peripherals

Anonymous
Not applicable

In EZ-USB FX 3, a crystal is inserted between the XTALIN pin and the XTALOUT pin

It can be connected, or an external clock can be connected to the CLKIN pin

Although it is described in the data sheet, when connecting to XTALIN / OUT

Is it OK to connect the CLK IN terminal?

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1 Solution
SrinathS_16
Moderator
Moderator

Hello,

The FX3 chooses the input clock based on the FSLC[2:0] pins. Although crystal and clock are connected, FX3 chooses one of those based on the FSLC[2:0] pin strap connection.

Best regards,

Srinath S

View solution in original post

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9 Replies
SrinathS_16
Moderator
Moderator

Hello,

The FX3 chooses the input clock based on the FSLC[2:0] pins. Although crystal and clock are connected, FX3 chooses one of those based on the FSLC[2:0] pin strap connection.

Best regards,

Srinath S

View solution in original post

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Anonymous
Not applicable

thank you for your answer.

As contents that I wanted to check

When input of XTAL IN is selected

Which of the following processes is correct for pin processing of CLK IN

※ PullUp or Pulldown or OPNEN

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SrinathS_16
Moderator
Moderator

Hello,

When you are using XTALIN input, the CLKIN pin can be left floating (unconnected).

Best regards,

Srinath S

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Anonymous
Not applicable

Thank you for your early reply.
I understand that it can be unconnected

Also, if there is a machine thank you for your consideration.

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SrinathS_16
Moderator
Moderator

Hello,

Sorry if I had misunderstood your previous question. Can you please let me know what you mean by "machine"?

Best regards,

Srinath S

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Anonymous
Not applicable

Is it about the use of machines that use devices?

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Anonymous
Not applicable

There is content that you want me to check by adding 1 point

As a terminal for CYUSB 3014-BZXIT boot option
Below, when not using the function Which processing will be the terminal processing
※ Pullup or Pulldown or OPEN

· FX 3 boot option I 2 C
⇒ I2C_GPIO [58/59]
· FX 3 Boot Option SPI
⇒ GPIO [53/54/55/56]
· JTAG
⇒ TCK / TMS / TRST # / TDO / TDI

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SrinathS_16
Moderator
Moderator

Hello,

- I2C lines need to be added with a pull up resistor recommended value being 2kohm.

- SPI lines and JTAG lines do not need a pull-up or pull-down resistor and can be left open.

Best regards,

Srinath S

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Anonymous
Not applicable

OK. Thank you for your reply.

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