Datasheet for the part numbered SM8521, 370 KB in PDF form; the file name does not identify the manufacturer or the function, so open the document to confirm what device it covers. A sheet of this size usually includes a block diagram, pin descriptions, electrical characteristics and timing data. Repair technicians use such references to identify supply, clock and reset pins, measure them on the board and decide whether the chip itself has failed. Check the full marking on the IC matches SM8521 before relying on the pinout.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @datasheet_technar_org. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.