What is XCVR_TX_PRE_EMP_2ND_POST_TAP_USER range for Arria V, Stratix V SG / GX?

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Valid XCVR_TX_PRE_EMP_2ND_POST_TAP_USER range is positive values between 0 and 31 and value mapping rules with XCVR_TX_PRE_EMP_2ND_POST_TAP are shown in the following table.

XCVR_TX_PRE_EMP_2ND_POST_TAP_USER values includes sign info while XCVR_TX_PRE_EMP_2ND_POST_TAP requires a sign bit. XCVR_TX_PRE_EMP_2ND_TAP_USER uses 1-15 for negative values and 17-31 for positive values without sign bit while XCVR_TX_PRE_EMP_2ND_POST_TAP assigns common values, 0-15 with sign bit.

XCVR_TX_PRE_EMP_2ND_POST_TAP_USER	XCVR_TX_PRE_EMP_2ND_POST_TAP
1 to 15	-15 to -1
17 to 31	1 to 15
0 and 16	0