Been looking for an arm with ethernet and i2c. Specifically the 1Mbit/sec fm+ i2c spec. It seems there are quite a few slave devices that support fm+ but I haven’t seen a processor that can keep up with that speed. I’d prefer arm but I’d take almost anything at this point. Maybe someone else has had more luck. I’d even take a ttl serial to i2c master chip if it supported fm+.
Basically I just need to pipe data from ethernet to two 12c buses at 1Mbit speeds.
Looking at datasheets and I remembered this post. LPC17xx devices have both Ethernet and I2C FM+ support.
I use a WizNet 812MJ for ethernet; SPI interface. No TCP/IP needed in the ARM. Huge simplificationphishinphree:
Been looking for an arm with ethernet and i2c. Specifically the 1Mbit/sec fm+ i2c spec. It seems there are quite a few slave devices that support fm+ but I haven’t seen a processor that can keep up with that speed. I’d prefer arm but I’d take almost anything at this point. Maybe someone else has had more luck. I’d even take a ttl serial to i2c master chip if it supported fm+.Basically I just need to pipe data from ethernet to two 12c buses at 1Mbit speeds.
For pure speed a Wiznet W5300 would be a better choice, the only issue is that it’s parallel interface only, so you need a certain amount of I/O available. I think the minimum is 11 i/o pins for the interface and that’s kinda kludgy. Best is to use the full parallel interface.
the '5300 is a chip. I was speaking of plug and play modules complete with RJ45. 812MJ enables SPI, low pin count. On AVRs, I'm using 4Mbps SPITheDirty:
For pure speed a Wiznet W5300 would be a better choice, the only issue is that it’s parallel interface only, so you need a certain amount of I/O available. I think the minimum is 11 i/o pins for the interface and that’s kinda kludgy. Best is to use the full parallel interface.
stevech:
the '5300 is a chip. I was speaking of plug and play modules complete with RJ45. 812MJ enables SPI, low pin count. On AVRs, I’m using 4Mbps SPI
Yes, you were speaking of a module and I was speaking of a chip…and?
If it helps I’ll reference a module as well, the WIZ830MJ. There ya go.
TheDirty:
stevech:
the '5300 is a chip. I was speaking of plug and play modules complete with RJ45. 812MJ enables SPI, low pin count. On AVRs, I’m using 4Mbps SPIYes, you were speaking of a module and I was speaking of a chip…and?
If it helps I’ll reference a module as well, the WIZ830MJ. There ya go.
Chips - too hard for one-of or low volume. that’s merely the point. Nothing more.
I’ve worked with both the W5100 and W5300 in chip form on one off designs, I would disagree about the difficulty, but ya, if you’re just making an ad-hoc tool then the module is a useful time saver that’s well worth the price.
Chips - for one-of, too hard for old fart like me to solder. then a lotta wires, the RJ45 magnetics, the LEDs, blah blah.TheDirty:
I’ve worked with both the W5100 and W5300 in chip form on one off designs, I would disagree about the difficulty, but ya, if you’re just making an ad-hoc tool then the module is a useful time saver that’s well worth the price.