at91sam9g20-cu ATMEL Corporation, at91sam9g20-cu Datasheet - Page 664

• Manufacturer Part Number: at91sam9g20-cu
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

36.5.26.11
Register Name:
Access Type:
• 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.
36.5.26.12
Register Name:
Access Type:
• 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.
664
31
23
15
31
23
15
–
–
–
7
–
–
–
7
AT91SAM9G20 Preliminary
Transmit Underrun Errors Register
Carrier Sense Errors Register
30
22
14
30
22
14
EMAC_TUND
Read-write
–
–
–
6
EMAC_CSE
Read-write
–
–
–
6
29
21
13
29
21
13
–
–
–
5
–
–
–
5
28
20
12
28
20
12
–
–
–
4
–
–
–
4
TUND
CSE
27
19
11
27
19
11
–
–
–
3
–
–
–
3
26
18
10
26
18
10
–
–
–
2
–
–
–
2
25
17
25
17
–
–
9
–
1
–
–
9
–
1
6384B–ATARM–15-Dec-08
24
16
24
16
–
–
8
–
0
–
–
8
–
0