2 network configuration register – Rainbow Electronics AT91CAP9S250A User Manual
Page 810
810
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
42.5.2
Network Configuration Register
Register Name:
EMAC_NCFGR
Access Type:
Read/Write
• SPD: Speed
Set to 1 to indicate 100 Mbit/s operation, 0 for 10 Mbit/s. The value of this pin is reflected on the
speed
pin.
• FD: Full Duplex
If set to 1, the transmit block ignores the state of collision and carrier sense and allows receive while transmitting. Also con-
trols the
half_duplex
pin.
• CAF: Copy All Frames
When set to 1, all valid frames are received.
• JFRAME: Jumbo Frames
Set to one to enable jumbo frames of up to 10240 bytes to be accepted.
• NBC: No Broadcast
When set to 1, frames addressed to the broadcast address of all ones are not received.
• MTI: Multicast Hash Enable
When set, multicast frames are received when the 6-bit hash function of the destination address points to a bit that is set in
the hash register.
• UNI: Unicast Hash Enable
When set, unicast frames are received when the 6-bit hash function of the destination address points to a bit that is set in
the hash register.
• BIG: Receive 1536 bytes frames
Setting this bit means the EMAC receives frames up to 1536 bytes in length. Normally, the EMAC would reject any frame
above 1518 bytes.
31
30
29
28
27
26
25
24
–
–
–
–
–
–
–
–
23
22
21
20
19
18
17
16
–
–
–
–
IRXFCS
EFRHD
DRFCS
RLCE
15
14
13
12
11
10
9
8
RBOF
PAE
RTY
CLK
–
BIG
7
6
5
4
3
2
1
0
UNI
MTI
NBC
CAF
JFRAME
–
FD
SPD