System and method for automatic retry of transmit, independent o

Details System and method for automatic retry of transmit, independent o System and method for automatic retry of transmit, independent o

1997-12-02

2000-10-24

Olms, Douglas W.

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

370445, H04L 1228, H04L 1256

Patent

active

061378046

ABSTRACT:
In a local area network, a system and a method to detect transmit underruns and retransmit frames between a sending station and a receiving station using a Media Access Control (MAC) device in lieu of a sending processor. The MAC device includes a MAC processor for transmitting data in blocks from a host buffer to a storage device, e.g., RAM for retransmission to the network via a Media Independent Interface (MII) unit. The MAC device includes a transmit logic unit which uses a control word set by the MAC processor to transmit data by frames from the storage device to the network. The transmit logic unit includes pointer control logic to identify the start address of the data and to track the data as read from the storage device to the network. When a transmit underrun occurs, the transmit logic recognizes the condition and resets the pointer logic to the start of the first frame for retransmission to the receiving station. During retransmission, the MAC processor continues to transfer data from the sending system to the storage device which eventually provides sufficient data to overcome the underrun condition. A frame is repeated if a underrun condition continues until the frame is transmitted without an underrun condition which eliminates the retransmission request of the receiving station to the sending station. The MAC device enables underruns to be transparent to the sending and receiving station.

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