I am curious. I have seen a lot of posts here about Atmel ARM chips and even the small Philips ARM chip, but I have not seen much if anything about the OKI line of ARM MCUs.
Are people not aware of them, or do they just not think much of them. The ML67Q4003 and ML67Q5003 are cheap, effective and come in some small packages. Unlike the Philips chip they have an external bus. Is no one using the OKI parts? What is wrong with them?
-- Rick "rickman" Collins rick.collins@XYarius.com Ignore the reply address. To email me use the above address with the XY removed. Arius - A Signal Processing Solutions Company Specializing in DSP and FPGA design URL http://www.arius.com 4 King Ave 301-682-7772 Voice Frederick, MD 21701-3110 301-682-7666 FAX
Technically you're maybe right but the japanese business model is for big firms, not for a small manufacturer! I had personal problems several times I used "japanese only" chips. I think if you want buying a CPU do not use japs. Try US or European.
- Henry
rickman schrieb in Nachricht ...
I hear what you are saying. I am not getting great support since I have to use the local rep who writes his FAE who contacts factory support who gets the developer... you get the idea. I once got an email back that had been forwarded some 8 or more times. It was hard to even figure out who sent what to whom.
But I am getting good support from the local people. They have gotten me a good price and I expect to see a development board in about a month. The bottom line is that there are no alternatives for this chip at the moment. The Philips chips don't have an external bus, the Micronas chips use a fat package, TI does not acknowlege they even make an ARM CPU unless you are building automobiles and everyone else making them *is* Japaneese or other asian. So what is the alternative?
Henry wrote:
-- Rick "rickman" Collins rick.collins@XYarius.com Ignore the reply address. To email me use the above address with the XY removed. Arius - A Signal Processing Solutions Company Specializing in DSP and FPGA design URL http://www.arius.com 4 King Ave 301-682-7772 Voice Frederick, MD 21701-3110 301-682-7666 FAX
and
small
one
Don't know.
Memec seem to be pushing them heavily.
Sharp chips seem quite popular. Sharp also provides an recent version of = gcc for download once you have registered.
Have philips just seem to becoming available for sale. Distributors here only seem to have samples.
cheapest boards with Sharp arms I've come across so far are :
marmalade US$299 with 7.8" touch screen
revealy $199
Anyone else spotted cheap ones ?
Alex Gibson
That's right! The TI parts is the TMS470, for example used by Bosch (car electronics). I will use the LPC210x. I never had problems with Philips. In fact, I think Philips is the only manufacturer stayed in the old business model after all the semiconductor industry changed mine. I like the old model just I liked Motorola 68k before they went to "DNA" (shit can think??). It's a mystery why Philips omitted the external bus interface. A 32kHz clock PLL is also missing. Maybe they want selling future or custom devices I'm not aware of ??? I like the i2c bus for connecting all the stuff on the pcb. Even the LPC210x is interchangable because I run a virtual machine on the ARM... (I learned my lessions).
Cheers - Henry
rickman schrieb in Nachricht ...
times I
What about Atmel?
Leon
The BUS issue is simply a pin-count one. Their first release is right into the uC space, which is new for the ARM core, but Philips are talking about 64 and 144 pin package models, so as that firms up, I'm sure external BUS options will appear. There are other benefits of on-chip FLASH : in the LPC21xx I think they have a 128bit FLASH interface, so can get MUCH higher memory bandwiwth than an external 16 bit wide FLASH part - and you'll fine FLASH speed is the bottleneck these days. External DATA BUS makes sense for peripherals, like Ethernet controllers...
-jg
Hmm. For a mux bus we need about a dozen pins. It would be possible with 44 pins case. Even a Ethernet controller is available for connecting via i2c.
- Henry
Jim Granville schrieb >>
In
clock
pcb.
Try DIL40 board for $107
- Henry
Alex Gibson schrieb in Nachricht ...
Don't know.
Memec seem to be pushing them heavily.
Sharp chips seem quite popular. Sharp also provides an recent version of gcc for download once you have registered.
Have philips just seem to becoming available for sale. Distributors here only seem to have samples.
cheapest boards with Sharp arms I've come across so far are :
marmalade US$299 with 7.8" touch screen
revealy $199
Anyone else spotted cheap ones ?
Alex Gibson
screen controller,
SDRAM, 75 Mhz LH79520.
MultimediaCard slot.
I have seen the Sharp parts, but they are not complete since they don't have on chip flash. Originally I had picked the Atmel 55x800 or something similar. But I wanted the chip to boot without external flash since it is the boot monitor on this board. I want it to run with a minimum of stuff being right. OKI is the only part that is complete (RAM, Flash, peripherals) and has an external bus and comes in a small package AFAIK.
