Tool/software:
Hi,
When performing diagnostic evaluations of the LMH1297 retimer customers often want to adjust input cable EQ from the IO side. In these cases we recommend disabling the EQ adaptation and performing the following register sequence to manually adjust the cable EQ:
| Command | Register | Value | Mask |
| //Select the ConfigIO page | 0xFF | 0x05 | 0x05 |
| //Disable EQ Adaptation | 0x00 | 0xC0 | 0xC0 |
| //Write the cable EQ value | 0x24 | xx | 0x1F |
| //Read the cable EQ value | 0x25 | xx | 0x1F |
After writing the cable EQ value in ConfigIO register 0x24, read the updated value in 0x25 to ensure that the device's cable EQ value has changed.
Best regards,
Nick