Advantech RISC SOM-A2558 - Manual (Page 36)

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User’s Manual for Advantech SOM-A2558 series module V1.00
36
Reserved)
A38 N.C. - N.C. just float this pin. -
B39 N.C. - N.C. just float this pin. -
A39 N.C. - N.C. just float this pin. -
B40 N.C. - N.C. just float this pin. -
A40 N.C. - N.C. just float this pin. -
B41 N.C. - N.C. just float this pin. -
A41 N.C. - N.C. just float this pin. -
B42 N.C. - N.C. just float this pin. -
A42 N.C. - N.C. just float this pin. -
B43 N.C. - N.C. just float this pin. -
A43 N.C. - N.C. just float this pin. -
B44 N.C. - N.C. just float this pin. -
A44 N.C. - N.C. just float this pin. -
B45 N.C. - N.C. just float this pin. -
A45 N.C. - N.C. just float this pin. -
B46 N.C. - N.C. just float this pin. -
A46 N.C. - N.C. just float this pin. -
B47 N.C. - N.C. just float this pin. -
A47 N.C. - N.C. just float this pin. -
B48 N.C. - N.C. just float this pin. -
A48 N.C. - N.C. just float this pin. -
B49 N.C. - N.C. just float this pin. -
A49 GND P Ground -
B50 N.C. - N.C. just float this pin. -
A50 N.C. - N.C. just float this pin. -
2.2 function description
2.2.1 System Bus
System Bus includes PXA255 address bus, data bus, memory control
signals and GPIOs.
System Bus enters CSB by X1. In order to make sure that system bus
signals have perfect electrical waves, System Bus signals are driven by buffers
to enhance signals performance.
The buffers signals direction control is control by CPLD on SOM-A255x
module.