UFS transmission lines require strict 100-ohm differential impedance.
In the data recovery and forensics industry, "In-System Programming" (ISP) is a technique used to wire directly to a device's storage chip without desoldering it. With older eMMC standards, soldering 4 to 6 wires (CMD, CLK, DAT0, VCC, VCCQ, GND) to easily accessible motherboard test points allowed technicians to dump the storage chip.
For a high-level comparison of UFS 3.1 vs. other storage, Samsung's UFS Card White Paper explains the underlying architectural advantages of the UFS interface. 🛠️ Hardware Integration Tips UFS (Universal Flash Storage) - JEDEC
If you are designing a circuit, debugging a non-functional phone, or attempting data recovery, focus on these five pins first: ufs 3.1 pinout
Below is a conceptual layout mapping how the core functional balls cluster on a standard BGA 153 UFS 3.1 chip:
Differential data lanes for sending information from the host to the storage device.
| Signal Group | Pin (Lane 0) | Pin (Lane 1) | Description | Differential Impedance | | :--- | :--- | :--- | :--- | :--- | | | R1 (DOUT_T0_P) R2 (DOUT_T0_M) | M1 (DOUT_T1_P) M2 (DOUT_T1_M) | Device Transmit to Host. Positive (P) and Negative (M) diff pair. | 100Ω ±10% | | RX (Host to Device) | T2 (DIN_T0_P) T3 (DIN_T0_M) | P1 (DIN_T1_P) P2 (DIN_T1_M) | Device Receive from Host. Positive and Negative diff pair. | 100Ω ±10% | | REF_CLK | K1 (REF_CLK_P) K2 (REF_CLK_N) | N/A | Differential reference clock (19.2 MHz, 26 MHz, or 38.4 MHz) from host. | 100Ω | For a high-level comparison of UFS 3
| Ball | Signal | Type | Description | |------|--------|------|-------------| | A1 | VCC | Power | NAND flash core power (2.5V - 3.6V, typically 3.3V) | | A2 | VCC | Power | Same as A1 – connect together | | A4 | REF_CLK | Input | Reference clock (26 MHz typical, 19.2 / 38.4 MHz possible) | | A5 | RST_N | Input | Hardware reset (active low, internal pull-up) | | B1 | VCC | Power | NAND core power | | B2 | VCC | Power | NAND core power | | B3 | C/D | Input | Configuration / Boot mode. Pull high (VCCQ) for normal boot, low for test modes. | | B4 | VSS | Ground | Ground | | B5 | VSS | Ground | Ground | | C1 | VCCQ | Power | Controller I/O & logic (1.14V - 1.26V typical 1.2V) | | C2 | VCCQ | Power | Same as C1 | | C3 | D0_RX | Input | Lane 0 – Receiver differential input (from host) | | C4 | D0_TX | Output | Lane 0 – Transmitter differential output (to host) | | D3 | D1_RX | Input | Lane 1 – Receiver differential input | | D4 | D1_TX | Output | Lane 1 – Transmitter differential output | | D5 | VSS | Ground | Ground | | E1 | VCCQ2 | Power | Optional second I/O supply (1.8V or 2.5V). If unused, tie to VCCQ or leave NC. | | ... (center balls omitted) | ... | ... | Most balls in rows E–J / cols 3–10 are reserved or not connected | | L2 | VSS | Ground | Ground | | M1 | VSS | Ground | Ground |
Differential input receiver lane 0.
A unified footprint widely adopted in modern flagship smartphones, often stacking or integrating RAM (LPDDR5) and UFS on a single multi-chip package (uMCP). UFS 3.1 Pinout Signal Categorization | Signal Group | Pin (Lane 0) |
Tied directly to low-dropout (LDO) regulators inside the device PMIC. Technical Challenges: ISP and Data Recovery
| Pin(s) | Symbol | Description | Importance | | :--- | :--- | :--- | :--- | | A2, A3, A4, B1, B2, B3, B4, C1, C2, C3, C4 | | NAND Core Supply – 2.5V to 3.6V (typically 3.3V). Supplies power to the NAND flash array. High current draw during writes. | Critical | | D1, D2, D3, E1, E2, E3, F1, F2, F3, G1, G2, G3, G4 | VCCQ | Controller & I/O Supply – 1.14V to 1.26V (typically 1.2V) or 1.8V. Powers the UFS controller core and M-PHY. | Critical | | A1, K4, L4, M4, N1, N2, N3, N4, N5, N6, N7... | VSS | Ground. All VSS balls must be connected to a solid ground plane. | Critical | | H4, J4 | VCCQ2 | Optional second I/O supply for legacy compatibility. Usually tied to VCCQ. | Low |
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