SLLSFZ7 February 2025 TUSB1146-Q1
PRODUCTION DATA
The Full AEQ mode attempts to find the best equalization value for RX1 and RX2 receivers by starting at the lowest EQ value and sweeping through all EQ combinations up to the value programmed into FULLAEQ_UPPER_EQ field. The default is to sweep through all sixteen EQ values (zero to fifteen). The number of EQ combinations can be reduced by programming FULLAEQ_UPPER_EQ register. The TUSB1146-Q1 also provides the ability to add or subtract some over/under equalization to compensate for channel in front of the TUSB1146-Q1 by programming OVER_EQ_CTRL field to a non-zero value. If OVER_EQ_SIGN = 0, the TUSB1146-Q1 adds the value programmed into OVER_EQ_CTRL to the EQ value determined by the full adaptation. If OVER_EQ_SIGN = 1, the TUSB1146-Q1 subtracts the value programmed into OVER_EQ_CTRL from the EQ value determined by the full adaptation. For example, if full adaptation determines the best equalization value to be 4 and OVER_EQ_CTRL is 2 and OVER_EQ_SIGN = 0, the EQ setting used by the TUSB1146-Q1 is 6. The TUSB1146-Q1 hardware always limits the sum of OVER_EQ_CTRL and the determined optimal EQ from full adaptation to be less than or equal to 15.