Datasheet

589
6120F–ATARM–03-Oct-06
AT91SAM7X512/256/128 Preliminary
37.5.26.11 Transmit Underrun Errors Register
Register Name: EMAC_TUND
Access Type: Read/Write
• TUND: Transmit Underruns
An 8-bit register counting the number of frames not transmitted due to a transmit DMA underrun. If this register is incre-
mented, then no other statistics register is incremented.
37.5.26.12 Carrier Sense Errors Register
Register Name: EMAC_CSE
Access Type: Read/Write
• CSE: Carrier Sense Errors
An 8-bit register counting the number of frames transmitted where carrier sense was not seen during transmission or where
carrier sense was deasserted after being asserted in a transmit frame without collision (no underrun). Only incremented in
half-duplex mode. The only effect of a carrier sense error is to increment this register. The behavior of the other statistics
registers is unaffected by the detection of a carrier sense error.
31 30 29 28 27 26 25 24
––––––––
23 22 21 20 19 18 17 16
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15 14 13 12 11 10 9 8
––––––––
76543210
TUND
31 30 29 28 27 26 25 24
––––––––
23 22 21 20 19 18 17 16
––––––––
15 14 13 12 11 10 9 8
––––––––
76543210
CSE