The TUSB1004 in limited redriver mode offers preshoot and de-emphasis controls for SSRX1/2 transmitter. The TUSB1004 offers four preshoot levels and four de-emphasis levels. These levels can be changed by modifying I²C registers.

SSRX1 transmitter equalization is controlled by TX1_PRESHOOT and TX1_DEEMPHASIS fields. When SSRX_LIMIT_ENABLE = 1 and TX1_PRESHOOT_EN = 1, the TX1_PRESHOOT field selects between four different preshoot levels. When SSRX_LIMIT_ENABLE = 1 and TX1_DEEMPHASIS_EN = 1, the TX1_DEEMPHASIS field selects between four different de-emphasis levels.

SSRX2 transmitter equalization is controlled by TX2_PRESHOOT and TX2_DEEMPHASIS fields. When SSRX_LIMIT_ENABLE = 1 and TX2_PRESHOOT_EN = 1, the TX2_PRESHOOT field selects between four different preshoot levels. When SSRX_LIMIT_ENABLE = 1 and TX2_DEEMPHASIS_EN = 1, the TX2_DEEMPHASIS field selects between four different de-emphasis levels.