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Altera_Forum's avatar
Altera_Forum
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16 years ago

88e1111 loopback

hai all, i'm using ml505 board. when i tried to put the ethernet phy (marvel 88e1111) in loopback mode, its not happening. the data i sent through tx lines is not coming through rx lines. i follow...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

I also met the 88e1111 loopback problem. What i got is that the interface has already been able to ping out, but if I set it to loopback mode by

first, write 0x8000 to reset

second, write 0x6100 to force loopback.

but the PHY status register always indicate the link is down with value (0x7949).

the PHY control register is already (0x6100)

the bit 2 of the status register should be 1 after PHY set to loopback, right? what's the problem with what i met?