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RTL8211FD-CG Datasheet(PDF) 38 Page - Realtek Semiconductor Corp. |
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RTL8211FD-CG Datasheet(HTML) 38 Page - Realtek Semiconductor Corp. |
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38 / 72 page  RTL8211F(I)/RTL8211FD(I) Datasheet Integrated 10/100/1000M Ethernet Transceiver 31 Track ID: JATR-8275-15 Rev. 1.1 Bit Name Type Default Description 0.13 Speed[0] RW 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 1 1 Reserved 1 0 1000Mbps 0 1 100Mbps 0 0 10Mbps 0.12 ANE RW 1 Auto-Negotiation Enable. 1: Enable Auto-Negotiation 0: Disable Auto-Negotiation 0.11 PWD RW 0 Power Down. 1: Power down (only Management Interface and logic are active; link is down) 0: Normal operation 0.10 Isolate RW 0 Isolate. 1: RGMII interface is isolated; the serial management interface (MDC, MDIO) is still active. When this bit is asserted, the RTL8211F(I)/RTL8211FD(I) ignores TXD[3:0], and TXCTL inputs, and presents a high impedance on TXC, RXC, RXCTL, RXD[3:0]. 0: Normal operation 0.9 Restart_AN RW, SC 0 Restart Auto-Negotiation. 1: Restart Auto-Negotiation 0: Normal operation 0.8 Duplex RW 1 Duplex Mode. 1: Full Duplex operation 0: Half Duplex operation This bit is valid only in force mode, i.e., NWay is disabled. 0.7 Collision Test RW 0 Collision Test. 1: Collision test enabled 0: Normal operation 0.6 Speed[1] RW 1 Speed Select Bit 1. Refer to bit 0.13. 0.5 Uni-directional enable RW 0 Uni-Directional Enable 1: Enable packet transmit without respect to linkok status 0: Packet transmit permitted when link is established 0.4:0 RSVD RO 00000 Reserved. Note 1: When the RTL8211F(I)/RTL8211FD(I) is switched from power down to normal operation, a software reset and restart auto-negotiation is performed, even if bits Reset (0.15) and Restart_AN (0.9) are not set by the user. Note 2: Auto-Negotiation is enabled when speed is set to 1000Base-T. Crossover Detection & Auto-Correction takes precedence over Auto-Negotiation disable (0.12=0). If ANE is disabled, speed and duplex capabilities are advertised by 0.13, 0.6, and 0.8. Otherwise, register 4.8:5 and 9.9:8 take effect. Note 3: Auto-Negotiation automatically restarts after hardware or software reset regardless of whether or not the restart bit (0.9) is set. |
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