37.15.1 PHY Control Register 00
Note: The USB PHY values must be loaded from the CAL OTP area into
the USB PHY registers by software, before enabling the USB, to achieve the specified
accuracy.
| 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: | PHY00 |
| Offset: | 0x1500 |
| Reset: | 0x00000019 |
| Property: | PAC Write-Protection |
| Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
| Access | |||||||||
| Reset |
| Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
| Access | |||||||||
| Reset |
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| Access | |||||||||
| Reset |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| RXPHSSEL[2:0] | SLEWRATE[1:0] | PREEMP[2:0] | |||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 1 | |
Bits 7:5 – RXPHSSEL[2:0] RX Clock Phase Select
The delay associated with each step is 256ps.
| Value | Description |
|---|---|
| 111 | Represents the latest phase (7 * 256ps) |
| 110 | - |
| 100 | - |
| 011 | - |
| 010 | - |
| 001 | - |
| 000 | Represents the earliest phase (0 * 256ps) |
Bits 4:3 – SLEWRATE[1:0] Adjustment for FS/LS Slew Rate
| Value | Description |
|---|---|
| 11 | Slowest Slew Rate |
| 10 | - |
| 01 | - |
| 00 | Fastest Slew Rate |
Bits 2:0 – PREEMP[2:0] Pre-Emphasis Setting
| Value | Description |
|---|---|
| 111 | Enable pre-emphasis always |
| 110 | Enable pre-emphasis during chirp and non-chirp |
| 100 | Enable pre-emphasis during non-chirp |
| 011 | Enable pre-emphasis during SOF and EOP and chirp |
| 010 | Enable pre-emphasis during chirp |
| 001 | Enable pre-emphasis during SOF and EOP |
| 000 | Disable pre-emphasis |