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The data buffer is used to hold data packets temporarily prior to transmission on the network and as a temporary storage of all received data packets directed to the particular node. The 2-kbyte RAM buffer allows both transmit and receive operations to be double buffered with respect to the processor (VMEbus master). For instance, after one data packet has been loaded into a particular page within the data buffer and a transmit command for that page has been issued, the processor can start loading another page with the next message. Similarly, after one message is received and completely loaded into one page of the RAM buffer by the COM9026, another receive command can be issued to allow reception of the next packet while the first packet is read by the processor.
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