How to read time TCRR from DSP on DM814x

Section 23.3.10 of sprugz8c.pdf (TRM) states:

"So, to read the value of TCRR correctly, the first OCP read access has to be to the lower 16-bit
(offset = 28h), followed by OCP read access to the upper 16-bit (offset = 2Ah)"

Where do these 16-bit offsets magically come from? Are they in a table somewhere? Are they even correct?

Thanks,

Andrew