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AM79C874VC 数据表(PDF) 7 Page - Advanced Micro Devices

部件名 AM79C874VC
功能描述  NetPHY-1LP Low Power 10/100-TX/FX Ethernet Transceiver
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制造商  AMD [Advanced Micro Devices]
网页  http://www.amd.com
标志 AMD - Advanced Micro Devices

AM79C874VC 数据表(HTML) 7 Page - Advanced Micro Devices

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Am79C874
7
P R E L I M INARY
REGISTER DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Serial Management Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
MII Management Control Register (Register 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
MII Management Status Register (Register 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
PHY Identifier 1 Register (Register 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
PHY Identifier 2 Register (Register 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Auto-Negotiation Advertisement Register (Register 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Auto-Negotiation Link Partner Ability Register in Base Page Format (Register 5) . . . . . . . . 33
Auto-Negotiation Link Partner Ability Register in Next Page Format (Register 5) . . . . . . . . .33
Auto-Negotiation Expansion Register (Register 6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Auto-Negotiation Next Page Advertisement Register (Register 7) . . . . . . . . . . . . . . . . . . . . 35
Reserved Registers (Registers 8-15, 20, 22, 25-31) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Miscellaneous Features Register (Register 16) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Interrupt Control/Status Register (Register 17) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Diagnostic Register (Register 18) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Power/Loopback Register (Register 19) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Mode Control Register (Register 21). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Disconnect Counter Register (Register 23). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Receive Error Counter Register (Register 24). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
OPERATING RANGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Commercial (C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Industrial (I) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
DC CHARACTERISTICS41
SWITCHING WAVEFORMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Key to Switching Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
SWITCHING CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
System Clock Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
MLT-3 Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
MII Management Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
MII Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
100 Mbps MII Transmit Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
100 Mbps MII Receive Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
10 Mbps MII Transmit Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
10 Mbps MII Receive Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
GPSI Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
10 Mbps GPSI Receive Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
10 Mbps GPSI Receive Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
10 Mbps GPSI Collision Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
10 Mbps GPSI Transmit Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
10 Mbps GPSI Transmit Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
PHYSICAL DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
PQT80 (measured in millimeters) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
REVISION HISTORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
List of Figures
Figure 1.FXT± and FXR± Termination for 100BASE-FX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 2.MLT-3 Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 3.TX± and RX± Termination for 100BASE-TX and 10BASE-T. . . . . . . . . . . . . . . . . . . . . 21
Figure 5.Standard LED Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 6.Advanced LED Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 7.PHY Management Read and Write Operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 8.MLT-3 Receive Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Figure 9.MLT-3 and 10BASE-T Test Load with 1:1 Transformer Ratio. . . . . . . . . . . . . . . . . . . . . 44
Figure 10.MLT-3 and 10BASE-T Test Load with 1.25:1 Transformer Ratio . . . . . . . . . . . . . . . . . 44
Figure 11.Near-End 100BASE-TX Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Figure 12.10BASE-T Waveform With 1:1 Transformer Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45


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