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 [MMC 417] Pri CRC4 Option
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 This option is used to enable/disable 
 CRC4 generation and checking.  

 It is useful with some networks which
 do not support CRC4 framing but only
 PCM30 framing.
 
 ** DEFAULT : CRC4 ON
 ** Related Items
    MMC 418 CARD Restart     
 
