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LAN8710A Datasheet(PDF) 34 Page - Microchip Technology |
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LAN8710A Datasheet(HTML) 34 Page - Microchip Technology |
34 / 82 page Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology Datasheet Revision 1.4 (08-23-12) 34 SMSC LAN8710A/LAN8710Ai DATASHEET 3.6 Interrupt Management The device management interface supports an interrupt capability that is not a part of the IEEE 802.3 specification. This interrupt capability generates an active low asynchronous interrupt signal on the nINT output whenever certain events are detected as setup by the Interrupt Mask Register. The device’s interrupt system provides two modes, a Primary Interrupt mode and an Alternative interrupt mode. Both systems will assert the nINT pin low when the corresponding mask bit is set. These modes differ only in how they de-assert the nINT interrupt output. These modes are detailed in the following subsections. Note: The Primary interrupt mode is the default interrupt mode after a power-up or hard reset. The Alternative interrupt mode requires setup after a power-up or hard reset. 3.6.1 Primary Interrupt System The Primary interrupt system is the default interrupt mode (ALTINT bit of the Mode Control/Status Register is “0”). The Primary interrupt system is always selected after power-up or hard reset. In this mode, to set an interrupt, set the corresponding mask bit in the Interrupt Mask Register (see Table 3.3). Then when the event to assert nINT is true, the nINT output will be asserted. When the corresponding event to deassert nINT is true, then the nINT will be de-asserted. Note 3.3 If the mask bit is enabled and nINT has been de-asserted while ENERGYON is still high, nINT will assert for 256 ms, approximately one second after ENERGYON goes low when the Cable is unplugged. To prevent an unexpected assertion of nINT, the ENERGYON interrupt mask should always be cleared as part of the ENERGYON interrupt service routine. Table 3.3 Interrupt Management Table MASK INTERRUPT SOURCE FLAG INTERRUPT SOURCE EVENT TO ASSERT nINT EVENT TO DE-ASSERT nINT 30.7 29.7 ENERGYON 17.1 ENERGYON Rising 17.1 (Note 3.3) Falling 17.1 or Reading register 29 30.6 29.6 Auto-Negotiation complete 1.5 Auto-Negotiate Complete Rising 1.5 Falling 1.5 or Reading register 29 30.5 29.5 Remote Fault Detected 1.4 Remote Fault Rising 1.4 Falling 1.4, or Reading register 1 or Reading register 29 30.4 29.4 Link Down 1.2 Link Status Falling 1.2 Reading register 1 or Reading register 29 30.3 29.3 Auto-Negotiation LP Acknowledge 5.14 Acknowledge Rising 5.14 Falling 5.14 or Read register 29 30.2 29.2 Parallel Detection Fault 6.4 Parallel Detection Fault Rising 6.4 Falling 6.4 or Reading register 6, or Reading register 29 or Re-Auto Negotiate or Link down 30.1 29.1 Auto-Negotiation Page Received 6.1 Page Received Rising 6.1 Falling of 6.1 or Reading register 6, or Reading register 29 Re-Auto Negotiate, or Link Down. |
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