Would the bit pattern for these two fields ever be different? If so, why?
Thanks for your question!
SUBTRACT_x and REVERSE_INTG_x work together to achieve the integrator chopping where SUBTRACT_x is a math operation and REVERSE_INTG_x is a physical connection change by the switch matrix in front of the integrator.
Assuming s denotes the signal and n is the integrator noise per pulse, the integrator outputs s+n without REVERSE_INTG_x being set and the integrator output -s+n when REVERSE_INTG_x is set. To keep the signal and cancel the noise, a subtraction operation is applied so that (s+n) -(-s+n) = 2s.
For 4-pulse sequence, [0x010D]0x0066 will flip the integrator polarity for 2nd and 3rd pulses and apply subtraction to these two pulses and the result will be 4s. With [0x010D]0x0096 or [0x010D]0x0069, the result will be -4s.
Hope the example above helps.