Datasheet

447

SAM7X Series [DATASHEET]

6120K–ATARM–11-Feb-14

34.6.1 UDP Frame Number Register

Access Type: Read-only

• FRM_NUM[10:0]: Frame Number as Defined in the Packet Field Formats

This 11-bit value is incremented by the host on a per frame basis. This value is updated at each start of frame.

Value Updated at the SOF_EOP (Start of Frame End of Packet).

• FRM_ERR: Frame Error

This bit is set at SOF_EOP when the SOF packet is received containing an error.

This bit is reset upon receipt of SOF_PID.

• FRM_OK: Frame OK

This bit is set at SOF_EOP when the SOF packet is received without any error.

This bit is reset upon receipt of SOF_PID (Packet Identification).

In the Interrupt Status Register, the SOF interrupt is updated upon receiving SOF_PID. This bit is set without waiting for EOP.

Note: In the 8-bit Register Interface, FRM_OK is bit 4 of FRM_NUM_H and FRM_ERR is bit 3 of FRM_NUM_L.

31 30 29 28 27 26 25 24

--- --- --- --- --- --- --- ---

23 22 21 20 19 18 17 16

––––––FRM_OKFRM_ERR

15 14 13 12 11 10 9 8

––––– FRM_NUM

76543210

FRM_NUM