AM79C873 Advanced Micro Devices, AM79C873 Datasheet - Page 21

• Manufacturer Part Number: AM79C873
• Description: NetPHY -1 10/100 Mbps Ethernet Physical Layer Single-Chip Transceiver with 100BASE-FX Support
• Manufacturer: Advanced Micro Devices

Basic Mode Control Register (BMCR) -
Register 0 (Continued)
Bit
0.9
0.8
0.7
0.6
Restart Auto-
Duplex Mode
Collision Test
Negotiation
Bit Name
Reserved
0, RW/SC
Default
1, RW
0, RW
0, RO
P R E L I M I N A R Y
Restart Auto-Negotiation:
1= Restart Auto-Negotiation.
0= Normal Operation
When this bit is set the Auto-Negotiation process is re-initiated. When
Auto-Negotiation is disabled (bit 12 of this register cleared), this bit has no
function and it should be cleared. This bit is self-clearing and will return a
value of 1 until Auto-Negotiation is initiated. The operation of the Auto-
Negotiation process will not be affected by the management entity that
clears this bit.
Duplex Mode:
1= Full Duplex operation.
0= Normal operation
If Auto-Negotiation is disabled, setting this bit will cause the NetPHY-1
device to operate in Full Duplex mode. When Auto-Negotiation is enabled,
this bit reflects the duplex selected by Auto-Negotiation.
Collision Test:
1= Collision Test enabled.
0= Normal Operation
When set, this bit will cause the COL signal to be asserted in response to
the assertion of TX_EN.
Reserved:
Write as 0, ignore on read.
Am79C873
Description
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