TUSB9261: TUSB9261 HW design check

Hi,

Is TUSB9261 connected directly to a UB Host or Hub? IF so AC coupling is correct. If the USB interface is going to a USB connector the Ac coupling on RX should be removed or replaced with 330 nF. 

Please ensure the proper reset timing will be meet according to 7.3.1.4 Power-Up and Reset Sequence and USB_VBUS should be raised only when a connection is ready to be made on the USB upstream port and tUSB9261 has exited reset.

I do not see the SPI flash in the schematic provided but please refer to TUSB9261 implementation guide for recommendation on SPI flash selection. Please plan to use the TUSB9261 flashburner to program the Flash connected to TUSB9261.   

Hi Malik,

              Thanks for your review, update my design.USB3 to SATA_TUSB9261-0105.pdf

1. The TUSB9261 connected directly to a USB HUB.

2. I modify the USB_VBUS circuit, using the GRST to control the USB_VBUS.<GRST power up & reset timing same as USB HUB reset>

3. The U21 Winbond_W25X10CLSNIG is my SPI chip.

Hi,

GRST changes look good. SPI flash should meet the following requirements:

• The bootloader uses a fixed frequency of 18.75 MHz.
• The flash must use a word size of 8 bits and an address length of 24 bits.
• The program instruction must allow 256 bytes to be written in one operation.
• The entire chip is erased by the bootloader prior to programming.
• A minimum flash size of 512 kbits (64 k x 8) is recommended.

Winbond W25X20CL may be a better fit. 

Hi Malik,

              Due to the PCB Layout routing, i'd like to swap the SATA RXP& RXN signal in HW design, and  can I using the TUSB9261 firmware to swap the RX signal? USB3 to SATA_TUSb9261-1.pdf