38.8.6 USB PAD Calibration
| Symbol | Description | Symbol | Description | Symbol | Description |
|---|---|---|---|---|---|
| R | Readable bit | HC | Cleared by Hardware | (Grey cell) | Unimplemented |
| W | Writable bit | HS | Set by Hardware | X | Bit is unknown at Reset |
| K | Write to clear | S | Software settable bit | — | — |
| Name: | PADCAL |
| Offset: | 0x028 |
| Reset: | 0x0000 |
| Property: | PAC Write-Protection |
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| TRIM[2:0] | TRANSN[4:2] | ||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | |||
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | |||
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| TRANSN[1:0] | TRANSP[4:0] | ||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | ||
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||
Bits 14:12 – TRIM[2:0] Trim bits for DP/DM
These bits calibrate the matching of rise/fall of DP/DM.
Bits 10:6 – TRANSN[4:0] Trimmable Output Driver Impedance N
These bits calibrate the NMOS output impedance of DP/DM drivers.
Bits 4:0 – TRANSP[4:0] Trimmable Output Driver Impedance P
These bits calibrate the PMOS output impedance of DP/DM drivers.