SPRUII0F May 2019 – June 2024 TMS320F28384D , TMS320F28384D-Q1 , TMS320F28384S , TMS320F28384S-Q1 , TMS320F28386D , TMS320F28386D-Q1 , TMS320F28386S , TMS320F28386S-Q1 , TMS320F28388D , TMS320F28388S
Table 43-61 describes the read format of the RDES2 Normal Descriptor.
Bit | Name | Description |
---|---|---|
31-0 | BUF1AP | Buffer 2 Address Pointer |
These bits indicate the physical address of Buffer 2. | ||
When the SPH bit of the DMA_CH#_Control register is set, the buffer address pointer must be bus width-aligned, that is, RDES2[3:0, 2:0, or 1:0] = 0 corresponding to 128, 64, or 32 bus width. LSBs are ignored internally. | ||
When the SPH bit of the DMA_CH#_Control register is reset, there is no limitations on the RDES2 value. However, the RxDMA uses the LS Bits of the pointer address only while transferring the start bytes of a packet. If the BUF2AP is giving the address of a buffer in which the middle or last part of a packet is stored, the DMA ignores BUF2AP[3:0 or 2:0 or 1:0] (corresponding to 128-, 64-, or 32-bit data-bus) and writes to the complete location. |