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How much data should be stored in built in FIFO in order to start EDMAC?

Latest Updated:03/24/2009

Question:

How much data should be stored in the built-in transmit/receive FIFO in order to start E-DMAC (Ethernet Controller Direct Memory Access Controller)?

Answer:

When transmitting: E-DMAC starts when 16 byte data is written to FIFO.
When receiving: E-DMAC starts when the following conditions are satisfied.

  1. The amount of data exceeds the number of bytes specified by Transmit FIFO Threshold Register(TFTR).

  2. Transmit FIFO is full

  3. 1-frame write is execut

Suitable Products
SH-Ether
SH7618
SH7616
SH7615