SH7713 Datasheet, PDF (706/904 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

Section 18 Ethernet Controller (EtherC)
18.4.6 Operation by IPG Setting
The EtherC has a function to change the non-transmission period IPG (Inter Packet Gap) between
transmit frames. By changing the set values of the IPG setting register (IPGR), the transmission
efficiency can be raised and lowered from the standard value. IPG settings are prescribed in
IEEE802.3 standards. When changing settings, adequately check that the respective devices can
operate smoothly on the same network.
Case A
(short IPG)
[1]
[2]
[3]
[4]
[5]
......
Packet IPG*
Case B
(long IPG)
[1]
[2]
[3]
[4]
......
Note: * IPG may be longer than the set value, depending on the state of the line and the system bus.
Figure 18.7 Changing IPG and Transmission Efficiency
Rev.1.50 Aug. 30, 2006 Page 666 of 860
REJ09B0288-0150