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VSC8221 数据表(PDF) 40 Page - Microsemi Corporation |
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VSC8221 数据表(HTML) 40 Page - Microsemi Corporation |
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40 / 138 page  VSC8221 Data Sheet VMDS-10106 Revision 4.1 December 2006 40 of 40 40 Figure 13. MDiO Write Frame 12.3 SMi interrupt The SMi includes an output signal MDiNT for signaling the Station Manager when certain events occur in the PHY. The MDiNT pin can be configured for active-low or active-high operation by tying the pin to either a pull-up resistor to VDDiOMiCRO or to a pull-down resistor to GND. Figure 14. Logical Representation of MDiNT Pin MDC MDIO Preamble (optional) SFD 1 Z1 0 Write 01 PHY Address A4 A3 A2 A1 A0 R4 R3 R2 R1 R0 Register Address to PHY 10 TA Register Data from PHY D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Z Z Idle Idle Z Station Manager Drives MDIO (PHY tristates MDIO during entire sequence) MDINT (to Station Manager) Interrupt Enable (Register 25.15) PHY Interrupt Status (Register 26.15) 4.7k-10k External Pull-up at Station Manager VDDIOMICRO VSC8221 MDINT 4.7k-10k External Pull-down at Station Manager |
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