at75c220 ATMEL Corporation, at75c220 Datasheet - Page 38

• Manufacturer Part Number: at75c220
• Description: Smart Internet Appliance Processor Siap
• Manufacturer: ATMEL Corporation

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MAC Network Configuration Register
Register Name: ETH_CFG
Access Type: Read/write
Reset Value: 0x8
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38
MPE
CSR
ISR
WES
BP
SPD
FD
BR
CAF
NBC
MTI
UNI
Management port enable. Set to one to enable the management port. When zero forces MDIO to high impedance
state.
Clear statistics registers. This bit is write-only. Writing a one clears the statistics registers.
Increment statistics registers. This bit is write-only. Writing a one increments all the statistics registers by one for test
purposes.
Write enable for statistics registers. Setting this bit to one makes the statistics registers writable for functional test
purposes.
Back pressure. If this field is set, then in half-duplex mode collisions are forced on all received frames by transmitting
64 bits of data (default pattern).
Speed. Set to 1 to indicate 100Mbit/sec. operation, 0 for 10Mbit/sec. Has no other functional effect.
Full duplex. If set to 1, the transmit block ignores the state of collision and carrier sense and allows receive while
transmitting.
Bit rate. Optional.
Copy all frames. When set to 1, all valid frames will be received.
No broadcast. When set to 1, frames addressed to the broadcast address of all ones will not be received.
Multicast hash enable, when set multicast frames will be received when six bits of the CRC of the destination address
point to a bit that is set in the hash register.
Unicast hash enable. When set, unicast frames will be received when six bits of the CRC of the destination address
point to a bit that is set in the hash register.
UNI
31
23
15
–
–
–
7
MTI
30
22
14
–
–
–
6
AT75C220
NBC
29
21
13
–
–
–
5
RTY
CAF
28
20
12
–
–
4
27
19
11
–
–
3
–
CLK
BR
26
18
10
–
–
2
EAE
FD
25
17
–
–
9
1
SPD
BIG
24
16
–
–
8
0