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LXT970ATC датащи(PDF) 46 Page - Intel Corporation |
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LXT970ATC датащи(HTML) 46 Page - Intel Corporation |
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46 / 74 page ![]() LXT970A — Dual-Speed Fast Ethernet Transceiver 46 Datasheet Figure 21. Typical Interface Circuitry LXT970A 25.0 MHz C1 C2 XI TX_EN TPIN TPIP RJ45 RBIAS GNDD TXD<4:0> TX_CLK TX_ER COL RX_DV RX_ER RX_CLK RXD<4:0> CRS MDIO FDS/MDINT MDC MII Data I/F +5 V VCCD XO TPON 50 Ω 1% TPOP 50 Ω 1% 50 Ω 50 Ω 50 Ω 75 Ω 50 Ω 50 Ω TREF VCCIO +3.3V or +5V GNDIO 50 Ω 6 5 4 3 2 1 8 7 VCCT GNDT FIBON 191 W FIBOP FIBIN FIBIP 191 W 69 W 69 W Fiber Txcvr .01 mF 130 W 130 W 80 W 80 W +5 V .01 mF TD TD RD RD 3 2 1 VCCA GNDA TEST LEDS LEDR LEDT LEDL LEDC 330 W 330 W 330 W 330 W 330 W +5 V 75 Ω VCCR GNDR .01 µF .01 µF MF<4:0> CFG<1:0> RESET PWRDWN H/W Control I/F FDE TRSTE MDDIS MII Control I/F .01 µF .01 µF 0.001 µF/2kV .01 µF.01µF 22.1k Ω 1% .01 µF .01 mF 10 µF GNDD GNDD GNDA GNDA GNDA GNDA VCCR GNDD VCCD Ferrite Bead +5 V 10 µF VCCA GNDA 10 µF + + 4 VCCT +5 V + .01 mF 50 Ω 1% 50 Ω 1% .01 µF GNDR 5 6 7 55 Ω 55 Ω 55 Ω 55 Ω 55 Ω 55 Ω 55 Ω 1. Refer to Table 19 and Table 20 for crystals. 2. Refer to Table 18 for magnetics. 3. Refer to fiber transceiver manufacturers recommendations for termination circuitry. Suitable fiber transceivers include: HFBR-5103 and HFBR-5105. 4. Bypassing to chassis ground (if available) provides additional EMI shielding. 5. If the fiber interface is not used, FIBIN, FIBIP, FIBON, and FIBOP may be left unconnected. 6. Placement of this cap should be verified for each application. This cap typically reduces error rates at long line lengths but is implementation specific. 7. If bit 17.3 = 0, series terminations resistors are recommended for all MII outputs. The proper value is application specific. If bit 17.3 = 1, termination resistors are not required. |
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