Sep 26, 2022
07:07 PM
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Sep 26, 2022
07:07 PM
Hello
Recently we have been using the TC397 to test the Ethernet transmission speed.
We use the LWIP stack, Transmission using TCP.
But the speed we tested was only about 200Mb/s, not 1000Mb/s.
3 Replies
Sep 26, 2022
08:48 PM
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Sep 26, 2022
08:48 PM
Hi huskie,
According to datasheet of RTL8211F(I)-CG
The 8-bit-wide data is recovered and is sent to the RGMII interface at a clock speed of 125MHz
Please check if 125MHz is used.
And the stack may limit the speed also.
dw
Sep 27, 2022
02:07 AM
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Sep 27, 2022
02:07 AM
Hi
RTL8211 link speed is 1000M
but RTL8211 CLKOUT pin is only 25Mhz.
Sep 27, 2022
03:38 AM
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Sep 27, 2022
03:38 AM
Hi huskie,
Please see this chapter:
7.11.1.RGMII
Among the RGMII interface in 100Base-TX and 10Base-T modes, TXC and RXC sources are 25MHz and 2.5MHz respectively; while in 1000Base-T mode, TXC and RXC sources are 125MHz. TXC will always be generated by the MAC and RXC will always be generated by the PHY.