Ken, I responded to your e-mail, but for archive purposes....
Byte swap wasn't an issue. 16 bit words are still 16 bit as far as speed reference, speed feedback, etc. Even though TI swaps the order of bits (16 to 1 vs 0 to 15) it doesn't affect word transfers. 32727 written to the WY is still full speed. The status and command bits are reversed however, so a stop command is bit 16 and a start command bit 15 (instead of 0 and 1). To make it easy for the customer who was used to writing whole words to their MM440's, we just write a value of 17 to the command word to stop, 18 to run forward and 34 to run reverse. Or do it via individual bits, just remember to swap the order (16 to 1 = 0 to 15)