Cable OFF bit - When does it occur?
Ethernet Chips
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Ethernet Chips
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RE: Cable OFF bit - When does it occur?
by Eugeny ·
Look here, it says
Looks like this bit is about the connection between chip and transformer in standard RJ-45 configuration. This may be useful in direct connection in transformerless configuration. I suspect in this configuration chip can even see connectivity on the TX lines.
The only way to test this hypothesis is to disconnect chip and transformer or jack (if jack has internal transformer).
RE: RE: Cable OFF bit - When does it occur?
by Welocs ·
If so, wiznet would have named the bit “Transformer OFF” and not “CABLE OFF”, wouldn’t they?
I am (the chip) able of sensing the cable disconnected:
My design is made after reference design, which all include a transformer. (You don’t want to design without a transformer today, because customers would scream you to hell, because of all your network chips getting destroyed in a rough environment.)
RE: Cable OFF bit - When does it occur?
by Eugeny ·
Probably yes, bear in mind that WIZnet is Korean company, and it just can be Korean → English translation issue. Not only transformer can be connected to TX/RX lines, thus naming “transformer off” is also incorrect.