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ICS1894-40 Datasheet(PDF) 11 Page - Integrated Device Technology |
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ICS1894-40 Datasheet(HTML) 11 Page - Integrated Device Technology |
11 / 52 page ICS1894-40 10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE PHYCEIVER IDT™ / ICS™ 10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE 11 ICS1894-40 REV C 092909 Auto-MDI/MDIX Crossover The ICS1894-40 includes the auto-MDI/MDIX crossover feature. In a typical CAT 5 Ethernet installation the transmit twisted pair signal pins of the RJ45 connector are crossed over in the CAT 5 wiring to the partners receive twisted pair signal pins and receive twisted pair to the partners transmit twisted pair. This is usually accomplished in the wiring plant. Hubs generally wire the RJ45 connector crossed to accomplish the crossover. Two types of CAT 5 cables (straight and crossed) are available to achieve the correct connection. The Auto-MDI/MDIX feature automatically corrects for miss-wired installations by automatically swapping transmit and receive signal pairs at the PHY when no link results. Auto-MDI/MDIX is automatic, but may be disabled for test purposes by writing MDIO register 19 Bits 9:8 in the MDIO register. The Auto-MDI/MDIX function is independent of Auto-Negotiation and preceeds Auto-Negotiation when enabled. Power Management Clock Reference Interface The REF_IN pin provides the ICS1894-40 Clock Reference Interface. The ICS1894-40 requires a single clock reference with a frequency of 25 MHz ±50 parts per million. This accuracy is necessary to meet the interface requirements of the ISO/IEEE 8802-3 standard, specifically clauses 22.2.2.1 and 24.2.3.4. The ICS1894-40 supports two clock source configurations: a CMOS oscillator or a CMOS driver. The input to REF_IN is CMOS (10% to 90% VDD), not TTL. Alternately, a 25MHz crystal may be used. |
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