Format  Sint32 CDC_DataEnd (Sint32 * cdwnum)
 Input  None
 Output  cdwnum: Number of transfer words of CD block
 Function value  Returns an error code.
 Function  Instructs the CD block to end data transfer. It is also possible to cancel data transfer in the middle
 . 

  (1) CD block transfer word count  

∙ Returns the number of valid data words transferred by the CD block. Regular word count (all words to be transferred
Number).
In case of an error, the number of transfer words is as follows. 

constant name	description
CDC_DEND_ERR	An error occurred during data transfer. The end of data transfer was executed even though it was not during data transfer.

  (2) Relationship of transfer word count  

The number of words transferred by the host (the number of words transferred by the host before the end of data transfer) and CD
The data transfer status can be checked by comparing the block transfer word count. 

Transfer status	Host transfer word count (Host word count)	CD block transfer word count (cdwnum)
		Ejecting (CD → Host)	Writing (Host → CD)
Transfer interruption	Host word count	cdwnum> number of host words	cdwnum = number of host words
All transfers	Number of host words = number of regular words	cdwnum = Regular word count = Host word count
Over transfer	Number of host words> Number of regular words	cdwnum = Regular word count

-Transfer interruption: Data transfer is canceled halfway>
・ All transfer: Transfer all data
・ Excess transfer: Transfer exceeding the normal number of words (Dummy data is transferred if the limit is exceeded)  

 Remarks  The DRDY flag is cleared inside the function after issuing the command.