Is the USB SS connection correct?
Added by Masayoshi Furuta 10 months ago
The J3Pin-Out (Table 7) of the MitySOM-AM57 System on Module data sheet describes the USB3.0 SuperSpeed terminals as follows.
Pin27 AC11 USB1_SSRX_N
Pin29 AD11 USB1_SSRX_P
Pin33 AF12 USB1_SSTX_N(2)
Pin35 AE12 USB1_SSTX_P(2)
Note2: 0.1uF AC coupling caps are installed on the SOM for USB1_SSTX_P/N nets, do not add them to the baseboard.
However, looking at the CPU datasheet, it looks like this:
AC11 usb_txn0 Output (transmitter: ODS)
AD11 usb_txp0 Output (transmitter: ODS)
AF12 usb_rxn0 Input (receiver: IDS)
AE12 usb_rxp0 Input (receiver: IDS)
MitySOM-AM57 System on Module (J3, J14)) ~ HD3SS3220IRNHR (U12) ~ USB TypeC (J13) connection (SSTX_P / _N, SSRX_P / _N) is there any problem with the circuit diagram below?
Schematic: 80-001317RH-5_SCH_RevA.PDF (Date: 6/7/2023 Time: 11:25:44AM)
Replies (9)
RE: Is the USB SS connection correct? - Added by Michael Williamson 10 months ago
Hi Masayoshi,
It looks like there is an error in the datasheet.
Pin 33/35 are connected to AC11/AD11 on the FPGA (USB_TXN/P0), with AC coupling (DC blocking) capacitor.
Pin 27/29 are connected to AF12/AE12 (USB_RXN/P0) as straight connections.
The netnames and polarity is correct, the FPGA AM572x ball names are flipped.
We will correct the datasheet, I will let you know when it has been updated.
I am sorry for the inconvenience.
With regards,
Mike
RE: Is the USB SS connection correct? - Added by Jonathan Cormier 10 months ago
Correction: Replace FPGA with ARM
RE: Is the USB SS connection correct? - Added by Masayoshi Furuta 10 months ago
Pin 33/35 are connected to AC11/AD11 on the FPGA (USB_TXN/P0), with AC coupling (DC blocking) capacitor.
Will this one also be corrected as follows?
Incorrect: FPGA (USB_TXN/P0)
Correct: AM572x (USB_TXN/P0)
RE: Is the USB SS connection correct? - Added by Masayoshi Furuta 10 months ago
MitySOM-AM57 System on Module (J3, J14)) ~ HD3SS3220IRNHR (U12) ~ USB TypeC (J13) connection (SSTX_P / _N, SSRX_P / _N) is there any problem with the circuit diagram below?
Schematic: 80-001317RH-5_SCH_RevA.PDF (Date: 6/7/2023 Time: 11:25:44AM)
Can I assume that aside from the pin names, there are no problems with the schematic connections?
RE: Is the USB SS connection correct? - Added by Michael Williamson 10 months ago
Hello,
I had edited my previous post to correct. Yes it is:
Correct: AM572x (USB_TXN/P0)
The 80-001317RH-5_SCH_RevA.PDF should properly connect the USB-3. You can assume it is OK.
-Mike
RE: Is the USB SS connection correct? - Added by Jonathan Cormier 10 months ago
Here is a snapshot from the devkit design in case it helps. The full schematic is available in the files section.
RE: Is the USB SS connection correct? - Added by Sandeep Sivadas 10 months ago
Hi,
Can you please share the schematic design file location in the website. I am getting old schematic design from the "files" link.
With regards
Sandeep S
RE: Is the USB SS connection correct? - Added by Jonathan Cormier 10 months ago
Thanks for pointing that out. Posted updated schematics and noted them on this new wiki page. https://support.criticallink.com/redmine/projects/mitysom_am57x/wiki/Development_Kit_Revision_Information
