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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LAN9730 데이터시트(PDF) 83 Page - Microchip Technology |
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LAN9730 데이터시트(HTML) 83 Page - Microchip Technology |
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83 / 222 page  2012-2015 Microchip Technology Inc. DS00001946A-page 83 LAN9730/LAN9730i 4.6.6.3 Half vs. Full-Duplex Half-duplex operation relies on the CSMA/CD (Carrier Sense Multiple Access/Collision Detect) protocol to handle net- work traffic and collisions. In this mode, the internal carrier sense signal, CRS, responds to both transmit and receive activity. In this mode, if data is received while the PHY is transmitting, a collision results. In full-duplex mode, the PHY is able to transmit and receive data simultaneously. In this mode, the internal CRS responds only to receive activity. The CSMA/CD protocol does not apply and collision detection is disabled. Table 4-55 describes the behavior of the internal CRS bit under all receive/transmit conditions. The internal CRS signal is used to trigger bit 10 (No Carrier) of the TX Status Word (see Section 4.4.2.6, "TX Status Format"). The CRS value, and subsequently the No Carrier value, are invalid during any full-duplex transmission. There- fore, these signals cannot be used as a verification method of transmitted packets when transmitting in 10/100 Mbps full-duplex modes. Note 4-25 The device’s 10/100 PHY internal CRS signal operates in two modes: Active and Low. When in Active mode, the internal CRS will transition high and low upon line activity, where a high value indicates a carrier has been detected. In Low mode, the internal CRS stays low and does not indicate carrier detection. The internal CRS signal and No Carrier (bit 10 of the TX Status Word) cannot be used as a verification method of transmitted packets when transmitting in 10/100 Mbps full-duplex mode. TABLE 4-55: CRS BEHAVIOR Mode Speed Duplex Activity CRS Behavior Note 4-25 Manual 10 Mbps Half-Duplex Transmitting Active Manual 10 Mbps Half-Duplex Receiving Active Manual 10 Mbps Full-Duplex Transmitting Low Manual 10 Mbps Full-Duplex Receiving Active Manual 100 Mbps Half-Duplex Transmitting Active Manual 100 Mbps Half-Duplex Receiving Active Manual 100 Mbps Full-Duplex Transmitting Low Manual 100 Mbps Full-Duplex Receiving Active Auto-Negotiation 10 Mbps Half-Duplex Transmitting Active Auto-Negotiation 10 Mbps Half-Duplex Receiving Active Auto-Negotiation 10 Mbps Full-Duplex Transmitting Low Auto-Negotiation 10 Mbps Full-Duplex Receiving Active Auto-Negotiation 100 Mbps Half-Duplex Transmitting Active Auto-Negotiation 100 Mbps Half-Duplex Receiving Active Auto-Negotiation 100 Mbps Full-Duplex Transmitting Low Auto-Negotiation 100 Mbps Full-Duplex Receiving Active |
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