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83C694 Datasheet(PDF) 15 Page - List of Unclassifed Manufacturers |
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83C694 Datasheet(HTML) 15 Page - List of Unclassifed Manufacturers |
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15 / 33 page  PIN NUMBER MNEMONIC SIGNAL NAME I/O DESCRIPTION 16 LBK Loopback I A high level enables loopback of TXD to RXD/RXC. A low level enables normal trans- mit/receive operation. The LBK pin includes an internal pull-down resistor, so it may be left open if unused. 17 X1 Crystal/Ext. Input I X1 is driven by an external clock frequency source or is connected to one terminal of the 20MHz crystal. The IEEE 802.3 standard requires 0.01% ab- solute accuracy on the transmitted signal fre- quency. Stray capacitance can shift the crystal’s frequency out of range, causing it to exceed the 0.01% tolerance. To remedy this, extra load capacitance may be added. To determine the amount of capacitance to add, measure the board capacitance and the capacitance between the X1 and X2 pins. Then add these values together, and subtract them from the crystal’s required load capaci- tance. (Refer to Figure 2-1.) 18 X2 Crystal Feedback O This output is connected to the other terminal of the 20MHz crystal. If X1 is driven with an external source, X2 must be left open. 19 TXD Transmit Data I TXD is sampled on the rising edge of TXC when TXE is high. The NRZ data input here is encoded and transmitted on TX+/TX- or TPX+/TPX- as a differential signal. 20 TXC Transmit Clock O This is a 10MHz clock signal derived from the internal 20MHz oscillator. It is enabled except when RES is low and MPE is high. 21 TXE Transmit Enable I TXE enables encoding and transmission of the data input via TXD. It is sampled on the rising edge of TXC. 22 TPX2- TwPr Transmit O TPX2- is used for 10BaseT only. It is the low current negative output pin. See TPX1+ for details. 23 TPX1- TwPr Transmit O TPX1- is used for 10BaseT only. It is the high current negative output pin. See TPX1+ for details. TABLE 3-1. PIN DESCRIPTION cont. 83C694D PIN DESCRIPTION 12 |
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