COM20020_00 Datasheet, PDF (24/82 Pages) SMSC Corporation – Universal Local Area Network Controller with 2K x 8 On-Board RAM

Programmable TXEN Polarity
To accommodate transceivers with active high
ENABLE pins, the COM20020 contains a
programmable TXEN output. To program the
TXEN pin for an active high pulse, the nPULSE2
pin should be connected to ground. To retain the
normal active low polarity, nPULSE2 should be
left open. The polarity determination is made at
power on reset and is valid only for Backplane
Mode operation. The nPULSE2 pin should remain
grounded at all times if an active high polarity is
desired.
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