am79c940 Advanced Micro Devices, am79c940 Datasheet - Page 56
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am79c940
Manufacturer Part Number
am79c940
Description
Media Access Controller For Ethernet Mace
Manufacturer
Advanced Micro Devices
Datasheet
1.AM79C940.pdf
(122 pages)
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data without addition of an FCS field, and the FCS will be
calculated and verified at the receiver.
The loopback facilities of the MACE device allow full op-
eration to be verified without disturbance to the network.
Loopback operation is also affected by the state of the
Loopback Control bits (LOOP [0–1]) in the User Test
Register. This affects whether the internal MENDEC is
considered part of the internal or external loop-
back path.
56
AMD
Am79C940
When in the loopback mode(s), the multicast address
detection feature of the MACE device, programmed by
the contents of the Logical Address Filter (LADR [63–0])
can only be tested when RCVFCSE = 1, allocating the
CRC generator to the receiver. All other features
operate identically in loopback as in normal operation,
such as automatic transmit padding and receive
pad stripping.