Host DMA Channel x Address Register
| Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
| BUFF_ADD[31:24] | |||||||||
| Access | |||||||||
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
| BUFF_ADD[23:16] | |||||||||
| Access | |||||||||
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| BUFF_ADD[15:8] | |||||||||
| Access | |||||||||
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| BUFF_ADD[7:0] | |||||||||
| Access | |||||||||
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
Buffer Address
This field determines the AHB bus starting address of a DMA channel transfer.
Channel start and end addresses may be aligned on any byte boundary.
The firmware can write this field only when the USBHS_HSTDMASTATUS.CHANN_ENB bit is cleared.
This field is updated at the end of the address phase of the current access to the AHB bus. It is incremented by the access byte width. The access width is 4 bytes (or less) at packet start or end, if the start or end address is not aligned on a word boundary.
The packet start address is either the channel start address or the next channel address to be accessed in the channel buffer.
The packet end address is either the channel end address or the latest channel address accessed in the channel buffer.
The channel start address is written by software or loaded from the descriptor. The channel end address is either determined by the end of buffer or the USB device, or by the USB end of transfer if the USBHS_HSTDMACONTROLx.END_TR_EN bit is set.