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sclk是做什么用的啊？

这是spi的时钟哇

请问为什么老是所不定呢？ 寄存器1F读出来的值是4E，

regA <=  X"00003C" when X"00",
         X"000099" when X"01",
--------PLL-----------
X"00107C" when X"02",---OK
X"001132" when X"03",--R LSB--OK
X"001200" when X"04",--R MSB--OK
X"001304" when X"05",--A --OK
X"00143A" when X"06",--B LSB--OK
X"001500" when X"07",--B MSB--OK
X"001606" when X"08",       --OK
---------------------------
X"001700" when X"09",--STATUS --STATUS-PIN--R
X"001BA0" when X"0A",--REFMON--
X"001C02" when X"0B",
-------------------------------------
X"00A000" when X"0C",
X"00A100" when X"0D",
X"00A200" when X"0E",
X"00A300" when X"0F",
X"00A400" when X"10",
X"00A500" when X"11",
X"00A600" when X"12",
X"00A700" when X"13",
X"00A800" when X"14",
X"00A901" when X"15",
X"00AA00" when X"16",
X"00AB00" when X"17",

X"00F008" when X"18",
X"00F108" when X"19",
  X"00F408" when X"1A",
X"00F508" when X"1B",

X"014042" when X"1C",
X"01414A" when X"1D",
X"014242" when X"1E",
X"014343" when X"1F",
------LVPEVL------------
X"019076" when X"20",
X"019100" when X"21",
X"019200" when X"22",

X"019676" when X"23",
X"019700" when X"24",
X"019800" when X"25",
-------LVDS/COMS-----------------
X"019921" when X"26",
X"019A00" when X"27",
X"019B10" when X"28",
X"019C00" when X"29",
X"019D00" when X"2A",

X"019E21" when X"2B",
X"019F00" when X"2C",
X"01A010" when X"2D",
X"01A100" when X"2E",
X"01A200" when X"2F",
--VCO CONFIG------------------------
X"01E000" when X"30",---Fvco divider-----4
X"01E102" when X"31",
X"023201" when X"32",
----------------------------------
X"001806" when X"33",--VCO cal now
X"023201" when X"34",
X"001807" when X"35",
X"023201" when X"36",