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AM79C940JC/W Datasheet(PDF) 29 Page - Advanced Micro Devices

Part # AM79C940JC/W
Description  Media Access Controller for Ethernet (MACE??
PDF  144 Pages
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Manufacturer  AMD [Advanced Micro Devices]
Direct Link  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C940JC/W Datasheet(HTML) 29 Page - Advanced Micro Devices

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Am79C940
29
FIFO. In general, there are ways to ensure that a
transfer is always valid; so this pin is not required in
many designs. For instance, the TDTREQ and
RDTREQ pins can be used to monitor the state of the
FIFOs to ensure that data transfer only occurs at the
correct times.
RXPOL
RXPOL is typically used to drive an LED indicating the
polarity of receive frames. This function is not
necessary for correct operation of the Ethernet and
serves strictly as a status indication to a user. The sta-
tus of the receive polarity is still available through the
PHYCC register.



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