TF536 no RAM detected

[ninjafahrer]

I am one step further now... was checking all the PINs at the cpld and found one that was bad...

Now the memory is detected, but in 5 ranges 8MB, 16MB, 16MB, 16MB, 8MB.

The quick memtest run without errors.

[terriblefire]

I am one step further now... was checking all the PINs at the cpld and found one that was bad...

Now the memory is detected, but in 5 ranges 8MB, 16MB, 16MB, 16MB, 8MB.

The quick memtest run without errors.

two of the address pins are shorted somewhere. Do you have the OBV file and open board viewer?

[ninjafahrer]

I have open board viewer, but nno OBV file.

[ninjafahrer]

to be more precise on the memory detection:

8MB 40000000-407fffff
16mb 4080fffc-4180fffb
16mb 4181fff8-4281fff7
16mb 4282fff4-4382fff3
8mb 4383fff0-4403ffef

[terriblefire]

to be more precise on the memory detection:

8MB 40000000-407fffff
16mb 4080fffc-4180fffb
16mb 4181fff8-4281fff7
16mb 4282fff4-4382fff3
8mb 4383fff0-4403ffef

OBV FIle.. .works for me with openboardview-8.0.exe (included)

tf536r2_gnd_is_a3.zip

(1.28 MiB) Downloaded 101 times

sounds to me like an issue with A23 or A24 being shorted together? or maybe the BA0 and BA1 pins?

[ninjafahrer]

I ve checked A23 & A24 and in a second test BA0 and BA1 pins. All ok, no shortage.

[terriblefire]

Other possibility is that A24-A27 are badly connected between the CPU and the CPLD.

[ninjafahrer]

That was the missing bit, even that the Multimeter showed that everything is ok resoldering made it finally work!

Thanks TF for your outstanding support!

Another 2 AMIGAS got saved for the world - accelerated!!!

[terriblefire]

Excellent! good work.