MB86960 Datasheet, PDF (42/65 Pages) Fujitsu Component Limited. – NETWORK INTERFACE CONTROLLER with ENCODER/DECODER (NICE)

MB86960
Network Management
Error, traffic and performance statistics can be collected
continuously or on a sampled basis. The Receive Status
Register and Transmit Status Register indicate any errors
detected. Such data can be collected in two ways. Either
interrupts can be used after each packet, and the status
read from the status register by the interrupt service
routine, or, for the receive case, the packets can be
accepted for storage in the receive buffer, allowing their
contents and error statuses (stored in the header) to be read
later in batch mode. To get maximum statistics for the
network, the “Accept all packets” mode can be used. In
this mode, all packets can be counted, including their
lengths. But of course, this use will maximize host
overhead, so it should be used sparingly in user terminal
equipment.
Carrier detection can be sampled as a means of estimating
network bandwidth utilization. This bit is available in the
Transmit Status Register (NET BSY).
An estimate of the average media-access waiting time can
be calculated from the elapsed time between starting the
Transmitter and TX DONE going high.
The transmit collision count (DLCR4<7:4>) can be used
to determine the number of collisions encountered by the
last outgoing packet. (The counter is reset at the start of
transmitting each new packet.)