RTL8211C & RTL8211CL
Datasheet
7.2. Register Table
7.2.1. BMCR (Basic Mode Control Register, Address 0x00)
Table 21. BMCR (Basic Mode Control Register, Address 0x00)
Bit
Name
RW
RW, SC1
Default Description
0.15
Reset
0
Reset.
1: PHY reset
0: Normal operation
Loopback Mode for 10M &100M.
1: Enable loopback mode
0: Disable loopback mode
0.14
0.13
Loopback
Speed[0]
RW
RW
0
The loopback function enables RGMII transmit data to be routed to the
RGMII receive data path.
0
Speed Select bit 0.
In forced mode, i.e. when Auto-Negotiation is disabled, bits 6 and 13
determine device speed selection.
Speed[1]
Speed[0]
Speed Enabled
Reserved
1
1
0
0
1
0
1
0
1000Mbps
100Mbps
10Mbps
0.12
0.11
0.10
ANE
RW
RW
RW
1
0
0
Auto-Negotiation Enable.
1: Enable Auto-Negotiation
0: Disable Auto-Negotiation
Power Down.
PWD
Isolate
1: Power down (only Management Interface and logic active, link is down)
0: Normal operation
Isolate.
1: RGMII interface is isolated; the serial management interface (MDC,
MDIO) is still active. When this bit is asserted, the RTL8211C(L) ignores
TXD[3:0], and TXCLT inputs, and presents a high impedance on TXC,
RXC, RXCLT, RXD[3:0].
0: Normal operation
0.9
0.8
Restart_AN
Duplex
RW, SC
RW
0
1
Restart Auto-Negotiation.
1: Restart Auto-Negotiation
0: Normal operation
Duplex Mode.
1: Full Duplex operation
0: Half Duplex operation
This bit is valid only in force mode, i.e., NWay is disabled.
Integrated 10/100/1000 Gigabit Ethernet Transceiver
23
Track ID: JATR-1076-21 Rev. 1.3
ETC [ ETC ]