-- Rick "rickman" Collins rick.collins@XYarius.com Ignore the reply address. To email me use the above address with the XY removed. Arius - A Signal Processing Solutions Company Specializing in DSP and FPGA design URL http://www.arius.com 4 King Ave 301-682-7772 Voice Frederick, MD 21701-3110 301-682-7666 FAX
The dropped the external bus so it would fit in a tiny package.
What virtual machine do you run?
Henry wrote:
-- Rick "rickman" Collins rick.collins@XYarius.com Ignore the reply address. To email me use the above address with the XY removed. Arius - A Signal Processing Solutions Company Specializing in DSP and FPGA design URL http://www.arius.com 4 King Ave 301-682-7772 Voice Frederick, MD 21701-3110 301-682-7666 FAX
I am pretty sure I discussed my part selection process here about 4-6 months ago. The Atmel 55800 was my first choice because of the great peripherals it had. But the flash is external. Even on the chips with builtin flash the flash is a second chip and a flaw on the external bus can prevent them from booting up. This is the boot monitor and board controller. If it does not come up, the board can't tell you what is wrong. With the OKI ARM chip it only has to have clock, power and reset to come up and start looking at the board. I plan to use this in production to test the boards.
-- Rick "rickman" Collins rick.collins@XYarius.com Ignore the reply address. To email me use the above address with the XY removed. Arius - A Signal Processing Solutions Company Specializing in DSP and FPGA design URL http://www.arius.com 4 King Ave 301-682-7772 Voice Frederick, MD 21701-3110 301-682-7666 FAX
touch
meg
smaller
What about with a similar feature set to the boards I mentioned before ?
arm, vga or lcd out, ethernet, rs232 or 422 or 485, parallel, flash or = smart media card ?
I'm not sure about my further software (Tinyboot, Avise, etc). Something like Forth ...
- Henry
rickman schrieb in Nachricht ...
In
clock
pcb.
big
and
small
one
XY
Never heared of one. Is it really a complete ethernet controller or do you mean a doughter board with separate uC and ethernet?
It is an Ethernet controller but needs the PHY transceiver IC extra. If you really need the type I will see on my harddisk (My brain cannot be upgraded with a bigger disk :) Please trigger me with private email...
BTW: CS8900 is an Ethernet controller with integrated PHY for 10MBit only.
- Henry
Erik Hermann schrieb >> Even a Ethernet controller is available for connecting via i2c.
Hi Rick,
The newer AT91RM9200 has a built in ROM boot, so you can have a second level boot on parallel flash (8/16 bit), serial EEPROM or serial flash, and if no valid flash image is around, you can download a 13 kB app into internal SRAM using Xmodem/UART or USB Device Firmware upgrade.
The packages are 208 TQFP and BGA256, so they are not the smallest you have seen.
-- Best Regards Ulf at atmel dot com These comments are intended to be my own opinion and they may, or may not be shared by my employer, Atmel Sweden.
Thanks, but that is not the same thing. The real problem is that with the Atmel ARM parts that have internal flash, a board level defect that corrupts the external bus also corrupts the flash bus since they are the same thing. That gives me a much higher chance that the board will not boot.
-- Rick "rickman" Collins rick.collins@XYarius.com Ignore the reply address. To email me use the above address with the XY removed. Arius - A Signal Processing Solutions Company Specializing in DSP and FPGA design URL http://www.arius.com 4 King Ave 301-682-7772 Voice Frederick, MD 21701-3110 301-682-7666 FAX
Boggle!
You're serious?
No kidding. One of advantages I see in parts w/ internal flash and RAM is that you don't need ICE or JTAG to get a board up and running.
--
Grant Edwards grante Yow! Is this BOISE??
at
visi.com
But Atmel uses two die on their ARM parts with flash. They are both pinned to the same pads on the package. So if you short a address or data pin it affects the connection to the flash just as if they were in two separate packages. Not a problem for most designs, but for this one I want the processor to boot with the highest likelyhood I can reasonably get. (of course there is no small amount of circuitry to get the power and clock up... but who's counting?)
-- Rick "rickman" Collins rick.collins@XYarius.com Ignore the reply address. To email me use the above address with the XY removed. Arius - A Signal Processing Solutions Company Specializing in DSP and FPGA design URL http://www.arius.com 4 King Ave 301-682-7772 Voice Frederick, MD 21701-3110 301-682-7666 FAX
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