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COM20019I-HD Datasheet(PDF) 9 Page - SMSC Corporation |
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COM20019I-HD Datasheet(HTML) 9 Page - SMSC Corporation |
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9 / 65 page  Low Cost ARCNET (ANSI 878.1) Controller with 2K x 8 On-Board RAM SMSC COM20019I Page 9 Rev. 04-15-05 DATASHEET PLCC PIN NO. NAME SYMBOL DESCRIPTION TRANSMISSION MEDIA INTERFACE 19,18 nPulse 2, nPulse 1 nPULSE2, nPULSE1 Output (nPULSE1), Input/Output (nPULSE2). In Normal Mode, these active low signals carry the transmit data information, encoded in pulse format, as DIPULSE waveform. When the device is in Backplane Mode, the nPULSE1 signal driver is programmable (push/pull or open-drain), while the nPULSE2 signal provides a clock with frequency of double the data rate. nPULSE1 is connected to a weak internal pull-up resistor on the open/drain driver in backplane mode. The COM20019I does not support the Normal Mode. Use only in the Backplane Mode. 20 Receive In RXIN Input. This signal carries the receive data information from the line transceiver. 21 nTransmit nEnable nTXEN Output. This signal is used prior to the Power- up to enable the line drivers for transmission. The polarity of the signal is programmable through the nPULSE2 pin. nPULSE2 floating before Power-up: nTXEN active low (Default option) nPULSE2 grounded before Power-up: nTXEN active high (This option is only available in Backplane Mode) 16,17 Crystal Oscillator XTAL1, XTAL2 An external crystal should be connected to these pins. Oscillation frequency range is from 10 to 20 MHz. If an external TTL clock is used instead, it must be connected to XTAL1 with a 390 pull-up resistor, and XTAL2 should be left floating. 15,28 Power Supply VDD +5 Volt Power Supply pin. 7,14,22 Ground VSS Ground pin. |
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