format  void STM_UnsetAlias ​​(StmHn alias)
 Input  alias: alias stream handle
 Output  None
 Function value  None
 Function  Cancels the alias set for the stream.
 Remarks  This function is used to cancel the alias set with STM_SetAlias. 

  format  void STM_SetTrBuf (StmHn stm, void * buffer, Sint32 nunit,
 Sint32 unitsize)
 Input  stm: Stream handle
:  buffer: Transfer area
:  nunit: Size of transfer area (unit of transfer unit)
 unit  unitsize: Transfer unit size
 Output  None
 Function value  None
 Function  Sets the data transfer area for the specified stream. 

(1) Transfer unit size

constant name	transfer unit size
STM_UNIT_FORM1	Mode1, Mode2 Form1 sector length (2048 bytes)
STM_UNIT_FORM2	Mode2, Form2 sector length (2324 bytes)
STM_UNIT_WORD	word unit (2 bytes)
STM_UNIT_BYTE	byte unit (1 byte)

  Remarks  (a) The default transfer mode is CPU.
:  (b) If a transfer function is set, the transfer function has priority.
:  (c) For software transfers and CPU DMA transfers, the transfer area is at a longword boundary.
Please place  .