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RTL8211FD-CG Datasheet(PDF) 14 Page - Realtek Semiconductor Corp. |
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RTL8211FD-CG Datasheet(HTML) 14 Page - Realtek Semiconductor Corp. |
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14 / 72 page  RTL8211F(I)/RTL8211FD(I) Datasheet Integrated 10/100/1000M Ethernet Transceiver 7 Track ID: JATR-8275-15 Rev. 1.1 6. Pin Descriptions Some pins have multiple functions. Refer to the Pin Assignments figure on page 6 for a graphical representation. I: Input LI: Latched Input During Power up or Reset O: Output IO: Bi-Directional Input and Output P: Power PD: Internal Pull Down During Power On Reset PU: Internal Pull Up During Power On Reset OD: Open Drain G: Ground 6.1. Transceiver Interface Table 1. Transceiver Interface Pin No. Pin Name Type Description 1 MDIP0 IO 2 MDIN0 IO In MDI mode, this is the first pair in 1000Base-T, i.e., the BI_DA+/- pair, and is the transmit pair in 10Base-T and 100Base-TX. In MDI crossover mode, this pair acts as the BI_DB+/- pair, and is the receive pair in 10Base-T and 100Base-TX. 4 MDIP1 IO 5 MDIN1 IO In MDI mode, this is the second pair in 1000Base-T, i.e., the BI_DB+/- pair, and is the receive pair in 10Base-T and 100Base-TX. In MDI crossover mode, this pair acts as the BI_DA+/- pair, and is the transmit pair in 10Base-T and 100Base-TX. 6 MDIP2 IO 7 MDIN2 IO In MDI mode, this is the third pair in 1000Base-T, i.e., the BI_DC+/- pair. In MDI crossover mode, this pair acts as the BI_DD+/- pair. 9 MDIP3 IO 10 MDIN3 IO In MDI mode, this is the fourth pair in 1000Base-T, i.e., the BI_DD+/- pair. In MDI crossover mode, this pair acts as the BI_DC+/- pair. 6.2. Clock Table 2. Clock Pin No. Pin Name Type Description 36 XTAL_IN I 25MHz Crystal Input. Connect to GND if an external 25MHz oscillator drives XTAL_OUT/EXT_CLK. 37 XTAL_OUT/E XT_CLK O 25MHz Crystal Output. If a 25MHz oscillator is used, connect XTAL_OUT/EXT_CLK to the oscillator’s output (see section 10.3, page 58 for clock source specifications). 35 CLKOUT O 125/25MHz Reference Clock Generated from Internal PLL. This pin should be kept floating if this clock is not used by MAC. |
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