SPRUII0F May 2019 – June 2024 TMS320F28384D , TMS320F28384D-Q1 , TMS320F28384S , TMS320F28384S-Q1 , TMS320F28386D , TMS320F28386D-Q1 , TMS320F28386S , TMS320F28386S-Q1 , TMS320F28388D , TMS320F28388S
Table 43-59 describes the read format of the RDES1 Normal Descriptor.
Bit | Name | Description |
---|---|---|
31-0 | BUF1AP | RDES0 Normal Descriptor (Read Format) |
When the SPH bit of Control register of a channel is reset, these bits indicate the physical address of Buffer 1. When the SPH bit is set, these bits indicate the physical address of Header Buffer where the Rx DMA writes the L2/L3/L4 header bytes of the received packet. | ||
The application can program a byte-aligned address for this buffer which means that the LS bits of this field can be non-zero. However, while transferring the start of packet, the DMA performs a Write operation with RDES0[1:0] as zero. However, the packet data is shifted as per actual offset as given by buffer address pointer. | ||
If the address pointer points to a buffer where the middle or last part of the packet is stored, the DMA ignores the offset address and writes to the full location as indicated by the data-width. |