Which ARM processor to use...

Some (most) of LPC177x do have Ethernet.

ST's STM32F107 line of CM3s will run 72 MHz and have (among other stuff, of course) embedded Ethernet MACs with DMA support. Haven't played with the 107-series but have used the 103 in several recent projects. Nice chips.

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I saw that too. Strangely enough the ethernet interface is not listed in the parametric search window on the NXP site. But it is in the general description..

Meindert

TI's Stellaris line has Ethernet (and a version with built in phy), NXP LPC1758, 1768 and 1769 all have Ethernet. The 1768 is 100Mhz the 69 120mhz ST has a line with Ethernet. They are all right there on their web sites.

They are probably all around 30Mhz running from flash. That's the current process limit.

with several wait states.

I second that. Personally used only the F100 series, but the F200 are used in other projects in my company. The documentation is good, there are many inexpensive development boards, and the combination STM32 + Segger J-Link + IAR, (my employer's weapon of choice,) works well.

-- Roberto Waltman

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If you don't mind a MIPS core, PIC32MX7XX has ethernet as well. I don't really care about the core, but just poking fun as people saying ARM are forever. You can run the PIC32 at 210MHz with 7 wait states. It will run at effective 30MHz in flash, but switch to 210MHz once relocated to sram. At least, that the theory. In practice, i only heard of 160MHz.

NXP uses 128-bit wide FLASH and a "memory accelerator" (a simple RAM buffer) which helps.

-jm

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PIC32 also have internal wider bus (128 bits or more), instruction cache and 5 stage pre-fetch pipeline. I guess almost everybody is doing the same.

Has Freescale even gotten on the ARM bandwagon? If they did, they'd have an ARM-QUICC (or whatever) with a bazzilion interfaces including at least one Ethernet.

(It's been years since I've even looked at the Freescale website -- presumably if they'd slid off the face of the earth I'd have read about it, but that's all I know).

ve

Yes, ARM M4 w/ DSP. Got USB, CAN, ethernet and whatever.

I like the PIC32 a lot, too. But I think Meindert already has an ARM toolset. That usually plays large in a decision like this.

Jon

They've got the Kinetis Cortex-M4 microcontrollers and the i.MX microprocessors.

-a

lash

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Actually, i have LMI, ST and NXP ARM boards/tools as well, but that doesn't stop me from jumping to PIC32 (per customer request). Just poking fun at people saying MIPS is dead.

Who doesn't ? ;) Yes, the

i.MX2** series, (ARM9) i.MX3** series, (ARM11) i.MX5** series, (Cortex-A8) i.MX6** series, (Cortex-A9, announced)

Didn't see anything as ugly as the QUICC in those processors but, paraphrasing Tolstoy, "every processor family is ugly in its own unique way."

-- Roberto Waltman

the

Ah. Given that it is from Microchip, it will never be dead. I think I can still get PIC16C54, today. Once they commit, they commit.

Jon

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On the contrary, PIC24FJ256DA206 (with graphics, but we are not using it yet) is no longer active on Digikey and disappearing from certain Microchip list. I think the microchip rep was trying to steer us away from this part as well. Hence, we are looking into PIC26 and PIC32. BTW, PIC26 (PIC24H) is 10% faster than PIC24 and with 12 bits A2D.

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Well, mostly. They occasionally have version-bumps that prevent re- use of existing compiled code. Cost of some of the old chips has gone up quite a bit, and availability (at least through distributors) is (perhaps understandably) not so good.

ve

remember looking at Freescale mac7xxx, arm7 aimed at automotive don't think they had ethernet, the real interesting thing about them was that they had 5V IOs but it looked like they only sold them to a few select customers

when I worked for Freescale we made several RF chips with an arm7 core

-Lasse