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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LXT970ATC датащи(PDF) 26 Page - Intel Corporation |
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LXT970ATC датащи(HTML) 26 Page - Intel Corporation |
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26 / 74 page  LXT970A — Dual-Speed Fast Ethernet Transceiver 26 Datasheet 2.2.4 Hardware Control Interface The Hardware Control Interface consists of MF<4:0>, CFG <1:0> and FDE input pins. This interface is used to configure operating characteristics of the LXT970A and to determine the MDIO Address. When MDDIS is Low, the Hardware Control Interface provides initial values for the MDIO registers, and then passes control to the MDIO Interface. When MDDIS is High, the Hardware Control Interface provides continuous control over the LXT970A. Individual chip addressing allows multiple LXT970A devices to share the MII in either mode. Table 12, Table 13 and Table 14 show how to set up the desired operating configurations using the Hardware Control Interface. . Table 12. Configuring the LXT970A via Hardware Control Desired Configuration Pin Name Voltage Level MDIO Registers Auto-Negotiation Enabled1 MF0 VMF2, VMF30.12 = 1 Auto-Negotiation Disabled2 MF0 VMF1, VMF40.12 = 0 Normal Operation (DTE Mode, Nibble Mode, Scrambler Enabled) MF1 MF2 MF3 VMF1, VMF4 19.13 = 0 19.4 = 0 19.3 = 0 Repeater Mode MF1 VMF2, VMF3 19.13 = 1 Symbol Mode MF2 VMF2, VMF3 19.4 = 1 Scrambler Bypass Mode MF3 VMF2, VMF3 19.3 = 1 1. Refer to Table 13 for Hardware Control Interface functions available when auto-negotiation is enabled. 2. Refer to Table 14 for Hardware Control Interface functions available when auto-negotiation is disabled. Table 13. LXT970A Operating Configurations / Auto-Negotiation Enabled Desired Configuration1,2 Input Value MDIO Registers MF4 CFG1 FDE 4.5 4.6 4.7 4.8 Advertise All VMF1, VMF4 Low Ignore 1 1 1 1 Advertise 100 HD VMF2, VMF3 Low Low 00 10 Advertise 100 HD/FD VMF2, VMF3 Low High 0 0 1 1 Advertise 10 HD VMF1, VMF4 High Low 10 00 Advertise 10 HD/FD VMF1, VMF4 High High 1 1 0 0 Advertise 10/100 HD VMF2, VMF3 High Low 10 10 Advertise 10/100 HD/FD VMF2, VMF3 High High 1 1 1 1 1. Refer to Table 12 for basic configurations. 2. Refer to Table 14 for Hardware Control Interface functions available when auto-negotiation is disabled. |
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