Networking Silicon — GD82559ER
All other activity is determined to be either data, link test pulses,
In 10 Mbps mode, the PHY unit can detect errors in the receive data. The following condition is considered an error:
The receive pair’s voltage level drops to the idle state during reception before the
Collision detection in 10 Mbps mode is indicated by simultaneous transmission and reception. If the PHY unit detects this condition, it asserts a collision indication to the CSMA/CD unit.
The link integrity in 10 Mbps works with link pulses. The PHY unit senses and differentiates those link pulses from fast link pulses and from
The PHY unit contains a jabber control function that inhibits transmission after a specified time window when enabled. In 10 Mbps mode, the jabber timer is set to a value between 26.2 ms and 39 ms. If the PHY unit detects continuous transmission that is greater than this time period, it prevents further transmissions from onto the wire until it detects that the MAC transmit enable signal has been inactive for at least 314 ms.
The PHY unit supports 10 Mbps full duplex by disabling the collision function, the squelch test, and the carrier sense transmit function. This allows the PHY unit to transmit and receive simultaneously, achieving up to 20 Mbps of network bandwidth. The configuration can be achieved through
The PHY unit supports
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