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ATSAM4S-XPLD
945
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
39.7.1 UDP Frame Number Register
Name:
UDP_FRM_NUM
Address:
0x40034000
Access:
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
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23
22
21
20
19
18
17
16
–
–
–
–
–
–
FRM_OK
FRM_ERR
15
14
13
12
11
10
9
8
–
–
–
–
–
FRM_NUM
7
6
5
4
3
2
1
0
FRM_NUM