Whether you are a PCB designer implementing a storage subsystem or a technician performing board-level repairs, understanding that UFS requires a host-generated clock and strict differential pair integrity is the key to successfully working with this technology.
Note: In single-lane configurations (common in mid-range devices), only Lane 0 is active.
This guide summarizes the common UFS (Universal Flash Storage) 3.1 BGA/module pinout conventions and signal descriptions for system designers. Assume typical mobile-device connector or BGA module mapping; exact pin names and positions depend on vendor/module footprint — always consult the module/datasheet for final layout and electrical details.
is the standard for high-performance embedded storage found in flagship smartphones (e.g., Samsung Galaxy S21/S22, OnePlus 9/10) and automotive systems. Unlike eMMC, UFS uses a full-duplex serial interface (MIPI M-PHY) supporting separate read and write lanes, offering theoretical speeds up to 2,900 MB/s.
| Pin Number | Pin Name | Description | | --- | --- | --- | | 1 | VDD | Power supply voltage | | 2 | VSS | Ground | | 3 | REFCLK | Reference clock | | 4 | REFCLK | Reference clock (complement) | | 5 | DNC | Do not care (reserved) | | 6 | DNC | Do not care (reserved) | | 7 | RXD0 | Receive data 0 | | 8 | RXD1 | Receive data 1 | | 9 | RXD2 | Receive data 2 | | 10 | RXD3 | Receive data 3 | | 11 | TXD0 | Transmit data 0 | | 12 | TXD1 | Transmit data 1 | | 13 | TXD2 | Transmit data 2 | | 14 | TXD3 | Transmit data 3 | | 15 | CBT | Control signal ( Command, BE and Transfer) | | 16 | VSS | Ground |
Here is the UFS 3.1 pinout:
based on the MIPI M-PHY physical layer. This reduces the number of required signal pins while enabling full-duplex communication (simultaneous reading and writing). Kioxia Singapore Pte. Ltd. Critical Signal Groups
I'm currently working on a trace repair for a mainboard with a UFS 3.1 storage chip. The pads are damaged, and I'm having trouble identifying the specific TX/RX differential pairs under the microscope.
Whether you are a PCB designer implementing a storage subsystem or a technician performing board-level repairs, understanding that UFS requires a host-generated clock and strict differential pair integrity is the key to successfully working with this technology.
Note: In single-lane configurations (common in mid-range devices), only Lane 0 is active.
This guide summarizes the common UFS (Universal Flash Storage) 3.1 BGA/module pinout conventions and signal descriptions for system designers. Assume typical mobile-device connector or BGA module mapping; exact pin names and positions depend on vendor/module footprint — always consult the module/datasheet for final layout and electrical details.
is the standard for high-performance embedded storage found in flagship smartphones (e.g., Samsung Galaxy S21/S22, OnePlus 9/10) and automotive systems. Unlike eMMC, UFS uses a full-duplex serial interface (MIPI M-PHY) supporting separate read and write lanes, offering theoretical speeds up to 2,900 MB/s.
| Pin Number | Pin Name | Description | | --- | --- | --- | | 1 | VDD | Power supply voltage | | 2 | VSS | Ground | | 3 | REFCLK | Reference clock | | 4 | REFCLK | Reference clock (complement) | | 5 | DNC | Do not care (reserved) | | 6 | DNC | Do not care (reserved) | | 7 | RXD0 | Receive data 0 | | 8 | RXD1 | Receive data 1 | | 9 | RXD2 | Receive data 2 | | 10 | RXD3 | Receive data 3 | | 11 | TXD0 | Transmit data 0 | | 12 | TXD1 | Transmit data 1 | | 13 | TXD2 | Transmit data 2 | | 14 | TXD3 | Transmit data 3 | | 15 | CBT | Control signal ( Command, BE and Transfer) | | 16 | VSS | Ground |
Here is the UFS 3.1 pinout:
based on the MIPI M-PHY physical layer. This reduces the number of required signal pins while enabling full-duplex communication (simultaneous reading and writing). Kioxia Singapore Pte. Ltd. Critical Signal Groups
I'm currently working on a trace repair for a mainboard with a UFS 3.1 storage chip. The pads are damaged, and I'm having trouble identifying the specific TX/RX differential pairs under the microscope.