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DM8148 package/pin question

Bryan Busacco
Expert 1215 points

7142.DM8148 pins.docI’m using the following footprint for the processor ( refer to attachment ).

 According to the above package the following pins are missing (I counted 100):

 

C7,

C10,

C13,

C16,

C19,

C22,

 

 

D4,

D7,

D10,

D13,

D16,

D19,

D22,

D25,

E5,

E7,

E10,

E13,

E16,

E19,

E22,

E24,

F6,

F23,

 

 

 

 

 

 

G3,

G4,

G5,

G7,

G22,

G24,

G25,

G26,

J8,

J9,

J20,

J21,

 

 

 

 

K3,

K4,

K5,

K8,

K21,

K24,

K25,

K26,

N3,

N4,

N5,

N24,

N25,

N26,

 

 

T3,

T4,

T5,

T24,

T25,

T26,

 

 

W3,

W4,

W5,

W8,

W21,

W24,

W25,

W26,

Y8,

Y9,

Y20,

Y21,

 

 

 

 

AB3,

AB4,

AB5,

AB8,

AB21,

AB24,

AB25,

AB26,

AC6,

AC23,

 

 

 

 

 

 

AD5,

AD7,

AD10,

AD13,

AD16,

AD19,

AD22,

AD24,

AE4,

AE7,

AE10,

AE13,

AE16,

AE19,

AE22,

AE25,

AF7,

AF10,

AF13,

AF16,

AF19,

AF22

 

 

 

Please confirm.

 

The Mistral DM8148 EVAL board has tied about 28 of these non-existing pins to either power or ground.  They are pins C7, C10, C13, C16, C19, C22, D4, D25, G3, G26, K3, K26, N3, N26, T3, T26, W3, W26, AB3, AB26, AE4, AE25, AF7, AF10, AF13, AF16, AF19, and AF22!!

 Are they using a different package from the one I attached?  Or there are some other reasons for doing so?!

  • 0
    TI__Genius 15310 points

    Bryan,

    The data sheet should always supersede the EVM design.  Please check our DS.

    BR,

    Viet

  • 0 in reply to Viet Dinh
    Expert 1215 points

    Did the DM8148 come in a different package, perhaps as a TMX device, or some form of early silicon?  We see that the ONLY package is the  684 BGA in the datasheet and will design accordingly, however we do see reference to about 100 pins, with Pin names, that are not on this package?

    Thanks,

    Bryan Busacco.

  • 0 in reply to Bryan Busacco
    TI__Genius 15310 points

    Bryan,

    We only offer the 684 CYE.  Those pins were for an internal test device. 

    Sorry for confusion.  We will mention it in DS in next release.

    BR,

    Viet

  • 0 in reply to Viet Dinh
    TI__Genius 15310 points

    Bryan,

    After we consulted with our device designer and EVM designer, we found out there is a problem with the old EVM schematic.  The EVM was designed to be compatible with our device and some other test device that doesn’t exist, that’s what the extra PADS are for on the EVM.  The latest EVM schematics and layout were updated a very long time ago removing the contingency pwr/gnd pins.

    Sorry for the mistake earlier and please go with the DS, not EVM for your design.

    BR,

    Viet