Skip to main content
Knowledgebase
Home
Renesas India - Knowledgebase

What is the padding insert function of E-DMAC and its advantage?

Latest Updated:03/23/2009

Question:

What is the padding insert function of E-DMAC (Ethernet Controller Direct Memory Access Controller)? What is its advantage?

Answer:

The padding is the data which compensates the shortage of the data when a given size of data should be constructed.
The data processing in the IP (Internet Protocol) layer is performed in the 4-byte boundary, but as MAC header long is 14-byte, the 2-byte padding should be inserted.

The Receive data padding insert function is the function to automatically insert the receive data padding by setting the padding size and padding areas to Receive Data Padding Insert Register (RPADIR).
This function allows to reduce the overhead when receiving the data and improve the receive performance compared with inserting the padding by software.

Suitable Products
SH7618