[sdiy] help with uQ repair

[Terry Shultz]

Hello All,

The DSP56362 Motorola DSP does have P, X, and Y memory

On-Chip Memories
— Modified Harvard architecture allows simultaneous access to program and data memories — 30720 x 24-bit on-chip program ROM1 (disabled in 16-bit compatibility mode)
— 6144 x 24-bit on-chip X-data ROM1
— 6144 x 24-bit on-chip Y-data ROM1
— Program RAM, instruction cache, X data RAM, and Y data RAM sizes are programmable

Instruction Cache

Disabled Enabled Disabled Enabled

Switch Mode

Disabled Disabled Enabled Enabled

Program RAM Size

3072 × 24-bit 2048 × 24-bit 5120 × 24-bit 4096 × 24-bit

Instruction Cache Size

0
1024 × 24-bit 0
1024 × 24-bit

X Data RAM Size

5632 × 24-bit 5632 × 24-bit 5632 × 24-bit 5632 × 24-bit

Y Data RAM Size

5632 × 24-bit 5632 × 24-bit 3584 × 24-bit 3584 × 24-bit

 
1.

— 192 x 24-bit bootstrap ROM (disabled in sixteen-bit compatibility mode)

Off-Chip Memory Expansion

—  Datamemoryexpansionto256Kx24-bitwordmemoryforP,X,andYmemoryusingSRAM.

—  Datamemoryexpansionto16Mx24-bitwordmemoryforP,X,andYmemoryusingDRAM.

—  Externalmemoryexpansionport(twenty-fourdatapinsforhighspeedexternalmemoryaccess allowing for a large number of external accesses per sample)

—  Chip select logic for glueless interface to SRAMs

—  On-chip DRAM controller for glueless interface to DRAMs



regards,



Terry 

> On Feb 23, 2017, at 7:17 AM, Julian Schmidt <elfenjunge at gmx.net> wrote:
> 
> I checked the 3.3V supply and it delivers stable 3.3V
> Xtal is running at 14.3MHz and the Clock IC is forwarding the clock to the DSP
> 
> I only worked with SHARC DSPs so far, but I guess the motorola DSP has no internal program memory and is bootet by the uC from flash and has its OS stored in the attached SRAM?
> 
> The rest of the PCB, especially around the DSPs looks pretty good. All sketchy looking parts where located to the left of the uC and the DSP is on its right side. Caps look good, too.
> 
> Here is a pic of the board.
> http://chipmusik.de/dump/uQ.jpg <http://chipmusik.de/dump/uQ.jpg>
> 
> I'm a bit concerned that the firmware update does not seem to work, as I guess the DSP should not be involved with that.
> Maybe an indication that it could be the flash indeed?
> 
> Any idea how to check the flash?
> 
> Julian
> 
> Am 23.02.2017 um 15:56 schrieb Christian Tecl:
>> Hello list - hello Julian....
>> I guess you already checked everything round that flip flop, resistors, diodes etc... To me there are also reasons to suggest a problem with power supply, maybe you check that also before soldering that dsp... And think about the possibility that it could be the flash, also. Like to hear what you are discovering. Greets Christian
>> -- 
>> Diese Nachricht wurde von meinem Android Mobiltelefon mit GMX Mail gesendet.
>> Am 23.02.2017, 15:24, Julian Schmidt <elfenjunge at gmx.net> <mailto:elfenjunge at gmx.net> schrieb:
>> I have a broken microQ in the workshop right now.
>> It arrived with a scrambled LCD that only showed garbage.
>> 
>> after opening it up I saw someone butcher the D-Flipflop (bend and
>> shorted pins)
>> after replacing it the unit boots again, waldorf welcome screen, os2.2,
>> then preset name.
>> 
>> yay!
>> 
>> bad news is the unit immediately freezes. No buttons and encoders do
>> something. :(
>> 
>> I tried the firmware update but on reveiving the sysex data the power
>> button makes a quick flash, 4 or 5 vertical bars appear in the LCD and
>> then nothing happens. Pingpong chaselight on the Inst. 1-4 LEDs and the
>> message "please play back dump" or something like that in the screen.
>> 
>> In factory test mode all buttons, LEDs and encoders work.
>> Audio out test does not work (silence on all outs)
>> and the DSP test fails.
>> it only shows:
>> 
>> 1:----- 2:----- 3:sig!
>> 
>> and repeatedly flashes "DSP REBOOT" every second.
>> 
>> So my guess is that I have a broken DSP.
>> 
>> Is it worth it to try and replace the DSP? they are still in stock at
>> digikey.
>> But I am open for other ideas since I'm not keen on desoldering the LQFP144.
>> 
>> Best,
>> Julian
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