Texas Instruments TMS320C67X/C67X+ DSP - Manual (Page 317)

Subtract Using Word Addressing Mode SUBAW
3-257 Instruction Set SPRU733
Example SUBAW .D1 A5,2,A3
Before instruction 1 cycle after instruction
A3 xxxx xxxxh A3 0000 0108h
A5 0000 0100h A5 0000 0100h
AMR 0003 0004h AMR 0003 0004h
BK0 = 3 → size = 16
A5 in circular addressing mode using BK0