topic Re: KSZ8041 PHY Chip for the MCF52259 in ColdFire/68K Microcontrollers and Processors

KSZ8041 PHY Chip for the MCF52259

ND — Tue, 27 Jan 2009 00:14:06 GMT

Hi,
I have on order MCF52259 processors and also ordered KSZ8041 PHY as in the demo kit. The demo kit has the KSZ8041NL , but I can only get the KSZ8041TLI part. The only difference I can see is that the TLI part also does SMII interface, package type, and about £1 more expensive. I have never used a PHY chip before, but can anyone tell me if there would be a problem using this one?

Thanks
Neil

Re: KSZ8041 PHY Chip for the MCF52259

Flaviohpo — Thu, 21 Jan 2010 21:05:37 GMT

I have the same question, but I also would like to know some alternatives to the KSZ8041NL that is not QFN package. Thanks.

Re: KSZ8041 PHY Chip for the MCF52259

HLaidet — Fri, 22 Jan 2010 03:49:06 GMT

Hello,

I used a KSZ8041TL connected to a MCF52259 because TQFP package is easier to solder.

It runs with the same software the DEMO board.

The only problem i had (lost link sometimes) was the capacitors on quartz too low (18pF increased to 33pF).

No other problems.

Regards,

Henri

Re: KSZ8041 PHY Chip for the MCF52259

Flaviohpo — Sat, 23 Jan 2010 04:56:37 GMT

what do you mean with:

"The only problem i had (lost link sometimes) was the capacitors on quartz too low (18pF increased to 33pF)."

did u use an independent crystal for the CI? whats frequency? 25MHz?

Re: KSZ8041 PHY Chip for the MCF52259

HLaidet — Mon, 25 Jan 2010 20:49:07 GMT

i use the basic schematic with a crystal 25MHz(Fundamental)+1M resistor and two 18pF capacitors ( like the schematic of M52259DEMO board ).

the quartz is: CITIZEN HCM49 25.000MABJ-UT

because it is the first time i use a PHY, then i did a test endurance.

that's when i found errors ethernet.

by putting traps, i have found losses of LINK (status register, bit LINK STATUS).

to get everything correct, i had to increase the 18pF capacitors on quartz.

now the test is done without errors (several hours).

Henri