P89C61X2 signature doesnt match.

[prahlad]

Dear Andy,

I have been using flash magic for programming V51RD2, C668, C699 & LPC9xx for nearly two years.  Recently i started using P89C61X2 flash magic does establish the connection and reads the device signature as 0x15 0xC2 0x82 When i try to program it says signature doesnt match with expected value.  I have tried changing ICs several times but the same signature is read all the time.  I checked up with P89C61X2 datasheet the signature given in datasheet is 0x15 0xC2 0xF0.  The device ID 2 seems to be diffrent.  What could be wrong.  I am using no handshaking signals for programming only RX TX.

Thanks & Regards,
Prahlad Purohit

[Andy Ayre]

I checked in the code and for the 89C61X2 there is: {0x15, 0xC2, 0xF0}
and for the 89C51RD2xx there is: {0x15, 0xC2, 0x82}

So it seems the wrong device signature is being read out of the device. I'm not sure why this is happening. As a workaround you can disable signature checking in the advanced options.

[prahlad]

Dear Andy,

Thanks for your help it worked when i disabled that signature check option.  But why the signature is not matching with one in datasheet is still a mystry.  Today i checked over 50 devices and signature read is same.

Regards,
Prahlad Purohit

[erikm]

this is not a Philips experience, but once I got 1000 chips that read as a 'better' variant.  We checked and they were, indeed, the 'better' variant (twice as much flash) evidently the manufacturer had relabeled the chips to overcome a shortage.

if, indeed, the 89C51RD2 is a superset of the P89C61X2 thais may be what happened.

Erik

[Andy Ayre]

My only suggestion is to contact Philips. FM simply reports what the device gives it for the signatures.