This document describes the external port DMA modes of operation supported on SHARC® processors, including DMA mode, trigger mode and read/write mode. All described modes are supported on ADSP-2106x and ADSP-2116x processors. The ADSP-21367, ADSP-21368, ADSP-21369 (hereafter referred to as ADSP-21368 processors), and ADSP-2137x processors external port supports master mode DMA operation only. These processors do not have the extra logic to support slave mode and read/write mode.