Trapezoid Rise Time:  Rise/Fall time of the trapezoid (expressed in sample periods). It acts as the shaping time of a traditional shaping amplifier.
This is the register DPP_TRAPEZOID_RISE_TIME (Trise)

Trapezoid Rise Time (0x1n5C (channel n), 0x805C (all channels, write only), R/W, )
Set the Trapezoid Rise Time width, i.e. the Trapezoid Shaping Time. 
Note: the sum of the Trapezoid Shaping Time and Trapezoid Flat Top (0x1n60) should not exceed 15 us times the Decimation value for 
x724 series, 8 us for x730 series.
Bit Description
[9:0] Trapezoid Rise Time value expressed in sampling clock unit (10 ns).
     This value corresponds to the trapezoid shaping time.
[31:10] Reserved