Rainbow Electronics AT91CAP9S250A - Manual (Page 877)

877
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
44.5.2 UDPHS Frame Number Register
Name: UDPHS_FNUM
Access Type: Read
• MICRO_FRAME_NUM: Microframe Number
Number of the received microframe (0 to 7) in one frame.This field is reset at the beginning of each new frame (1 ms).
One microframe is received each 125 microseconds (1 ms/8).
• FRAME_NUMBER: Frame Number as defined in the Packet Field Formats
This field is provided in the last received SOF packet (see INT_SOF in the UDPHS Interrupt Status Register ).
• FNUM_ERR: Frame Number CRC Error
This bit is set by hardware when a corrupted Frame Number in Start of Frame packet (or Micro SOF) is received.
This bit and the INT_SOF (or MICRO_SOF) interrupt are updated at the same time.
31 30 29 28 27 26 25 24
FNUM_ERR – – – – – – –
23 22 21 20 19 18 17 16
– – – – – – – –
15 14 13 12 11 10 9 8
– – FRAME_NUMBER
7 6 5 4 3 2 1 0
FRAME_NUMBER MICRO_FRAME_NUM