SWD protocol : In the document (CoreSight components trm): ARM DDI 0314H, page 2-20,Fig 2-10, how RD[1] came to DAP bus before it could come at AHB bus? Can you please explain the read timing diagram in detail.

My question is related to Serial Wire Debug protocol.

1. SWD protocol : In the document (CoreSight components trm): ARM DDI 0314H, page 2-20,Fig 2-10, how RD[1] came to DAP bus before it could come at AHB bus? Can you please explain the read timing diagram in detail.

2. To do a SWD read, do we need to send read request twice, as the first read data is discarded?