DP8392 based 10Base-2 design issues

Erik Lins

Hello,

I need to provide a 10Base-2 ethernet connection in one of our devices, which normally only has 10/100Base-TX port. We have addon connectors, which provide SPI, I2C, etc. as well as USB interfaces and designed an addon port based on AX88772C USB ethernet controller and added an optical transceiver to provide an optical interface to a customer. My idea no was to keep the AX88772C design, set it to 10MBits and more or less simply add the DP8392 instead of the optical transceiver. But the AX88772C does only provide TX+/- and RX+/- diff. pairs and no collision detecd CD+/- input.

What would the best way to implement that USB->10Base-2 story? If the AX88772C is not suitable, can you recommend some device? An existing (embedded) Linux driver would be great.

Thank you and best regards,

ER!K

over 9 years ago

0 Patrick OFarrell over 9 years ago

TI__Mastermind 31600 points

Erik,

We do not currently have any recommended products in our Ethernet portfolio that support 10Base2.

Patrick

0 Erik Lins over 9 years ago in reply to Patrick OFarrell

Prodigy 30 points

Hello Patrick,

as far as I can see, the DP8392 is a 10Base-2 (coaxial) transceiver. First bullet point in data sheet: "Compatible with Ethernet II, IEEE 802.3 10Base5 and 10Base2".

ER!K

0 Patrick OFarrell over 9 years ago in reply to Erik Lins

TI__Mastermind 31600 points

Erik,

You are correct. However, the DP8392 is obsolete. None of our current Ethernet products support 10Base2.

Patrick

0 Erik Lins over 9 years ago in reply to Patrick OFarrell

Prodigy 30 points

Hello Patrick,

anyway... still didn't answer my question. ;-)

In this special case I won't actually care about being obsolete. I only need to produce few boards one one specific project. I would purchase enough plus some spare parts at a distributor (some have stock, I already checked) and would be done. So, please comment on my question concerning usage in conjunction with the AX88772C or maybe you can suggest some other ethernet controller from an existing design or some old application note.

Thank you and best regards,
ER!K

0 Patrick OFarrell over 9 years ago in reply to Erik Lins

TI__Mastermind 31600 points

Based on a quick look at the AX88772C, it appears to support a 10/100 Ethernet PHY output. This would not work as a connection to the DP8392 differential pairs. The signaling is completely different.

I don't have a good alternative to the AX88772C. The DP8392 is one piece of a chip set. The old application notes of which I am aware relate to interconnection between the devices from the chip set.

Patrick

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DP8392 based 10Base-2 design issues