HD6417618 RENESAS [Renesas Technology Corp], HD6417618 Datasheet - Page 288
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HD6417618
Manufacturer Part Number
HD6417618
Description
32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7618 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417618.pdf
(646 pages)
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Section 11 Ethernet Controller (EtherC)
11.4.6
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.
11.4.7
The EtherC supports flow control functions conforming to IEEE802.3x in full-duplex operations.
Flow control can be applied to both receive and transmit operations. The methods for transmitting
PAUSE frames when controlling flow are as follows:
Automatic PAUSE Frame Transmission: For receive frames, PAUSE frames are automatically
transmitted when the number of data in the receive FIFO (included in E-DMAC) reaches the value
set in the flow control FIFO threshold register (FCFTR) of the E-DMAC. The TIME parameter
included in the PAUSE frame at this time is set by the automatic PAUSE frame setting register
(APR). The automatic PAUSE frame transmission is repeated until the number of data in the
receive FIFO becomes less than the FCFTR setting as the receive data is read from the FIFO.
The upper limit of the number of retransfers of the PAUSE frame can also be set by the automatic
PAUSE frame retransfer count set register (TPAUSER). In this case, PAUSE frame transmission
is repeated until the number of data becomes FCFTR value set or below, or the number of
transmits reaches the value set by TPAUSER. The automatic PAUSE frame transmission is
enabled when the TXF bit in the EtherC mode register (ECMR) is 1.
Rev. 6.00 Jun. 12, 2007 Page 256 of 610
REJ09B0131-0600
(short IPG)
(long IPG)
Case A
Case B
Operation by IPG Setting
Flow Control
Note: * IPG may be longer than the set value, depending on the state of the circuit and the system bus.
Packet
Figure 11.7 Changing IPG and Transmission Efficiency
[1]
[1]
IPG*
[2]
[2]
[3]
[3]
[4]
[4]
[5]
......
......
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